Farming of giant freshwater prawn (Macrobrachium rosenbergii) in Bagerhat, Bangladesh

The study was carried out to know the present status of Macrobrachium rosenbergii culture in Bagerhat district, Bangladesh from March 2012 to January 2013. Education levels  of farmers were found as illiterate (12.3%), primary (36.19%), secondary (20%), SSC (13.33%), HSC (12.38%) and graduate (5.71%). M. rosenbergii culture was the primary and secondary occupation of 80% and 20% farmers respectively. Average stocking density and production in extensive, improved extensive and semi-intensive culture were 9609, 11502 and 22847 per ha and 193, 284 and 488 kg/ha/year respectively; rearing period ranges from 6-10 months and survival rate varied from 55 to 60%. In improved extensive and semi-intensive culture 82.86% and 71.43% farmers applied farm-made feed instead of company feeds respectively and 11.43% and 37.14% farmers used both feeds. 91.43%, 80% and 68.57% respondents responded on normal to high mortality in extensive, improved extensive and semi-intensive culture respectively. Lack of finance and appropriate technology, scarcity of quality PL, diseases and inadequate extension work were major problems of prawn culture

Review of the current situation, problems, and challenges in fish seed production and supply for Bangladesh's aquaculture development

Fish seed are important for the growth of aquaculture in Bangladesh, but there are many challenges associated with supplying quality fish seed. This review evaluated the current level of production, issues and challenges that are affecting the production of fish seed in Bangladesh. The fish hatchery was found to be the major contributor in terms of fish seed production. Out of 671 metric tons of fish seed produced in 2020–2021, above 99% were from hatcheries. Freshwater finfish hatcheries have expanded over the last 30 yr, and are distributed throughout the country, but there is no commercial hatchery for coastal and marine water finfish species in the country. Shrimp and prawn hatcheries are concentrated in Cox's Bazar and the greater Jassore regions, respectively, while crab culture is entirely dependent on wild capture. Crablets are collected from nature, which has a devastating impact on biodiversity and wild stocks. The fish seed value chain is multidirectional and interlinked, and intermediaries dominate the supply chain. Disease outbreaks and indiscriminate use of chemicals are major concerns in fish seed production. Management strategies such as the introduction of certification, training programs, technology transfer, access to credit, and implementation of the law could improve the quality and productivity of fish seed in Bangladesh

Dietary inclusion effect of various sources of phyto-additives on the growth performance of olive flounder (Paralichthys olivaceus), and challenge test against Edwardsiella piscicida

Inclusion of various sources of additive in aquafeeds is practically helpful to elevate growth performance and disease resistance of aquatic animals. An 8-week feeding trial was conducted to determine inclusion effects of phyto-additives (yacon, ginger, and blueberry) into diets on olive flounder growth, feed utilization, chemical composition, and plasma chemistry, and challenge test against Edwardsiella piscicida in comparison to a commercial probiotic (Super lacto®). Six hundred juvenile olive flounder were randomly assigned into fifteen, 50 L flow-through tanks (40 fish per tank). Five experimental diets were formulated. No additive was included in the control (Con) diet. One percent of yacon, ginger, and blueberry powders, and 0.5% Super lacto® were included at the expense of wheat flour, and water in the Con diet referred to as the YCP, GGP, BBP, and SUP diets, respectively. All experimental diets were hand-fed to triplicate groups of fish twice a day until they visually satiated for a period of 8 weeks. Following the 4- and 8-week feeding trials, 10 and 20 fish were taken from each tank, artificially infected with E. piscicida, and then survival was monitored for the next 6, and 8 days after infection, respectively. At the end of the 8-week feeding trial, no significant difference was observed in weight gain, feed consumption, feed utilization, chemical composition, and plasma chemistry of olive flounder. However, survival of fish fed the GGP diet was significantly (p < 0.004, and p < 0.02, respectively) higher than that of fish fed the SUP, BBP, and Con diets, and SUP and Con diets after the 4- and 8-week feeding trials, respectively, according to the Kaplan-Meier survival curve. In conclusion, phyto-additive, especially GG can be used as an effective immunostimulant in olive flounder diet at occurrence of E. piscicida.|배합사료 내 사료첨가제를 공급하는 것은 수생동물의 성장과 질병 저항성을 향상시키는데 실질적인 도움이 된다. 다양한 식물성 원료인 야콘, 생강과 블루베리의 첨가에 따른 넙치의 성장, 사료이용성, 체조성, 혈액학적 성상 및 Edwardsiella picicida 공격성에 미치는 효과를 상업용 프로바이오틱스(슈퍼락토)와 비교하기 위하여 8주간의 사육실험을 수행하였다. 총 600 마리의 넙치 치어를 15개의 50 L 유수식수조에 각각 40마리씩 무작위로 분산 수용하였다. 대조구사료(Con)를 포함한 5종류의 실험용 배합사료를 준비하였다. 대조구사료는 사료 내 어떠한 사료첨가제도 포함시키지 않았으며, 대조구사료 내 소맥분과 물을 각각 1%의 야콘, 생강과 블루베리 분말 및 0.5% 슈퍼락토로 대체하여 제조하고, 이를 각각 YCP, GGP, BBP 및 SUP 사료로 명명하였다. 각 실험사료는 3반복구를 두었다. 모든 실험사료는 손으로 매일 1일 2회 만복시까지 공급하였으며, 총 8주간 공급하였다. 사육실험 시작 후, 4주차와 사육 실험이 종료된 8주차에는 각 수조에서 10마리와 20마리의 넙치 치어를 무작위로 선택하여 E. piscicida로 인위적인 감염을 시켰으며, 감염 이후 6일과 8일 동안 각각의 생존율을 관찰하였다. 8주간의 사육실험 종료 시, 어체 증체량, 일일성장율, 사료 공급양, 사료이용성, 체조성 및 혈액학적성상에는 실험구간에 유의적인 차이가 없었다. 그러나, Kaplan-Meier 생존율 곡선 분석에 따르면, 4주 사육실험 종료 시에는 GGP사료를 공급한 넙치의 생존율은 SUP사료, BBP사료와 대조구사료를 공급한 넙치보다 높은 생존율을 보였다. 또한 8주간의 사육실험 시에도 GGP사료를 공급한 넙치의 생존율이 SUP사료와 대조구사료를 공급한 넙치보다 높았다. 이상의 결과를 고러할 때, 식물성 사료첨가제, 특히 생강의 첨가는 넙치용 배합사료내 E. piscicida 발병으로 인한 넙치의 폐사율을 감소시키는데 아주 효과적인 것으로 판단된다.1. Introduction 1 2. Materials and Methods 5 2.1 Collection of fish and rearing conditions 5 2.2 Experimental diet preparation 5 2.3 Measuring performance of the experimental fish 8 2.4 Chemical analysis of the experimental diets and fish 8 2.5 Analysis of plasma chemistry of the experimental fish 8 2.6 Challenge test 9 2.7 Statistical analysis 9 3. Results 10 3.1 Survival and growth performance of the fish at the end of the 8-week feeding trial 10 3.2 Feed consumption and feed utilization of the fish 10 3.3 Chemical composition of the whole body of fish 10 3.4 Plasma chemistry of fish at the end of the 8-week feeding trial 10 3.5 Challenge test of the fish at the end of the 4- and 8-week feeding trials 15 4. Discussion 18 5. Conclusion 23 Acknowledgements 24 References 25 Abstract (in Korean) 36Maste

Evaluation of Meat Meal as a Replacer for Fish Meal in Diet on Growth Performance, Feed Utilization, Chemical Composition, Hematology, and Innate Immune Responses of Olive Flounder (<i>Paralichthys olivaceus</i>)

This study aims to evaluate the dietary replacement effect of various levels of fish meal (FM) with meat meal (MM) on the growth, feed utilization, chemical composition, hematological parameters, and innate immune responses of olive flounder. A total of 360 juvenile fish (initial weight of 14.7 g) were randomly assigned to 18 flow-through containers. The control (MM0) diet included 65% FM. Then, 10%, 20%, 30%, 40%, and 50% FM in the MM0 diet were replaced with MM, referred to as the MM10, MM20, MM30, MM40, and MM50 diets, respectively. The fish were hand-fed to satiation daily for 56 days. Weight gain, the specific growth rate, the feed efficiency ratio, and the protein efficiency ratio of fish fed the MM0 diet were statistically greater than those of fish fed the MM30, MM40, and MM50 diets, but not statistically different from those of fish fed the MM10 and MM20 diets. To incite the maximum values of weight gain and the specific growth rate (SGR) of the fish, an estimated 7.0% of FM substitution with MM in diets was required according to regression analysis. However, the feed consumption, protein retention, hematological parameters, and innate immune (superoxide dismutase and lysozyme activities) responses of the fish were not statistically impacted by the dietary replacement levels of MM for FM. In conclusion, the feed ingredient grade of MM can substitute FM by up to 20% in the diet without causing any negative impact on the growth, feed consumption, feed utilization, or innate immune responses of olive flounder

Efficacy of using sunflower meal as an ingredient, and partial fishmeal‐replacer, in practical feed formulated for stinging catfish (Heteropneustes fossilis)

Abstract This study was conducted to determine the growth performance, body composition, and haematological profile of Heteropneustes fossilis in response to the replacement of fish meal (FM) by sunflower meal (SFM). The experiment was conducted in a completely randomized design (CRD) with five treatments and three replications. The fish (initial average body weight of 2.42 ± 0.01 g) were reared in 15 glass aquaria (40 fish/aquarium) with a 150‐L water capacity. Five isoproteic (35%) diets were prepared by replacing FM protein with SFM protein at a rate of 0% (T0), 10% (T10), 20% (T20), 30% (T30), and 40% (T40). Fish were fed with experimental diet twice a day (9.00 and 16.00), 7 days a week for 8 weeks. Fish were sampled at the end of the experimental period of 8 weeks. At the end of the rearing period, the highest weight gain (6.25 ± 0.11g), % weight gain (163.32%), and specific growth rate (1.61 ± 0.03%/day) were observed in the control (T0) treatment, but the difference was not significant (p > 0.05) with T10 and T20 treatments. However, all the growth factors were decreased with the further inclusion level of SFM in replacement of FM, and the lowest growth performance was observed in T40 treatment. The protein efficiency ratio (PER) and feed conversion ratio (FCR) followed the same pattern as the growth parameters. It was found that the whole‐body proximate composition of fish was also affected significantly (p < 0.05). Haematological parameters significantly (P < 0.05) altered at 30% and 40% levels of replacement of FM with SFM. Based on these results, it can be concluded that 20% FM protein can be substituted with SFM protein in the diet of H. fossilis without compromising growth performance, feed utilization, chemical composition, and haematological status. However, according to polynomial regression analysis, the optimum level of replacement of FM protein with SFM protein was determined to be 14.3% in the diet of H. fossilis