The present research aimed to evaluate the effects of fig (Ficus carica) extract on growth and hemato-immunological parameters of great sturgeon (Huso huso). Fig extract was added to the basal diet (protein 45.3% and lipid 14.7%) at four levels of 0, 1, 2, and 4 g kg-1 and fed in triplicate groups. A total of 84 juveniles weighing 1078.21±64.07 g were introduced into 12 ponds. Results indicated that dietary inclusion of fig extract at 2 g kg-1 significantly increased the total length, weight gain, average daily gain, specific growth rate, and condition factor of fish compared to other treatments (P<0.05). Food conversion ratio was remarkably (P<0.05) improved in fish that received fig extract at 2 g kg-1. Significant effects were recorded in number of red and white blood cells, values of hematocrit, hemoglobin, lysozyme activity, and immunoglobulin M (IgM) in fish fed diet supplemented with fig extract at 2 g kg-1 (P<0.05). Significant changes were also found in liver enzymes (AST, ALT, and ALP) among treatments. In conclusion, administration of fig extract at 2 g kg-1 can improve hematological parameters and stimulates immune responses as well as enhancement of growth performance in great sturgeon.
本研究旨在评价无花果提取物对大鲟生长和血液免疫参数的影响。将无花果提取物以0、1、2和4 g kg-1的四个水平添加到基础日粮中（蛋白质45.3%，脂质14.7%），并分三组喂食。共有84只体重1078.21±64.07克的幼鱼被引入12个池塘。结果表明，与其他处理相比，日粮中加入2g kg-1无花果提取物显著提高了鱼的总长度、增重、平均日增重、比生长率和条件因子（P<0.05）。在添加无花果提取物2g kg-1的鱼饲料中，红细胞和白细胞数量、红细胞比容、血红蛋白、溶菌酶活性和免疫球蛋白M（IgM）的值都有显著影响（P<0.05）。在不同处理之间，肝酶（AST、ALT和ALP）也有显著变化。总之，施用2g kg-1的无花果提取物可以改善大鲟的血液学参数，刺激免疫反应，并提高其生长性能。
{"title":"Dietary Effects of Fig (Ficus carica) Extract on Growth, Survival and Hemato-immunological Indices in Great Sturgeon (Huso huso)","authors":"R. Taati, S. Abolghasemi","doi":"10.4194/trjfas22233","DOIUrl":"https://doi.org/10.4194/trjfas22233","url":null,"abstract":"The present research aimed to evaluate the effects of fig (Ficus carica) extract on growth and hemato-immunological parameters of great sturgeon (Huso huso). Fig extract was added to the basal diet (protein 45.3% and lipid 14.7%) at four levels of 0, 1, 2, and 4 g kg-1 and fed in triplicate groups. A total of 84 juveniles weighing 1078.21±64.07 g were introduced into 12 ponds. Results indicated that dietary inclusion of fig extract at 2 g kg-1 significantly increased the total length, weight gain, average daily gain, specific growth rate, and condition factor of fish compared to other treatments (P<0.05). Food conversion ratio was remarkably (P<0.05) improved in fish that received fig extract at 2 g kg-1. Significant effects were recorded in number of red and white blood cells, values of hematocrit, hemoglobin, lysozyme activity, and immunoglobulin M (IgM) in fish fed diet supplemented with fig extract at 2 g kg-1 (P<0.05). Significant changes were also found in liver enzymes (AST, ALT, and ALP) among treatments. In conclusion, administration of fig extract at 2 g kg-1 can improve hematological parameters and stimulates immune responses as well as enhancement of growth performance in great sturgeon.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45284836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Black soldier fly (BSF; Hermetia illucens) has received growing attention as an alternative sustainable ingredient for aquafeeds. This study aimed to investigate the effects of direct BSF feeding on growth, health, and filet quality of rainbow trout. Fish were fed with dried black soldier fly (BSF) prepupae for one, two, or three meals a day. After 90 days of feeding, a substantial reduction in growth was found in dried BSF fed groups as daily dried BSF meal increased. Rejection and reduction in feed intake were only observed in the fish group that was fed with dried BSF 3 times a day. Amino acid content of BSF prepupae was significantly higher than that of commercial diet and some of the fatty acid contents were similar toor higher than commercial diet. When fish were fed with dried BSF 2 or 3 times a day, chitin accumulated in the fish's gut, causing constipation and leading to a decreased or rejected feed intake. A substantial decreasing trend was detected in arginine, histidine, and threonine with the increase in the number of dried BSF meals, while isoleucine, leucine, tryptophan, and alanine levels were considerably increased. Inclusion of one dried BSF meal in a daily feeding resulted in improvements in fish PUFAn-3, PUFAn-6, and DPA fatty acid levels.
{"title":"Growth, Health and Fillet Quality of Rainbow Trout (Oncorhynchus mykiss) Fed Directly with Black Soldier Fly (Hermetia illucens) Prepupae","authors":"R. C. Ozturk, I. Yandi, Y. Terzi, I. Altinok","doi":"10.4194/trjfas21683","DOIUrl":"https://doi.org/10.4194/trjfas21683","url":null,"abstract":"Black soldier fly (BSF; Hermetia illucens) has received growing attention as an alternative sustainable ingredient for aquafeeds. This study aimed to investigate the effects of direct BSF feeding on growth, health, and filet quality of rainbow trout. Fish were fed with dried black soldier fly (BSF) prepupae for one, two, or three meals a day. After 90 days of feeding, a substantial reduction in growth was found in dried BSF fed groups as daily dried BSF meal increased. Rejection and reduction in feed intake were only observed in the fish group that was fed with dried BSF 3 times a day. Amino acid content of BSF prepupae was significantly higher than that of commercial diet and some of the fatty acid contents were similar toor higher than commercial diet. When fish were fed with dried BSF 2 or 3 times a day, chitin accumulated in the fish's gut, causing constipation and leading to a decreased or rejected feed intake. A substantial decreasing trend was detected in arginine, histidine, and threonine with the increase in the number of dried BSF meals, while isoleucine, leucine, tryptophan, and alanine levels were considerably increased. Inclusion of one dried BSF meal in a daily feeding resulted in improvements in fish PUFAn-3, PUFAn-6, and DPA fatty acid levels.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41671029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study aims to analyze the exploitation status of the sin croaker Johnius dussumieri (Cuvier, 1830) fishery from Tamil Nadu, India waters. Annual catch and effort data were reconstructed from 2001 to 2020 and analyzed with different surplus production models using Catch and Effort Data Analysis (CEDA), Catch-based MSY (CMSY) and the Bayesian state-space implementation of the Schaefer production Model (BSM). The result of biological reference points such as maximum sustainable yield (MSY), relative stock size (B/BMSY) and relative exploitation rate (F/FMSY) from CEDA was 1,746 metric tonnes (MT), 0.93 and 1.11 respectively. However, CMSY and BSM models estimated MSY, B/BMSY and F/FMSY at 1,650 MT, 0.74 and 1.28 respectively. Hence, it can be inferred that the sin croaker fishery of Tamil Nadu, which was healthy during its initial stage distorted to overfishing status. Therefore, the present study recommends a reduction in fishing efforts and the implementation of conservation measures for better management and sustainable exploitation of the fishery.
{"title":"Stock Assessment of Sin Croaker Johnius dussumieri (Cuvier, 1830) Fishery by Different Production Model Approach from Tamil Nadu, Southeast Coast of India","authors":"R. Abinaya, Moosambikandy K. Sajeevan","doi":"10.4194/trjfas22465","DOIUrl":"https://doi.org/10.4194/trjfas22465","url":null,"abstract":"The present study aims to analyze the exploitation status of the sin croaker Johnius dussumieri (Cuvier, 1830) fishery from Tamil Nadu, India waters. Annual catch and effort data were reconstructed from 2001 to 2020 and analyzed with different surplus production models using Catch and Effort Data Analysis (CEDA), Catch-based MSY (CMSY) and the Bayesian state-space implementation of the Schaefer production Model (BSM). The result of biological reference points such as maximum sustainable yield (MSY), relative stock size (B/BMSY) and relative exploitation rate (F/FMSY) from CEDA was 1,746 metric tonnes (MT), 0.93 and 1.11 respectively. However, CMSY and BSM models estimated MSY, B/BMSY and F/FMSY at 1,650 MT, 0.74 and 1.28 respectively. Hence, it can be inferred that the sin croaker fishery of Tamil Nadu, which was healthy during its initial stage distorted to overfishing status. Therefore, the present study recommends a reduction in fishing efforts and the implementation of conservation measures for better management and sustainable exploitation of the fishery.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46664971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The objective of conducted research was to analyze the growth performance, fatty acid (FA) metabolism and gene expressions related to polyunsaturated fatty acid (PUFA) metabolism in Oncorhynchus mykiss fed diets containing fish oil (FO), sesame oil (SO), linseed oil (LO) and olive oil (OO). Based on the results of the whole body FA balance method of the study, it was concluded that rainbow trout used n-3 PUFAs as energy and this affected the oxidation of n-6 long-chain polyunsaturated FAs (LC-PUFAs). Gene expression level of the Δ-6 desaturase was the lowest for FO and the highest for SO fed fish (P<0.05). Fish fed with OO had the lowest and fish fed with FO had the highest expression levels of elongase gene (P<0.05). The elongase (ELOVL5) transcription rate was higher in fish fed with FO diet and lower in fish fed with OO diet (P<0.05). In conclusion, this research indicated that the final n-3 PUFA ratio in fish fed with vegetable oil diets can be increased by the addition of 18:3n-3 and the decreased level of total dietary 18:2n-6, the balancing of dietary FAs with a proper content of saturated FA (SFA) and monounsaturated FA (MUFA) is substantial for the best growth.
{"title":"Effects of Different Vegetable Oils on the Fatty Acid Metabolism Based on Whole Body Fatty Acid Balance Method and Gene Expression of Rainbow Trout (Oncorhynchus mykiss)","authors":"İrem Köse Reis, M. Yıldız, A. Çakiris","doi":"10.4194/trjfas20667","DOIUrl":"https://doi.org/10.4194/trjfas20667","url":null,"abstract":"The objective of conducted research was to analyze the growth performance, fatty acid (FA) metabolism and gene expressions related to polyunsaturated fatty acid (PUFA) metabolism in Oncorhynchus mykiss fed diets containing fish oil (FO), sesame oil (SO), linseed oil (LO) and olive oil (OO). Based on the results of the whole body FA balance method of the study, it was concluded that rainbow trout used n-3 PUFAs as energy and this affected the oxidation of n-6 long-chain polyunsaturated FAs (LC-PUFAs). Gene expression level of the Δ-6 desaturase was the lowest for FO and the highest for SO fed fish (P<0.05). Fish fed with OO had the lowest and fish fed with FO had the highest expression levels of elongase gene (P<0.05). The elongase (ELOVL5) transcription rate was higher in fish fed with FO diet and lower in fish fed with OO diet (P<0.05). In conclusion, this research indicated that the final n-3 PUFA ratio in fish fed with vegetable oil diets can be increased by the addition of 18:3n-3 and the decreased level of total dietary 18:2n-6, the balancing of dietary FAs with a proper content of saturated FA (SFA) and monounsaturated FA (MUFA) is substantial for the best growth.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49150488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The effects of several antioxidants added to cryopreservation extenders on turbot (Scophthalmus maximus) sperm post-thaw motility, fertilization, sperm characteristics, and DNA damage were investigated. The following antioxidants were used in conjunction with the conventional extenders: rosmarinic acid (RA) (25, 50, and 100 μg/ml); uric acid (UA) (25, 50, and 100 μg/ml); and taurine (TA) (25, 50, and 100 μg/ml). On sperm samples that had been diluted by the extenders at a 1:9 ratio, cryopreservation was carried out. The results demonstrated that the post-thaw motility of sperm was higher in 25 μg/ml RA (77.41±2.90%), followed by 50 μg/ml RA (74.86±3.2%), 50 and 100 μg/ml UA (69.56±3.30% and 70.74±2.51%, respectively) which significantly differentiated from conventional extender. The highest hatching rate (70.67±4.67%) was attained at UA 50 μg/ml, while the highest fertilization rate (81.67±2.52%) was observed in RA 25 μg/ml. At UA 50 μg/ml, the DNA fragmentation rate was lowest (5.07±1.57%). In conclusion, antioxidants had a protective impact on sperm of turbot that had been frozen and thawed.
{"title":"Effect of Antioxidants on Cryopreserved Turbot (Scophthalmus maximus) Spermatozoa Quality and DNA Damage","authors":"H. Polat, İ. Kurtoğlu","doi":"10.4194/trjfas22300","DOIUrl":"https://doi.org/10.4194/trjfas22300","url":null,"abstract":"The effects of several antioxidants added to cryopreservation extenders on turbot (Scophthalmus maximus) sperm post-thaw motility, fertilization, sperm characteristics, and DNA damage were investigated. The following antioxidants were used in conjunction with the conventional extenders: rosmarinic acid (RA) (25, 50, and 100 μg/ml); uric acid (UA) (25, 50, and 100 μg/ml); and taurine (TA) (25, 50, and 100 μg/ml). On sperm samples that had been diluted by the extenders at a 1:9 ratio, cryopreservation was carried out. The results demonstrated that the post-thaw motility of sperm was higher in 25 μg/ml RA (77.41±2.90%), followed by 50 μg/ml RA (74.86±3.2%), 50 and 100 μg/ml UA (69.56±3.30% and 70.74±2.51%, respectively) which significantly differentiated from conventional extender. The highest hatching rate (70.67±4.67%) was attained at UA 50 μg/ml, while the highest fertilization rate (81.67±2.52%) was observed in RA 25 μg/ml. At UA 50 μg/ml, the DNA fragmentation rate was lowest (5.07±1.57%). In conclusion, antioxidants had a protective impact on sperm of turbot that had been frozen and thawed.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45048396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adhesion of biofouling organism creates various problems. Efforts to explore the source of the antifouling material from marine organisms have been carried out, but it is non-cultivable mainly; its work efficiency depends on temperature, pH, concentration, and ineffective exposure time. Therefore, it is necessary to explore new sources of antifouling material by developing antifouling biocomposites from chitosan-ZnO. This study aims to determine the effect of differences in concentration of chitosan and ZnO on biocomposite characterization. This study consisted of 3 stages, 1) characterization of chitosan and ZnO; 2) production and characterization of chitosan-ZnO biocomposite; and 3) antifouling activity testing. The results showed that chitosan was completely soluble in 2% acetic acid with a viscosity of 76.4 to 79.6%, a water content of 10.92%, ash of 1.92%, nitrogen of 3.70%, and a deacetylation level of 85%. The ZnO used in this study had a particle size of 396.1-458.7 nm. Biocomposite characteristics indicated that the best treatment was chitosan 1% -ZnO 0.6 g with 0.31% swelling, 0.18% solubility film, 104.50° hydrophobic and 4.50 MPa adhesion. The results of the anti-fouling tests showed that the treatment of chitosan 1% -ZnO 0.6 g had less biofouling than other treatments.
{"title":"Production and Physicochemical Characterization of Antifouling Biocomposites; The Effect of Chitosan and ZnO to Prevent Marine Biofouling","authors":"Desy Arisandi, B. Ibrahim, Joko Santoso","doi":"10.4194/trjfas19268","DOIUrl":"https://doi.org/10.4194/trjfas19268","url":null,"abstract":"Adhesion of biofouling organism creates various problems. Efforts to explore the source of the antifouling material from marine organisms have been carried out, but it is non-cultivable mainly; its work efficiency depends on temperature, pH, concentration, and ineffective exposure time. Therefore, it is necessary to explore new sources of antifouling material by developing antifouling biocomposites from chitosan-ZnO. This study aims to determine the effect of differences in concentration of chitosan and ZnO on biocomposite characterization. This study consisted of 3 stages, 1) characterization of chitosan and ZnO; 2) production and characterization of chitosan-ZnO biocomposite; and 3) antifouling activity testing. The results showed that chitosan was completely soluble in 2% acetic acid with a viscosity of 76.4 to 79.6%, a water content of 10.92%, ash of 1.92%, nitrogen of 3.70%, and a deacetylation level of 85%. The ZnO used in this study had a particle size of 396.1-458.7 nm. Biocomposite characteristics indicated that the best treatment was chitosan 1% -ZnO 0.6 g with 0.31% swelling, 0.18% solubility film, 104.50° hydrophobic and 4.50 MPa adhesion. The results of the anti-fouling tests showed that the treatment of chitosan 1% -ZnO 0.6 g had less biofouling than other treatments.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45949138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ji Zhang, Qingyue Shen, Hanchen Miao, Qintong Li, Marie Shimada, Tian Yuan, M. Utsumi, Z. Lei, Zhenya Zhang, H. Takanashi, Naoshi Fujimoto, S. Ichise, Yasuhiro Asada, O. Nishimura, M. Akiba, K. Shimizu
Consumers often complain about taste and odor (T&O) in drinking water and freshwater fishery. One of the common T&O compounds, 2-methylisoborneol (2-MIB), can be detected by humans even when the concentration is below 10 ng/L. A forecast method of T&O occurrence is required to control drinking water plants and fishery farms to determine the timing of exchange of activated carbon or exchange the water in earthy pond. Traditional monitoring methods such as PCR, microscopy, and chemical analysis require a long time, are high in cost, and have a complex operation. We conducted this study to develop whole-cell PCR and whole-cell qPCR assays for rapid detection and quantification of 2-MIB-producing cyanobacteria without DNA extraction to detect 2-MIB cyclase gene (mtc). Pseudanabaena foetida strain 1705-12 (Lake Kasumigaura), strain 1803-12 (Lake Kasumigaura), and strain PTG (Lake Biwa) of 2-MIB-producing cyanobacteria were used in the study. The positive correlation between the results of whole-cell PCR, whole-cell qPCR and chlorophyll a (Chl.a), and gene abundances illustrated that whole-cell PCR and whole-cell qPCR assays could rapidly and conveniently detect and quantify 2-MIB-producing cyanobacteria. Thus, this study provides a valuable tool for prediction of T&O events in drinking water and freshwater fishery.
{"title":"Development of a Quantification and Detection Method for 2-MIB-producing Cyanobacteria","authors":"Ji Zhang, Qingyue Shen, Hanchen Miao, Qintong Li, Marie Shimada, Tian Yuan, M. Utsumi, Z. Lei, Zhenya Zhang, H. Takanashi, Naoshi Fujimoto, S. Ichise, Yasuhiro Asada, O. Nishimura, M. Akiba, K. Shimizu","doi":"10.4194/trjfas21811","DOIUrl":"https://doi.org/10.4194/trjfas21811","url":null,"abstract":"Consumers often complain about taste and odor (T&O) in drinking water and freshwater fishery. One of the common T&O compounds, 2-methylisoborneol (2-MIB), can be detected by humans even when the concentration is below 10 ng/L. A forecast method of T&O occurrence is required to control drinking water plants and fishery farms to determine the timing of exchange of activated carbon or exchange the water in earthy pond. Traditional monitoring methods such as PCR, microscopy, and chemical analysis require a long time, are high in cost, and have a complex operation. We conducted this study to develop whole-cell PCR and whole-cell qPCR assays for rapid detection and quantification of 2-MIB-producing cyanobacteria without DNA extraction to detect 2-MIB cyclase gene (mtc). Pseudanabaena foetida strain 1705-12 (Lake Kasumigaura), strain 1803-12 (Lake Kasumigaura), and strain PTG (Lake Biwa) of 2-MIB-producing cyanobacteria were used in the study. The positive correlation between the results of whole-cell PCR, whole-cell qPCR and chlorophyll a (Chl.a), and gene abundances illustrated that whole-cell PCR and whole-cell qPCR assays could rapidly and conveniently detect and quantify 2-MIB-producing cyanobacteria. Thus, this study provides a valuable tool for prediction of T&O events in drinking water and freshwater fishery.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47660386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the Mediterranean Sea, European pilchard Sardina pilchardus and European anchovy Engraulis encrasicolus are the most important small pelagic fish regarding their ecological role, and revenue. Here, we perform a comprehensive assessment of length-based methods for those small pelagics from İzmir Bay, Aegean Sea. Therefore, the Length-based Bayesian Estimator and Length-based Spawning Potential Ratio were used to evaluate the stock structure and status of two important small pelagic fish. The length range for Sardina pilchardus was from 7.1 cm to 17.3 cm in TL. The ratios Lmean/Lopt and Lc/Lc_opt were over 1, suggesting truncated length structure and fishing of not too small individuals. The proportion of mature individuals in the catch was far less than half (36%) suggesting that in these fisheries catch consists mostly of immature individuals. The length range for Engraulis encrasicolus was from 5 cm to 15 cm in TL. The ratios Lmean/Lopt and Lc/Lc_opt were over 1 (1.2 and 1.3, respectively), suggesting truncated length structure and fishing of large individuals. The proportion of mature individuals in the catch was over half (52%) suggesting that in these fisheries catch consists of adults. The estimated sizes at median 50% selectivity (SL50) for S. pilchardus (11.1 cm) was ∼0.6 cm shorter than its lengths at 50% maturity (L50) of 11.7 cm, which indicates that a large proportion of the catch was immature. The median estimate of the spawning potential ratio was ∼0.19 for S. pilchardus and ∼0.48 for E. encrasicolus.
{"title":"Length Based Assessments for European Pilchard Sardina pilchardus and European Anchovy Engraulis encrasicolus, in the İzmir Bay, Aegean Sea","authors":"Z. Tosunoğlu, A. M. Şenbahar, N. Demirel","doi":"10.4194/trjfas21901","DOIUrl":"https://doi.org/10.4194/trjfas21901","url":null,"abstract":"In the Mediterranean Sea, European pilchard Sardina pilchardus and European anchovy Engraulis encrasicolus are the most important small pelagic fish regarding their ecological role, and revenue. Here, we perform a comprehensive assessment of length-based methods for those small pelagics from İzmir Bay, Aegean Sea. Therefore, the Length-based Bayesian Estimator and Length-based Spawning Potential Ratio were used to evaluate the stock structure and status of two important small pelagic fish. The length range for Sardina pilchardus was from 7.1 cm to 17.3 cm in TL. The ratios Lmean/Lopt and Lc/Lc_opt were over 1, suggesting truncated length structure and fishing of not too small individuals. The proportion of mature individuals in the catch was far less than half (36%) suggesting that in these fisheries catch consists mostly of immature individuals. The length range for Engraulis encrasicolus was from 5 cm to 15 cm in TL. The ratios Lmean/Lopt and Lc/Lc_opt were over 1 (1.2 and 1.3, respectively), suggesting truncated length structure and fishing of large individuals. The proportion of mature individuals in the catch was over half (52%) suggesting that in these fisheries catch consists of adults. The estimated sizes at median 50% selectivity (SL50) for S. pilchardus (11.1 cm) was ∼0.6 cm shorter than its lengths at 50% maturity (L50) of 11.7 cm, which indicates that a large proportion of the catch was immature. The median estimate of the spawning potential ratio was ∼0.19 for S. pilchardus and ∼0.48 for E. encrasicolus.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47118424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carlos Torres-Bayona, J. Rojas, R. Fernandez, M. Prieto-Guevara, Alexander Pulido, I. Moreno-Garrido
Genus Vibrio is involved in common pathologies of aquaculture fish species, being responsible for significant economic losses for that industrial activity. Microalgae and cyanobacteria have demonstrated to count on bioactive compounds able to diminish mortality and morbidity by their use as functional food supply or by addition of those bioactive compounds previously purified. The main goal of this work has been to evaluate the anti-microbian effect (growth of bacterial population measured as changes in optical density) of 25 microalgae extracts on the bacterial strain Vibrio anguillarum CECT 522T. Stock microalgae extracts were obtained from lyophilized biomass treated with methanol 99.9%. A total of thirteen extracts exhibited antibacterial activity. The highest activity corresponded to Monochrysis lutheri, followed by Hemiselmis cyclopea, Porphyridium cruentum, Tetraselmis rubens, Cryptomonas sp, Navicula sp. The anti-bacterial activity was not related to a taxonomic group, indicating species-specific or even strain-specific activity.
{"title":"Microalgae and Cyanobacteria, a Promising Source of Antimicrobial Molecules Against Aquatic Pathogen","authors":"Carlos Torres-Bayona, J. Rojas, R. Fernandez, M. Prieto-Guevara, Alexander Pulido, I. Moreno-Garrido","doi":"10.4194/trjfas21184","DOIUrl":"https://doi.org/10.4194/trjfas21184","url":null,"abstract":"Genus Vibrio is involved in common pathologies of aquaculture fish species, being responsible for significant economic losses for that industrial activity. Microalgae and cyanobacteria have demonstrated to count on bioactive compounds able to diminish mortality and morbidity by their use as functional food supply or by addition of those bioactive compounds previously purified. The main goal of this work has been to evaluate the anti-microbian effect (growth of bacterial population measured as changes in optical density) of 25 microalgae extracts on the bacterial strain Vibrio anguillarum CECT 522T. Stock microalgae extracts were obtained from lyophilized biomass treated with methanol 99.9%. A total of thirteen extracts exhibited antibacterial activity. The highest activity corresponded to Monochrysis lutheri, followed by Hemiselmis cyclopea, Porphyridium cruentum, Tetraselmis rubens, Cryptomonas sp, Navicula sp. The anti-bacterial activity was not related to a taxonomic group, indicating species-specific or even strain-specific activity.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46717992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Domínguez-May, E. Gasca-Leyva, G. Poot-López, M. Araneda
This study displays the application of the quantile regression theory to predict the size heterogeneity of cultured organisms. The analysis was applied to empirical data of the tilapia cultured in freshwater. Tilapia was cultured at four diets (50%, 80%, 100%, and Satiation). The quantile regression (QR) demonstrated to successfully model the size heterogeneity in tilapia (p<0,05; u<0,20), due to the feeding strategies effect. These results indicate tilapia fed an 80% ration size simulated a maximum biomass of 2,345.17 and 2,853.38kg at the harvest size of 200-300g (at 180 days) and 300-400g (at 210 days). The simulation of the quantile curves at a higher production scale allowed an estimate of the biomass distribution according to different market sizes, this strengthens management decision making in tilapia aquaculture. Implications of quantile regression and size heterogeneity in aquaculture are presented here.
{"title":"Heterogeneous Growth Prediction in Farmed Tilapia","authors":"R. Domínguez-May, E. Gasca-Leyva, G. Poot-López, M. Araneda","doi":"10.4194/trjfas21356","DOIUrl":"https://doi.org/10.4194/trjfas21356","url":null,"abstract":"This study displays the application of the quantile regression theory to predict the size heterogeneity of cultured organisms. The analysis was applied to empirical data of the tilapia cultured in freshwater. Tilapia was cultured at four diets (50%, 80%, 100%, and Satiation). The quantile regression (QR) demonstrated to successfully model the size heterogeneity in tilapia (p<0,05; u<0,20), due to the feeding strategies effect. These results indicate tilapia fed an 80% ration size simulated a maximum biomass of 2,345.17 and 2,853.38kg at the harvest size of 200-300g (at 180 days) and 300-400g (at 210 days). The simulation of the quantile curves at a higher production scale allowed an estimate of the biomass distribution according to different market sizes, this strengthens management decision making in tilapia aquaculture. Implications of quantile regression and size heterogeneity in aquaculture are presented here.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43879748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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