High feed cost is a major problem for the promotion of a nutrient rich fish like Gangetic mystus (Mystus cavasius) in cages under floodplain ecosystem. To address this problem, production and economics of cage farming of Gangetic mystus were evaluated under different feed restriction periods in Atrai River of Chalan Beel. Four feed restriction periods were tested in floating cages under four different treatments (T1-0 day i.e., regular feeding, T2-1 day, T3-2 days, and T4-3 days feed restriction per week). Fish were fed twice daily with commercial floating pellet containing 32% protein. Water quality parameters (water temperature, dissolved oxygen, pH and ammonia-nitrogen) were within the suitable range for fish culture. Final weight, weight gain, % weight gain, average daily gain, specific growth rate and survival rate were found significantly higher at treatment T1 whereas a better feed conversion ratio was observed in T2. Significantly higher fish production and benefit were also obtained from treatment T2. The present study concluded that Gangetic mystus with a stocking density of 50 fish m–3 fed with 32% protein containing feed maintaining 1 day feeding restriction per week are economically feasible for cage culture in running water.
饲料成本高是影响河漫滩生态系统下恒河墨鱼(mystus cavasius)等营养丰富鱼类网箱养殖的主要问题。为解决这一问题，对查兰比勒阿特拉伊河不同限饲期下网箱养殖恒河鼠的产量和经济性进行了评价。在浮式网箱中进行4个限饲期试验，采用4种不同处理(每周T1-0天即常规饲养、T2-1天、T3-2天、T4-3天)。鱼每天喂两次含32%蛋白质的商业浮动颗粒。水质参数(水温、溶解氧、pH、氨氮)均在适宜养殖范围内。T1处理的末重、增重、%增重、平均日增重、特定生长率和成活率显著提高，T2处理的饲料系数显著提高。处理T2也显著提高了鱼产量和效益。本研究认为，以50尾m-3的放养密度饲喂含蛋白32%的饲料，维持1 d /周的限饲，在自来水网箱养殖中是经济可行的。
{"title":"Production and economics of Gangetic mystus (Mystus cavasius) farming under different feed restriction periods in cages of floodplain ecosystem","authors":"Jesmin Ara, Md. Akhtar Hossain, Md. Abu Sayed Jewel, Md. Ayenuddin Haque","doi":"10.17017/j.fish.580","DOIUrl":"https://doi.org/10.17017/j.fish.580","url":null,"abstract":"High feed cost is a major problem for the promotion of a nutrient rich fish like Gangetic mystus (Mystus cavasius) in cages under floodplain ecosystem. To address this problem, production and economics of cage farming of Gangetic mystus were evaluated under different feed restriction periods in Atrai River of Chalan Beel. Four feed restriction periods were tested in floating cages under four different treatments (T1-0 day i.e., regular feeding, T2-1 day, T3-2 days, and T4-3 days feed restriction per week). Fish were fed twice daily with commercial floating pellet containing 32% protein. Water quality parameters (water temperature, dissolved oxygen, pH and ammonia-nitrogen) were within the suitable range for fish culture. Final weight, weight gain, % weight gain, average daily gain, specific growth rate and survival rate were found significantly higher at treatment T1 whereas a better feed conversion ratio was observed in T2. Significantly higher fish production and benefit were also obtained from treatment T2. The present study concluded that Gangetic mystus with a stocking density of 50 fish m–3 fed with 32% protein containing feed maintaining 1 day feeding restriction per week are economically feasible for cage culture in running water.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931506","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}
Since 2008, the quantity and size of silky shark, Carcharhinus falciformis decrease drastically in catches of artisanal driftnet fishery operating in the coastal waters off Côte d’Ivoire. The objective of this study was to describe the reproductive biology of this species, based on 336 specimens (162 males and 174 females). The total length (TL) of males and female ranged from 81–242 and 79–254 cm respectively. The sex ratio was 0.89:1 (M:F) and 0.93:1 (M:F) in embryos and adults respectively. Males of >180 cm had calcified clasper (17–35 cm) whereas females of >190 cm had oviduct gland length of 18–47 mm. The estimated length at first maturity was 182.8 cm for males and 195.2 cm for females. The range in litter size of three gravid females was 7–9, with an average of 8 embryos of 52–54.5 cm TL were collected in August and December. However, the absence of neonates and scars on females' body, as well as ovulating and differentiating females in catches does not allow a clear determination of its reproductive period in Ivorian waters and therefore, additional research including histological analysis is necessary to better understand the process of spawning of silky shark.
{"title":"Reproductive biology of the silky shark Carcharhinus falciformis (Müller & Henle, 1839) in waters off Côte d’Ivoire (West Africa)","authors":"Koua Clément N’Gouan, Kouadio Justin Konan, Kouassi Yves Narcisse Kouamé, Oi Edia Edia","doi":"10.17017/j.fish.503","DOIUrl":"https://doi.org/10.17017/j.fish.503","url":null,"abstract":"Since 2008, the quantity and size of silky shark, Carcharhinus falciformis decrease drastically in catches of artisanal driftnet fishery operating in the coastal waters off Côte d’Ivoire. The objective of this study was to describe the reproductive biology of this species, based on 336 specimens (162 males and 174 females). The total length (TL) of males and female ranged from 81–242 and 79–254 cm respectively. The sex ratio was 0.89:1 (M:F) and 0.93:1 (M:F) in embryos and adults respectively. Males of >180 cm had calcified clasper (17–35 cm) whereas females of >190 cm had oviduct gland length of 18–47 mm. The estimated length at first maturity was 182.8 cm for males and 195.2 cm for females. The range in litter size of three gravid females was 7–9, with an average of 8 embryos of 52–54.5 cm TL were collected in August and December. However, the absence of neonates and scars on females' body, as well as ovulating and differentiating females in catches does not allow a clear determination of its reproductive period in Ivorian waters and therefore, additional research including histological analysis is necessary to better understand the process of spawning of silky shark.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134907225","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}
Shahidul Islam Bhuiya, Roni Chandra Mondal, Fozlul Kabeer, AKM Nowsad Alam
Ensuring a consistent supply of uniformly sized fingerlings for tilapia cage aquaculture in Bangladesh's poses a significant challenge. This study assessed overwintering growth performance and economic viability of monosex tilapia fingerling production in haor waters. Nine hapas, each inside a designated treatment cage, were stocked with T1 (200), T2 (250) and T3 (300) tilapia fry, averaging 1.25±0.25 g, per m³ for 90 days. The most successful treatment continued for two subsequent crops over two years for economic viability assessment. Average final body weight gain was the highest at the lowest stocking density (T1, 58.86±7.23 g), but the most desirable biomass gain (222 kg cage⁻¹) occurred at medium stocking density (T2). Beyond biomass gain, T2 exhibited superior profitability, with 26% and 30% profitability in the second and third crops respectively, over total costs. In conclusion, overwintering tilapia fingerling production in the hapa-cum-cage system at a stocking density of 250 m⁻³ proved more profitable and sustainable than other treatments, offering a viable income-generating option for resource-poor haor fishers.
{"title":"Determining overwintering performance and economic viability of monosex tilapia fingerling production in hapa cum cage aquaculture system for Bangladesh's haor fishers","authors":"Shahidul Islam Bhuiya, Roni Chandra Mondal, Fozlul Kabeer, AKM Nowsad Alam","doi":"10.17017/j.fish.613","DOIUrl":"https://doi.org/10.17017/j.fish.613","url":null,"abstract":"Ensuring a consistent supply of uniformly sized fingerlings for tilapia cage aquaculture in Bangladesh's poses a significant challenge. This study assessed overwintering growth performance and economic viability of monosex tilapia fingerling production in haor waters. Nine hapas, each inside a designated treatment cage, were stocked with T1 (200), T2 (250) and T3 (300) tilapia fry, averaging 1.25±0.25 g, per m³ for 90 days. The most successful treatment continued for two subsequent crops over two years for economic viability assessment. Average final body weight gain was the highest at the lowest stocking density (T1, 58.86±7.23 g), but the most desirable biomass gain (222 kg cage⁻¹) occurred at medium stocking density (T2). Beyond biomass gain, T2 exhibited superior profitability, with 26% and 30% profitability in the second and third crops respectively, over total costs. In conclusion, overwintering tilapia fingerling production in the hapa-cum-cage system at a stocking density of 250 m⁻³ proved more profitable and sustainable than other treatments, offering a viable income-generating option for resource-poor haor fishers.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"33 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134905916","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}
Sedation of fish before handling and transporting can help curtail undue stress that can affect their health. This study investigated the effectiveness of sodium bicarbonate (NaHCO3) utilised as an anaesthetic agent for common carp (Cyprinus carpio) with an average weight of 13.5 ± 0.55 g. The experimental fish were grouped and exposed to different concentrations at 0, 40, 45 and 50 g L–1 of NaHCO3 dissolved in water. Fishes were bath-immersed in different concentrations of NaHCO3 solution until such time that they became anesthetised. Results showed that induction time and recovery time increases with increasing NaHCO3 concentration. All fish reached complete anaesthesia in more than 3 minutes under a higher concentration of 50 g L–1. No mortality occurred under any of the concentrations tested. The most optimal concentration leading to complete anaesthesia in 2 minutes and recovery in less than 4 minutes was 45 g L–1. This study showed that NaHCO3 is a potential fish anaesthetic for the common carp.
在处理和运输之前对鱼进行镇静可以帮助减少可能影响其健康的过度压力。研究了碳酸氢钠(NaHCO3)对平均体重为13.5±0.55 g的鲤鱼(Cyprinus carpio)的麻醉效果。将实验鱼分组，分别暴露于0、40、45和50 g L-1的NaHCO3水溶液中。鱼被浸泡在不同浓度的NaHCO3溶液中，直到它们被麻醉。结果表明，诱导时间和恢复时间随NaHCO3浓度的增加而增加。在50g L-1的较高浓度下，所有鱼在3分钟以上达到完全麻醉。在任何测试浓度下均未发生死亡。在2分钟内完全麻醉并在不到4分钟内恢复的最佳浓度为45 g L-1。本研究表明，NaHCO3是鲤鱼潜在的鱼类麻醉剂。
{"title":"Anaesthetic effects of different concentrations of sodium bicarbonate on common carp (Cyprinus carpio)","authors":"Leah Joyce B. Gajutos, Aurelia B. Gajutos","doi":"10.17017/j.fish.425","DOIUrl":"https://doi.org/10.17017/j.fish.425","url":null,"abstract":"Sedation of fish before handling and transporting can help curtail undue stress that can affect their health. This study investigated the effectiveness of sodium bicarbonate (NaHCO3) utilised as an anaesthetic agent for common carp (Cyprinus carpio) with an average weight of 13.5 ± 0.55 g. The experimental fish were grouped and exposed to different concentrations at 0, 40, 45 and 50 g L–1 of NaHCO3 dissolved in water. Fishes were bath-immersed in different concentrations of NaHCO3 solution until such time that they became anesthetised. Results showed that induction time and recovery time increases with increasing NaHCO3 concentration. All fish reached complete anaesthesia in more than 3 minutes under a higher concentration of 50 g L–1. No mortality occurred under any of the concentrations tested. The most optimal concentration leading to complete anaesthesia in 2 minutes and recovery in less than 4 minutes was 45 g L–1. This study showed that NaHCO3 is a potential fish anaesthetic for the common carp.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"11 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78248906","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}
Organoleptic qualities and proximate composition of fish grown in carp fattening pond were studied under three treatments of feed and fertiliser management. Treatment T1 was designed with the use of organic fertiliser and stocking of silver carp, T2 with both organic and inorganic fertilisers and silver carp and T3 with both organic and inorganic fertilisers but excluding silver carp. One day in a week feeding restriction was followed in all the treatments. Fishes were stocked with a stocking density of 2470 fishes ha–1. Three fishes (Gibelion catla, Labeo rohita and Cirrhinus cirrhosus) were selected for organoleptic and proximate assessment. Cyanobacteria along with total phytoplankton cell density was significantly higher at treatment T2 followed by T3 and T1. However, in terms of productivity (Chl-a) treatment T2 was 27.1 and 13.3% higher compared to T1 and T3 respectively. Parameters assessed for proximate composition analysis did not vary across treatments and organoleptic test revealed comparatively higher acceptability of fishes collected from treatment T1 followed by T2 and T3 for all the fishes. Overall acceptability was higher for L. rohita from treatment T1. This study concluded that, inorganic fertilisation along with silver carp can improve the organoleptic properties of carps in pond.
{"title":"Organoleptic qualities and proximate composition of fish grown in good aquaculture practice-based carp fattening pond","authors":"Md. Anwar Hossain, Md. Akhtar Hossain, Md. Ayenuddin Haque, Mst. Nurjahan Begum","doi":"10.17017/j.fish.505","DOIUrl":"https://doi.org/10.17017/j.fish.505","url":null,"abstract":"Organoleptic qualities and proximate composition of fish grown in carp fattening pond were studied under three treatments of feed and fertiliser management. Treatment T1 was designed with the use of organic fertiliser and stocking of silver carp, T2 with both organic and inorganic fertilisers and silver carp and T3 with both organic and inorganic fertilisers but excluding silver carp. One day in a week feeding restriction was followed in all the treatments. Fishes were stocked with a stocking density of 2470 fishes ha–1. Three fishes (Gibelion catla, Labeo rohita and Cirrhinus cirrhosus) were selected for organoleptic and proximate assessment. Cyanobacteria along with total phytoplankton cell density was significantly higher at treatment T2 followed by T3 and T1. However, in terms of productivity (Chl-a) treatment T2 was 27.1 and 13.3% higher compared to T1 and T3 respectively. Parameters assessed for proximate composition analysis did not vary across treatments and organoleptic test revealed comparatively higher acceptability of fishes collected from treatment T1 followed by T2 and T3 for all the fishes. Overall acceptability was higher for L. rohita from treatment T1. This study concluded that, inorganic fertilisation along with silver carp can improve the organoleptic properties of carps in pond.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88643860","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}
Saznzib Kumar Barman, Bhupal Ronjon Das, M. Kunda, S. Mazumder, Md Jasim Uddin, P. P. Barman
The current study compared the length-weight relationships and condition factors in mono- and mixed-sex Nile tilapia (Oreochromis niloticus). The trial lasted for 91 days and included two treatments with five replications for each, all with the same stocking density. During the study period, 20 randomly selected fish individuals were measured and recorded from each cage every two weeks. The observed growth trend was allometric, with no significant difference in the mean exponential values (b), 2.696 and 2.65 for mono and mixed-sex tilapia respectively. There was a significant difference in final weight gain between monosex (171.58±7.39 g) and mixed-sex (149.09±4.14 g) tilapia. There was no significant difference in final length between monosex (19.80±0.42 cm) and mixed-sex (19.80±0.42 cm) tilapia. Moreover, the mean correlation coefficient (r2) of both groups was positive. The Fulton condition factor (K) also varies from 0.700 to 1.000 (monosex) and 1.000 to 1.010 (mixed-sex). The relative condition factor (Kn) for monosex and mixed-sex tilapia ranged from 1.96 to 2.222 and 2.092 to 2.35 respectively, indicated good aquaculture conditions. The present findings will attract fish farmers to mixed-sex tilapia culture by allowing them to lessen hormone administration and expected to boost national fish production through open water cage aquaculture.
{"title":"Length-weight relationships and condition factors of mono- and mixed-sex Nile tilapia (Oreochromis niloticus) in open water cage culture system","authors":"Saznzib Kumar Barman, Bhupal Ronjon Das, M. Kunda, S. Mazumder, Md Jasim Uddin, P. P. Barman","doi":"10.17017/j.fish.431","DOIUrl":"https://doi.org/10.17017/j.fish.431","url":null,"abstract":"The current study compared the length-weight relationships and condition factors in mono- and mixed-sex Nile tilapia (Oreochromis niloticus). The trial lasted for 91 days and included two treatments with five replications for each, all with the same stocking density. During the study period, 20 randomly selected fish individuals were measured and recorded from each cage every two weeks. The observed growth trend was allometric, with no significant difference in the mean exponential values (b), 2.696 and 2.65 for mono and mixed-sex tilapia respectively. There was a significant difference in final weight gain between monosex (171.58±7.39 g) and mixed-sex (149.09±4.14 g) tilapia. There was no significant difference in final length between monosex (19.80±0.42 cm) and mixed-sex (19.80±0.42 cm) tilapia. Moreover, the mean correlation coefficient (r2) of both groups was positive. The Fulton condition factor (K) also varies from 0.700 to 1.000 (monosex) and 1.000 to 1.010 (mixed-sex). The relative condition factor (Kn) for monosex and mixed-sex tilapia ranged from 1.96 to 2.222 and 2.092 to 2.35 respectively, indicated good aquaculture conditions. The present findings will attract fish farmers to mixed-sex tilapia culture by allowing them to lessen hormone administration and expected to boost national fish production through open water cage aquaculture.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"28 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83856195","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}
C. P. P. de la Cruz, Leendel Paul B. Alap, E. Manalili, R. Rafael, P. D. H. Tolentino
The growth of the aquaculture sector leads to a demand for sustainable feed ingredients. Prebiotics are potential sustainable feed ingredients that can promote the improved performance of aquaculture species without the use of antimicrobials. This study investigated the potential of Azolla pinnata as a candidate prebiotic source. Prebiotic characteristics and dietary effect of commercial diet (CD) with varying pulverised azolla (PA) inclusion was evaluated. Results showed that PA (9.40% moisture) constitutes around 16.1% ash, 22.3% crude fibre, 20.9% crude protein, 1.7% crude fat and 29.6% nitrogen-free extract. Crude xylan and cellulose content of PA were 13.7% and 12.6% dry matter (DM) respectively. Growth of Lactobacillus rhamnosus in PA-supplemented MRS broth remarkably improved after 4 to 6 hours of incubation. Feeding trials results revealed that PA inclusion had no adverse effect on average survival of milkfish fingerlings, albeit significant improvement (p < 0.01) was noted in group fed with 2% PA-replaced CD in terms of the total weight gain (119.9%), specific growth rate (2.62% day–1) and feed efficiency (79.9%). The present study demonstrated the prebiotic activity of PA, as well as its potential use as dietary feed component for improved growth and feed efficiency of cultured milkfish.
{"title":"Prebiotic potential of Azolla pinnata (R.Br.) and dietary inclusion effect of pulverised azolla on the growth performance of milkfish fingerlings","authors":"C. P. P. de la Cruz, Leendel Paul B. Alap, E. Manalili, R. Rafael, P. D. H. Tolentino","doi":"10.17017/j.fish.384","DOIUrl":"https://doi.org/10.17017/j.fish.384","url":null,"abstract":"The growth of the aquaculture sector leads to a demand for sustainable feed ingredients. Prebiotics are potential sustainable feed ingredients that can promote the improved performance of aquaculture species without the use of antimicrobials. This study investigated the potential of Azolla pinnata as a candidate prebiotic source. Prebiotic characteristics and dietary effect of commercial diet (CD) with varying pulverised azolla (PA) inclusion was evaluated. Results showed that PA (9.40% moisture) constitutes around 16.1% ash, 22.3% crude fibre, 20.9% crude protein, 1.7% crude fat and 29.6% nitrogen-free extract. Crude xylan and cellulose content of PA were 13.7% and 12.6% dry matter (DM) respectively. Growth of Lactobacillus rhamnosus in PA-supplemented MRS broth remarkably improved after 4 to 6 hours of incubation. Feeding trials results revealed that PA inclusion had no adverse effect on average survival of milkfish fingerlings, albeit significant improvement (p < 0.01) was noted in group fed with 2% PA-replaced CD in terms of the total weight gain (119.9%), specific growth rate (2.62% day–1) and feed efficiency (79.9%). The present study demonstrated the prebiotic activity of PA, as well as its potential use as dietary feed component for improved growth and feed efficiency of cultured milkfish.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"5 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87382857","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 European sprat (Sprattus sprattus) represents the unit stock shared among the Black Sea countries. It has a key role in the Black Sea ecosystem and is determined by its importance from both a commercial and an ecological point of view. Up to now, there are few studies on the meristic, morphometric and genetic characteristics of this species. In this study, the species were specified and studied for meristic, morphometric and genetic characteristics. Mitochondrial gene regions which 16S rRNA and cytochrome c oxidase subunit I (COI), were studied and compared with some of the family Clupeidae species in the National Center for Biotechnology Information (NCBI) and the phylogenetic relationship was examined. A total of 14 haplotypes were determined for the mitochondrial COI gene region and 3 haplotypes were determined for the 16S rRNA gene region. This study will contribute to the sustainable management of this species as well as be a basis for future studies.
{"title":"The morphometric, meristic and genetic characteristics of European sprat (Sprattus sprattus) in the Black Sea","authors":"S. Ilhan, Z. Düzgüneş, N. Kasapoğlu","doi":"10.17017/j.fish.476","DOIUrl":"https://doi.org/10.17017/j.fish.476","url":null,"abstract":"The European sprat (Sprattus sprattus) represents the unit stock shared among the Black Sea countries. It has a key role in the Black Sea ecosystem and is determined by its importance from both a commercial and an ecological point of view. Up to now, there are few studies on the meristic, morphometric and genetic characteristics of this species. In this study, the species were specified and studied for meristic, morphometric and genetic characteristics. Mitochondrial gene regions which 16S rRNA and cytochrome c oxidase subunit I (COI), were studied and compared with some of the family Clupeidae species in the National Center for Biotechnology Information (NCBI) and the phylogenetic relationship was examined. A total of 14 haplotypes were determined for the mitochondrial COI gene region and 3 haplotypes were determined for the 16S rRNA gene region. This study will contribute to the sustainable management of this species as well as be a basis for future studies.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86459298","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}
D. Tadese, Gashaw Tesfaye, Metekia Tamiru, Lishan Alemu, F. Geda
The purpose of this study was to assess the effect of emodin on biochemical variables, antioxidant activity, heat shock protein gene expression and prawn intestinal morphology (Macrobrachium rosenbergii). Three feeds containing 0 mg kg–1 (T1, control group), 25 mg kg–1 (T2) and 50 mg kg–1 (T3) of emodin were formulated and fed for eight weeks. Alanine aminotransferase, total cholesterol and triglyceride contents were significantly lowered although glucose tended to increase following the emodin remedy. Superoxide dismutase variables in haemolymph were dramatically upgraded, whilst malondialdehyde and superoxide anion situations were significantly lowered when compared to control. Emodin supplementation had no influence on glutathione peroxidase contents. Emodin remedy dropped the expression of HSP60 and HSP90 genes in comparison to the control. In T2, the intestinal epithelial cells were complete, well-organised and tightly affixed to the basement membrane, in discrepancy to the slightly disunited basement membrane in the control group. The emodin-treated prawn individuals had a thicker and full intestinal morphology than the control groups. Supplementation with emodin at dosages of 25 mg kg–1 improved growth performance, blood biochemical, antioxidant capacity and immune gene expression.
{"title":"Effect of emodin on growth performance, antioxidant status, intestinal morphology and heat shock protein gene expressions of freshwater prawn (Macrobrachium rosenbergii)","authors":"D. Tadese, Gashaw Tesfaye, Metekia Tamiru, Lishan Alemu, F. Geda","doi":"10.17017/j.fish.436","DOIUrl":"https://doi.org/10.17017/j.fish.436","url":null,"abstract":"The purpose of this study was to assess the effect of emodin on biochemical variables, antioxidant activity, heat shock protein gene expression and prawn intestinal morphology (Macrobrachium rosenbergii). Three feeds containing 0 mg kg–1 (T1, control group), 25 mg kg–1 (T2) and 50 mg kg–1 (T3) of emodin were formulated and fed for eight weeks. Alanine aminotransferase, total cholesterol and triglyceride contents were significantly lowered although glucose tended to increase following the emodin remedy. Superoxide dismutase variables in haemolymph were dramatically upgraded, whilst malondialdehyde and superoxide anion situations were significantly lowered when compared to control. Emodin supplementation had no influence on glutathione peroxidase contents. Emodin remedy dropped the expression of HSP60 and HSP90 genes in comparison to the control. In T2, the intestinal epithelial cells were complete, well-organised and tightly affixed to the basement membrane, in discrepancy to the slightly disunited basement membrane in the control group. The emodin-treated prawn individuals had a thicker and full intestinal morphology than the control groups. Supplementation with emodin at dosages of 25 mg kg–1 improved growth performance, blood biochemical, antioxidant capacity and immune gene expression.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"240 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80469695","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}
F. Sughra, M. Hafeez-ur-Rehman, F. Abbas, I. Altaf, Zohal Hassan, A. Bhatti, Kashif Ali
The present study investigates pathogenicity of local Aeromonas hydrophila strains by molecular characterisation of two virulence factor genes: aerolysin (aerA) and haemolysin (Ahh1) using polymerase chain reaction (PCR) technique. Phenotypically identified presumptive Aeromonas isolates recovered from diseased Labeo rohita were genetically analysed using type-specific primers by amplifying 309 bp and 130 bp conserved regions of aerolysin and haemolysin genes respectively. The partial nucleotide sequences of aerA and Ahh1 were determined from representative strains in which aerA was confirmed in 75% isolates, whereas Ahh1 was confirmed in 50% isolates. The nucleotide blast results of the representative strains revealed close homology of 95% (aerolysin) and 97% (haemolysin) with published sequences.
{"title":"Molecular characterisation and genetic analysis of aerolysin and haemolysin in Aeromonas hydrophila isolated from diseased Labeo rohita by polymerase chain reaction","authors":"F. Sughra, M. Hafeez-ur-Rehman, F. Abbas, I. Altaf, Zohal Hassan, A. Bhatti, Kashif Ali","doi":"10.17017/j.fish.466","DOIUrl":"https://doi.org/10.17017/j.fish.466","url":null,"abstract":"The present study investigates pathogenicity of local Aeromonas hydrophila strains by molecular characterisation of two virulence factor genes: aerolysin (aerA) and haemolysin (Ahh1) using polymerase chain reaction (PCR) technique. Phenotypically identified presumptive Aeromonas isolates recovered from diseased Labeo rohita were genetically analysed using type-specific primers by amplifying 309 bp and 130 bp conserved regions of aerolysin and haemolysin genes respectively. The partial nucleotide sequences of aerA and Ahh1 were determined from representative strains in which aerA was confirmed in 75% isolates, whereas Ahh1 was confirmed in 50% isolates. The nucleotide blast results of the representative strains revealed close homology of 95% (aerolysin) and 97% (haemolysin) with published sequences.","PeriodicalId":55944,"journal":{"name":"Journal of Fisheries","volume":"5 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90187141","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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