Dung Van Tran, Hau Thi Luong, Khanh Thi Pham, Thanh Trung Dang, Nhan Thai Hua, Hung Quoc Pham
The false clownfish (Amphiprion ocellaris) is a prominent species in the marine ornamental trade, valued for its vibrant orange-red coloration. However, aquaculture-bred individuals often exhibit less intense coloration than their wild counterparts, presenting a challenge for both breeders and aquarists. This study evaluates the effects of carotenoid-enriched diets, sourced from natural ingredients such as pumpkin, bell pepper, carrot, and gac, as well as a synthetic source like astaxanthin, on the coloration and growth of false clownfish. In a controlled experiment, juvenile fish with an initial average length of 3.21 ± 0.03 cm and weight of 0.61 ± 0.02 g were allocated to 60-liter tanks and fed the experimental diets over a 75-day trial period. Carotenoid supplementation was standardized at 250 mg/kg across diets, with a control group receiving no added carotenoids. The experimental design was completely randomized, involving three replicates per dietary treatment. The results indicated that diets supplemented with gac and bell pepper significantly enhanced growth and feed efficiency (p < 0.05). Notably, the skin redness intensity (a* value) was increased by 75.73% in the gac-supplemented group, 89.20% in the bell pepper group, and 91.99% in the astaxanthin group, relative to the control (p < 0.05). Additionally, carotenoid deposition in the integument was significantly higher in all supplemented groups, with an increase of 83.74% in the astaxanthin group, 89.59% in the gac group, and 98.43% in the bell pepper group, compared to the control (p < 0.05). These findings suggest that natural carotenoids, particularly from gac and bell pepper, can be effective alternatives to synthetic astaxanthin, potentially improving the attractiveness and commercial value of captive-bred false clownfish and alleviating the exploitation of wild populations.
{"title":"Plant-based carotenoid supplementation: Growth, feed utilization efficiency, and coloration in false clownfish (Amphiprion ocellaris)","authors":"Dung Van Tran, Hau Thi Luong, Khanh Thi Pham, Thanh Trung Dang, Nhan Thai Hua, Hung Quoc Pham","doi":"10.46989/001c.94193","DOIUrl":"https://doi.org/10.46989/001c.94193","url":null,"abstract":"The false clownfish (Amphiprion ocellaris) is a prominent species in the marine ornamental trade, valued for its vibrant orange-red coloration. However, aquaculture-bred individuals often exhibit less intense coloration than their wild counterparts, presenting a challenge for both breeders and aquarists. This study evaluates the effects of carotenoid-enriched diets, sourced from natural ingredients such as pumpkin, bell pepper, carrot, and gac, as well as a synthetic source like astaxanthin, on the coloration and growth of false clownfish. In a controlled experiment, juvenile fish with an initial average length of 3.21 ± 0.03 cm and weight of 0.61 ± 0.02 g were allocated to 60-liter tanks and fed the experimental diets over a 75-day trial period. Carotenoid supplementation was standardized at 250 mg/kg across diets, with a control group receiving no added carotenoids. The experimental design was completely randomized, involving three replicates per dietary treatment. The results indicated that diets supplemented with gac and bell pepper significantly enhanced growth and feed efficiency (p < 0.05). Notably, the skin redness intensity (a* value) was increased by 75.73% in the gac-supplemented group, 89.20% in the bell pepper group, and 91.99% in the astaxanthin group, relative to the control (p < 0.05). Additionally, carotenoid deposition in the integument was significantly higher in all supplemented groups, with an increase of 83.74% in the astaxanthin group, 89.59% in the gac group, and 98.43% in the bell pepper group, compared to the control (p < 0.05). These findings suggest that natural carotenoids, particularly from gac and bell pepper, can be effective alternatives to synthetic astaxanthin, potentially improving the attractiveness and commercial value of captive-bred false clownfish and alleviating the exploitation of wild populations.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"49 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140082659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tao Zhang, Xinya Chen, Ke Sun, Jiyi Chen, Xinxin Chen, Jilin Xu, Huilai Shi, Hongling Ping, Jie He, Bin Li, Yebing Yu, Lei Li, Yanming Sui
Microplastics (MPs) are a global concern regarding environmental pollution. This study evaluated the impacts of MPs with two sizes (5 µm and 0.5 µm) on hatching performance and microbiota of Sepiella japonica. The presence of MPs increased the hatching rate at some stages of the fertilization process and reduced the oxygen consumption rate at the gastrula stage. No size-dependent impact was observed. The 16S rRNA gene was sequenced to identify the flora. Clustering tags assessed species diversity in the samples with 97% similarity. Proteobacteria was the most abundant phylum in all three groups. MPs publicity appreciably modified flower structure. The most variable genera were Ralstonia, Methylophilus, and Pseudorhodoferax, which can furnish nutrients and modify the host’s immune response. MPs exposure appeared to enrich beneficial bacteria in this study. The presence of MPs with a size of 5µm played a greater role in this process, which is supported by presumptive functions. However, since the adsorption of suspended MPs on aquatic eggs can have cascading effects on specific life stages of oviparous animals, regular monitoring of microbial communities is necessary after juvenile S. japonica formation to prevent disease outbreaks.
{"title":"The presence of microplastics affects Sepiella maindroni hatching performance and microbiota colonization","authors":"Tao Zhang, Xinya Chen, Ke Sun, Jiyi Chen, Xinxin Chen, Jilin Xu, Huilai Shi, Hongling Ping, Jie He, Bin Li, Yebing Yu, Lei Li, Yanming Sui","doi":"10.46989/001c.94204","DOIUrl":"https://doi.org/10.46989/001c.94204","url":null,"abstract":"Microplastics (MPs) are a global concern regarding environmental pollution. This study evaluated the impacts of MPs with two sizes (5 µm and 0.5 µm) on hatching performance and microbiota of Sepiella japonica. The presence of MPs increased the hatching rate at some stages of the fertilization process and reduced the oxygen consumption rate at the gastrula stage. No size-dependent impact was observed. The 16S rRNA gene was sequenced to identify the flora. Clustering tags assessed species diversity in the samples with 97% similarity. Proteobacteria was the most abundant phylum in all three groups. MPs publicity appreciably modified flower structure. The most variable genera were Ralstonia, Methylophilus, and Pseudorhodoferax, which can furnish nutrients and modify the host’s immune response. MPs exposure appeared to enrich beneficial bacteria in this study. The presence of MPs with a size of 5µm played a greater role in this process, which is supported by presumptive functions. However, since the adsorption of suspended MPs on aquatic eggs can have cascading effects on specific life stages of oviparous animals, regular monitoring of microbial communities is necessary after juvenile S. japonica formation to prevent disease outbreaks.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"57 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140421384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cai-Yun Li, Xiao-Ai Li, Lin-Tao Tan, Ning Zhang, Yang Li, Ming Hu, Tao Xu
Skin ulceration syndrome is among the most harmful diseases in sea cucumber (Apostichopus japonicus). The annual loss due to this disease is more than 1 billion dollars, which seriously affected the healthy and sustainable development of A. japonicus. In this paper, animals were divided into 4 experimental groups: a control group given basic feed, experimental groups with 1% Lactobacillus, 1% Bacillus, 1% mixture with 0.5% Lactobacillus and 0.5% Bacillus added to the basic feed. After feeding for 60 days, the samples were taken to analyze the growth performance, digestive enzyme activity, and immune indexes of A. japonicus. Furthermore, the resistance to the skin ulceration syndrome of A. japonicus was analyzed. The results showed that the probiotics promoted the growth performance of A. japonicus, the weight gain rate of the control group was 120.08±12.07%, the weight gain rate of the Lactobacillus group was 152.11±10.06%, the weight gain rate of the Bacillus group was 148.03±9.88%, and the weight gain rate of the mixed bacteria group was as high as 210.11±19.41%. The digestive enzyme activities in the intestinal tract of A. japonicus increased significantly in the probiotic-added groups, and the mixed bacteria were more effective in enhancing the digestive enzyme activities than single Bacillus and Lactobacillus. In addition, the probiotics could significantly increase the phagocytosis rate of the body cavity cells of A. japonicus. The phagocytic rate of Lactobacillus and Bacillus subtilis was comparable; the mixed probiotics were significantly higher than those of single probiotics, and this phagocytic rate gradually increased over time. After Vibrio splendidus and Pseudoalteromonas infection, the mortality rate of A. japonicus in the probiotic-added group was reduced, which indicated that probiotics could improve the immunity of A. japonicus, and the ability to resist the infection of Vibrio splendidus and Pseudoalteromonas was enhanced. Bacillus exhibits superior antimicrobial ability compared to Lactobacillus, and the mixed strain displays the most effective antimicrobial properties. This study provided a scientific basis for effectively preventing and controlling skin ulceration syndrome in the aquaculture of A. japonicus.
{"title":"Effect of probiotic feed supplementation on skin ulceration syndrome in Apostichopus japonicus","authors":"Cai-Yun Li, Xiao-Ai Li, Lin-Tao Tan, Ning Zhang, Yang Li, Ming Hu, Tao Xu","doi":"10.46989/001c.92433","DOIUrl":"https://doi.org/10.46989/001c.92433","url":null,"abstract":"Skin ulceration syndrome is among the most harmful diseases in sea cucumber (Apostichopus japonicus). The annual loss due to this disease is more than 1 billion dollars, which seriously affected the healthy and sustainable development of A. japonicus. In this paper, animals were divided into 4 experimental groups: a control group given basic feed, experimental groups with 1% Lactobacillus, 1% Bacillus, 1% mixture with 0.5% Lactobacillus and 0.5% Bacillus added to the basic feed. After feeding for 60 days, the samples were taken to analyze the growth performance, digestive enzyme activity, and immune indexes of A. japonicus. Furthermore, the resistance to the skin ulceration syndrome of A. japonicus was analyzed. The results showed that the probiotics promoted the growth performance of A. japonicus, the weight gain rate of the control group was 120.08±12.07%, the weight gain rate of the Lactobacillus group was 152.11±10.06%, the weight gain rate of the Bacillus group was 148.03±9.88%, and the weight gain rate of the mixed bacteria group was as high as 210.11±19.41%. The digestive enzyme activities in the intestinal tract of A. japonicus increased significantly in the probiotic-added groups, and the mixed bacteria were more effective in enhancing the digestive enzyme activities than single Bacillus and Lactobacillus. In addition, the probiotics could significantly increase the phagocytosis rate of the body cavity cells of A. japonicus. The phagocytic rate of Lactobacillus and Bacillus subtilis was comparable; the mixed probiotics were significantly higher than those of single probiotics, and this phagocytic rate gradually increased over time. After Vibrio splendidus and Pseudoalteromonas infection, the mortality rate of A. japonicus in the probiotic-added group was reduced, which indicated that probiotics could improve the immunity of A. japonicus, and the ability to resist the infection of Vibrio splendidus and Pseudoalteromonas was enhanced. Bacillus exhibits superior antimicrobial ability compared to Lactobacillus, and the mixed strain displays the most effective antimicrobial properties. This study provided a scientific basis for effectively preventing and controlling skin ulceration syndrome in the aquaculture of A. japonicus.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"73 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140439939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuwei Wang, Chao Zhang, Huizhu Nan, Shi Yin, Mengjuan Cao, Ruiyong An, Lei Ma
Blastocystis sp. is a eukaryotic protozoan parasite reported in patients with diarrhea and irritable bowel syndrome. So far, it has been determined the parasite occurs in the intestinal tract of humans and animals worldwide. However, few studies have investigated the distribution of Blastocystis sp. in cold-water fish and cultured water. After DNA extraction of tissue and water samples, a polymerase chain reaction (PCR) assay was established to detect Blastocystis sp. The results showed the detection rate of the parasite was 3.70% in the tissue samples and 6.29% in water samples. Only the ST1 subtype was in fish, but five subtypes, ST1, ST2, ST10, ST21, and ST24, were detected in water samples. There were no significant differences in the water distribution rate of Blastocystis sp. The presence of Blastocystis sp. was detected in the intestinal digesta of cold-water fish for the first time in this study, which hinted that Blastocystis sp. may infect cold-water fish. It is speculated that Blastocystis sp. entered the intestinal tract of fish with feeding and water flow. The results will provide data support for ecological prevention and control of cold-water fish diseases and lay a foundation for the formulation of sustainable aquaculture development strategies.
{"title":"Molecular Detection and Subtype Distribution of Blastocystis sp. in Cold-water Fish and cultured water","authors":"Yuwei Wang, Chao Zhang, Huizhu Nan, Shi Yin, Mengjuan Cao, Ruiyong An, Lei Ma","doi":"10.46989/001c.92504","DOIUrl":"https://doi.org/10.46989/001c.92504","url":null,"abstract":"Blastocystis sp. is a eukaryotic protozoan parasite reported in patients with diarrhea and irritable bowel syndrome. So far, it has been determined the parasite occurs in the intestinal tract of humans and animals worldwide. However, few studies have investigated the distribution of Blastocystis sp. in cold-water fish and cultured water. After DNA extraction of tissue and water samples, a polymerase chain reaction (PCR) assay was established to detect Blastocystis sp. The results showed the detection rate of the parasite was 3.70% in the tissue samples and 6.29% in water samples. Only the ST1 subtype was in fish, but five subtypes, ST1, ST2, ST10, ST21, and ST24, were detected in water samples. There were no significant differences in the water distribution rate of Blastocystis sp. The presence of Blastocystis sp. was detected in the intestinal digesta of cold-water fish for the first time in this study, which hinted that Blastocystis sp. may infect cold-water fish. It is speculated that Blastocystis sp. entered the intestinal tract of fish with feeding and water flow. The results will provide data support for ecological prevention and control of cold-water fish diseases and lay a foundation for the formulation of sustainable aquaculture development strategies.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"431 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140473016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hoang N. Manh, Tran T.T. Suong, Pham T.P. Lan, Nguyen D.Q. Tram
In snakehead fish farming, feeding represents the largest portion (accounting for 50-60%) of production cost. Thus, finding an alternative natural feed that can be replaced as full or partial inclusion in snakehead fish commercial diets is urgently needed. This study was carried out to evaluate the effect of including fresh or dried black soldier fly larvae (BSFL) in diets on the growth performance and chemical composition of snakehead fish cultured in small-scale farms. Fingerlings of snakehead (5.15 ± 0.12 g) were distributed randomly into fifteen net cages (6 m3) at a density of 120 fish.net cage-1. Including five dietary treatments named: NT1 (100% commercial feed served as a control); NT2 (100% fresh BSFL); NT3 (100% dried BSFL); NT4 (50% fresh BSFL + 50% commercial feed); and NT5 (50% dried BSFL + 50% commercial feed). Each treatment was performed in triplicate. The results showed that the inclusion of fresh BSFL in diets for the snakehead fish did not affect the survival rate (82.22 - 85.56 %), improved feed conversion ratio, increased live weight (70.9 – 103.3 g) and daily weight gain (1.09 – 1.64 g.day-1), and fish’s yield (1.16 – 1.73 kg.m-2); and did not affect the chemical composition of the fish. These findings suggest that farmers should feed snakehead fish with commercial feed plus fresh black soldier fly larvae to maintain good condition factor and enhance fish growth performance and production.
{"title":"Effect of Inclusion of Fresh or dried black soldier fly larvae in Diets on Snakehead Fish’s Growth Performance and Chemical Composition (Channa sp.)","authors":"Hoang N. Manh, Tran T.T. Suong, Pham T.P. Lan, Nguyen D.Q. Tram","doi":"10.46989/001c.92338","DOIUrl":"https://doi.org/10.46989/001c.92338","url":null,"abstract":"In snakehead fish farming, feeding represents the largest portion (accounting for 50-60%) of production cost. Thus, finding an alternative natural feed that can be replaced as full or partial inclusion in snakehead fish commercial diets is urgently needed. This study was carried out to evaluate the effect of including fresh or dried black soldier fly larvae (BSFL) in diets on the growth performance and chemical composition of snakehead fish cultured in small-scale farms. Fingerlings of snakehead (5.15 ± 0.12 g) were distributed randomly into fifteen net cages (6 m3) at a density of 120 fish.net cage-1. Including five dietary treatments named: NT1 (100% commercial feed served as a control); NT2 (100% fresh BSFL); NT3 (100% dried BSFL); NT4 (50% fresh BSFL + 50% commercial feed); and NT5 (50% dried BSFL + 50% commercial feed). Each treatment was performed in triplicate. The results showed that the inclusion of fresh BSFL in diets for the snakehead fish did not affect the survival rate (82.22 - 85.56 %), improved feed conversion ratio, increased live weight (70.9 – 103.3 g) and daily weight gain (1.09 – 1.64 g.day-1), and fish’s yield (1.16 – 1.73 kg.m-2); and did not affect the chemical composition of the fish. These findings suggest that farmers should feed snakehead fish with commercial feed plus fresh black soldier fly larvae to maintain good condition factor and enhance fish growth performance and production.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"11 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140488665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The mud crab Scylla paramamosain is a valuable commercial mariculture crab worldwide. During the ebb tide or when transported to market, crabs suffer underlying air exposure stress. Gills tissue is the first tissue to cope with this stress. In this study, the transcriptome of S. paramamosain gills from the control group (CG) and experimental group (EG) were sequenced, assembled, and compared. A total of 7,425,620,293 bp and 6,741,616,977 bp clean data were found in EG and CG, respectively. A total of 38,507 unigenes (42.78%) were annotated successfully. 13,626 differentially expressed genes (DEGs) were up-regulated, and 6,502 DEGs were down-regulated. The DEGs related to immunity, apoptosis, metabolism, and ion exchange were detected. DEGs were enriched significantly into the KEGG pathways related to metabolism and immunity. These results proved that more material and energy were required, and immune defense was enhanced when the crab was under air exposure stress. The present study provides the first-gill transcriptomic analysis challenged with air exposure stress in S. paramamosain under air exposure stress, which will be useful to clarify the molecular mechanisms of air exposure adaptation.
泥蟹（Scylla paramamosain）是世界上一种珍贵的商业海产养殖蟹。在退潮期间或运往市场时，螃蟹会受到潜在的空气暴露应激。鳃组织是应对这种应激的第一个组织。本研究对对照组（CG）和实验组（EG）副鳃的转录组进行了测序、组装和比较。在 EG 和 CG 中分别发现了 7,425,620,293 bp 和 6,741,616,977 bp 的干净数据。共有 38,507 个单基因（42.78%）被成功注释。13626个差异表达基因（DEGs）被上调，6502个DEGs被下调。检测到的 DEGs 与免疫、细胞凋亡、新陈代谢和离子交换有关。与新陈代谢和免疫有关的 KEGG 通路显著富集了 DEGs。这些结果证明，当河蟹受到空气暴露胁迫时，需要更多的物质和能量，免疫防御能力增强。本研究首次对处于空气暴露胁迫下的巴拉莫沙蟹进行了鳃转录组学分析，这将有助于阐明空气暴露适应的分子机制。
{"title":"Transcriptome profiling of the gills to air exposure in mud crab Scylla paramamosain","authors":"Sigang Fan, Yihui Guo, Changhong Cheng, Xiaolin Huang, Hongling Ma, Zhixun Guo, Qibin Yang, Guangxin Liu, Yougen Gao","doi":"10.46989/001c.92247","DOIUrl":"https://doi.org/10.46989/001c.92247","url":null,"abstract":"The mud crab Scylla paramamosain is a valuable commercial mariculture crab worldwide. During the ebb tide or when transported to market, crabs suffer underlying air exposure stress. Gills tissue is the first tissue to cope with this stress. In this study, the transcriptome of S. paramamosain gills from the control group (CG) and experimental group (EG) were sequenced, assembled, and compared. A total of 7,425,620,293 bp and 6,741,616,977 bp clean data were found in EG and CG, respectively. A total of 38,507 unigenes (42.78%) were annotated successfully. 13,626 differentially expressed genes (DEGs) were up-regulated, and 6,502 DEGs were down-regulated. The DEGs related to immunity, apoptosis, metabolism, and ion exchange were detected. DEGs were enriched significantly into the KEGG pathways related to metabolism and immunity. These results proved that more material and energy were required, and immune defense was enhanced when the crab was under air exposure stress. The present study provides the first-gill transcriptomic analysis challenged with air exposure stress in S. paramamosain under air exposure stress, which will be useful to clarify the molecular mechanisms of air exposure adaptation.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"42 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139602609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jing Wang, Zhiyuan Zhao, Hongtao Jin, Chen Sun, ShengXia Liu
The fisheries industry in China is experiencing rapid growth, but it is also encountering the challenge of frequent fluctuations in aquatic product prices. Freshwater fish aquaculture plays a crucial role in China’s fisheries industry. Analyzing the characteristics of price volatility in freshwater fish is crucial to ensure a stable supply of aquatic products and promote sustainable fisheries industry development. This study focuses on four freshwater fish species, namely crucian carp, grass carp, silver carp, and carp, to analyze the price volatility characteristics of freshwater fish in China from 2006 to 2022. The study uses the price decomposition method and the ARCH model. The results indicate that, from the perspective of dominant characteristics of price volatility, the prices of freshwater fish display periodic volatility with an overall upward trend, as well as significant seasonal and random variations. From the perspective of recessive price volatility characteristics, the price volatility of freshwater fish exhibits clustering and asymmetry. This indicates that the price volatility of freshwater fish is influenced by previous price volatility. Positive news has a greater impact on the price volatility of freshwater fish than negative news. Out of the four freshwater fish species, only the price of crucian carp is characterized by high-risk and high-return volatility.
{"title":"Price volatility characteristics and policy implications of freshwater fish in China","authors":"Jing Wang, Zhiyuan Zhao, Hongtao Jin, Chen Sun, ShengXia Liu","doi":"10.46989/001c.92048","DOIUrl":"https://doi.org/10.46989/001c.92048","url":null,"abstract":"The fisheries industry in China is experiencing rapid growth, but it is also encountering the challenge of frequent fluctuations in aquatic product prices. Freshwater fish aquaculture plays a crucial role in China’s fisheries industry. Analyzing the characteristics of price volatility in freshwater fish is crucial to ensure a stable supply of aquatic products and promote sustainable fisheries industry development. This study focuses on four freshwater fish species, namely crucian carp, grass carp, silver carp, and carp, to analyze the price volatility characteristics of freshwater fish in China from 2006 to 2022. The study uses the price decomposition method and the ARCH model. The results indicate that, from the perspective of dominant characteristics of price volatility, the prices of freshwater fish display periodic volatility with an overall upward trend, as well as significant seasonal and random variations. From the perspective of recessive price volatility characteristics, the price volatility of freshwater fish exhibits clustering and asymmetry. This indicates that the price volatility of freshwater fish is influenced by previous price volatility. Positive news has a greater impact on the price volatility of freshwater fish than negative news. Out of the four freshwater fish species, only the price of crucian carp is characterized by high-risk and high-return volatility.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"50 26","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139611417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fishery is a strategic and fundamental core industry in China. Since the 18th National Congress of the Communist Party of China, the central government has attached great importance to the fishery industry and has issued a series of policies to promote its revitalization and vigorous development. In the favorable policy environment, it is crucial for leading fisheries enterprises to pay attention to financial performance evaluation and strive to improve their own operational efficiency. In this study, we selected seven leading fisheries enterprises as research subjects and used the entropy-weighted TOPSIS method to construct a financial performance evaluation system from four dimensions: debt-paying ability, operational capability, profitability, and development potential. We then conducted performance evaluations on the seven sample companies. The research findings indicate that enterprises should focus on their development capabilities to improve their potential for sustained development, enhance the operational efficiency of fisheries enterprises, and promote their continuous and healthy growth.
{"title":"Financial Performance Evaluation of Leading Fisheries Enterprises Based on Entropy-Weighted TOPSIS Method","authors":"Shan Gao, Qingqing Jiang, Zhuming Zhao, Wu Biao","doi":"10.46989/001c.92100","DOIUrl":"https://doi.org/10.46989/001c.92100","url":null,"abstract":"Fishery is a strategic and fundamental core industry in China. Since the 18th National Congress of the Communist Party of China, the central government has attached great importance to the fishery industry and has issued a series of policies to promote its revitalization and vigorous development. In the favorable policy environment, it is crucial for leading fisheries enterprises to pay attention to financial performance evaluation and strive to improve their own operational efficiency. In this study, we selected seven leading fisheries enterprises as research subjects and used the entropy-weighted TOPSIS method to construct a financial performance evaluation system from four dimensions: debt-paying ability, operational capability, profitability, and development potential. We then conducted performance evaluations on the seven sample companies. The research findings indicate that enterprises should focus on their development capabilities to improve their potential for sustained development, enhance the operational efficiency of fisheries enterprises, and promote their continuous and healthy growth.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"97 49","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139612663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kaixin Zhang, Jiyi Chen, Shuxin Zhang, Xinxin Chen, Ke Sun, Pujie Liu, Hongshan Li, Yanming Sui
Pesticide contamination is commonly found as a mixture of different pesticides rather than individual compounds. However, the regulatory risk evaluation is mostly based on the effects of individual pesticides. In the present study, we aimed to investigate the individual and combined toxicities of cypermethrin (CYP) with emamectin benzoate (EMB) and imidacloprid (IMI) to crayfish using acute indices and various sub-lethal endpoints. Semi-static bioassay procedures were followed in the experiment. The 24, 48, and 72 h LC50 values (with 95% confidence limits) of CYP for crayfish were calculated as 0.141, 0.137, and 0.135 μg/ml, respectively, which were higher than those of IMI (75.813, 72.345, 70.568 μg/ml) and EMB (34.581, 27.930, 22.298 μg/ml). Pesticide mixtures of CYP and EMB displayed a synergistic response to crayfish; the LC50 was 0.053, 0.050, and 0.048 μg/ml, which was lower than when only CYP was present. Pesticide mixtures of CYP and EMB were found to be highly toxic to crayfish. At the physiological level, both individuals and mixtures of pesticides caused severe injury to the internal organs of crayfish. Taken together, the synergistic effects indicated that it was highly important to include joint toxicity studies when assessing the risk of pesticides.
{"title":"The acute toxicity of cypermethrin, emamectin benzoate and imidacloprid on red swamp crayfish (Procambarus clarkia)","authors":"Kaixin Zhang, Jiyi Chen, Shuxin Zhang, Xinxin Chen, Ke Sun, Pujie Liu, Hongshan Li, Yanming Sui","doi":"10.46989/001c.92177","DOIUrl":"https://doi.org/10.46989/001c.92177","url":null,"abstract":"Pesticide contamination is commonly found as a mixture of different pesticides rather than individual compounds. However, the regulatory risk evaluation is mostly based on the effects of individual pesticides. In the present study, we aimed to investigate the individual and combined toxicities of cypermethrin (CYP) with emamectin benzoate (EMB) and imidacloprid (IMI) to crayfish using acute indices and various sub-lethal endpoints. Semi-static bioassay procedures were followed in the experiment. The 24, 48, and 72 h LC50 values (with 95% confidence limits) of CYP for crayfish were calculated as 0.141, 0.137, and 0.135 μg/ml, respectively, which were higher than those of IMI (75.813, 72.345, 70.568 μg/ml) and EMB (34.581, 27.930, 22.298 μg/ml). Pesticide mixtures of CYP and EMB displayed a synergistic response to crayfish; the LC50 was 0.053, 0.050, and 0.048 μg/ml, which was lower than when only CYP was present. Pesticide mixtures of CYP and EMB were found to be highly toxic to crayfish. At the physiological level, both individuals and mixtures of pesticides caused severe injury to the internal organs of crayfish. Taken together, the synergistic effects indicated that it was highly important to include joint toxicity studies when assessing the risk of pesticides.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139613641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Zhou, Weijie Cui, Zhongtang He, Li Xu, Feng Yang, Qun Lu, Jianhu Liu, Tao He
Otolith is important for studying fish populations and life histories. In this study, the dominant species of Schizothorax grahami in the source section of the Chishui River was taken to understand the relationships between otolith morphology and total length (TL). Results showed a large difference between the four TL groups (A/B/C/D), except group B is similar to group C. The combined discrimination success rate of linear discriminant analysis was 62.2%. Group A and D’s success rate is the highest, at around 75%. Meanwhile, the success rate for Group B and Group C is below 65%. The one-way ANOVA of the Shape Index and the Canonical analysis of Principal Coordinates with two coefficients (Fourier coefficients and Wavelet coefficients) showed that Group B is similar to Group C, with a large difference from the other two groups. When TL was greater than 100 mm (the pearl organs appearing), the otolith growth was lower changing. Otolith morphology still changes with growth after sexual maturity in fish, so the larger fish is more useful for conducting otolith morphology studies for accurate evaluation and management of local fishery resources.
耳石对于研究鱼类种群和生活史非常重要。本研究以赤水河源头河段的优势种石斑鱼（Schizothorax grahami）为研究对象，了解耳石形态与总长度（TL）的关系。结果表明，除B组与C组相似外，A/B/C/D四个总长度组之间差异较大，线性判别分析的综合判别成功率为62.2%。A 组和 D 组的成功率最高，约为 75%。同时，B 组和 C 组的成功率低于 65%。形状指数单因子方差分析和主坐标双系数（傅立叶系数和小波系数）卡农分析表明，B 组与 C 组相似，与其他两组差异较大。当 TL 大于 100 mm（出现珍珠器官）时，耳石的生长变化较小。鱼类性成熟后，耳石形态仍会随着生长而变化，因此对较大的鱼类进行耳石形态研究更有利于准确评估和管理当地渔业资源。
{"title":"Otolith morphology and total length relationships in Schizothorax grahami","authors":"Yang Zhou, Weijie Cui, Zhongtang He, Li Xu, Feng Yang, Qun Lu, Jianhu Liu, Tao He","doi":"10.46989/001c.92009","DOIUrl":"https://doi.org/10.46989/001c.92009","url":null,"abstract":"Otolith is important for studying fish populations and life histories. In this study, the dominant species of Schizothorax grahami in the source section of the Chishui River was taken to understand the relationships between otolith morphology and total length (TL). Results showed a large difference between the four TL groups (A/B/C/D), except group B is similar to group C. The combined discrimination success rate of linear discriminant analysis was 62.2%. Group A and D’s success rate is the highest, at around 75%. Meanwhile, the success rate for Group B and Group C is below 65%. The one-way ANOVA of the Shape Index and the Canonical analysis of Principal Coordinates with two coefficients (Fourier coefficients and Wavelet coefficients) showed that Group B is similar to Group C, with a large difference from the other two groups. When TL was greater than 100 mm (the pearl organs appearing), the otolith growth was lower changing. Otolith morphology still changes with growth after sexual maturity in fish, so the larger fish is more useful for conducting otolith morphology studies for accurate evaluation and management of local fishery resources.","PeriodicalId":506439,"journal":{"name":"Israeli Journal of Aquaculture - Bamidgeh","volume":"8 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139526097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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