Environmental amelioration in biofloc based rearing system of white leg shrimp (Litopenaeus vannamei) in West Bengal, India

IF 1.5 4区农林科学 Q3 FISHERIES

Aquatic Living Resources Pub Date : 2021-01-01 DOI:10.1051/ALR/2021016

S. Das, A. Mandal

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引用次数: 8

Abstract

The potential of biofloc media in in-situ environmental amelioration mediated through the removal of nitrogenous metabolites, reduce the dominance of disease-causing Vibrio to beneficial Bacillus community and reduction of costly commercial feed was investigated in white leg shellfish (Litopenaeus vannamei) farming. Three treatments viz. biofloc without neem + commercial feed (B), biofloc with neem +commercial feed (NB), only commercial feed without biofloc (F)and, one control (C) withno biofloc and no feed in triplicate was applied with a stocking density of 60 PL-20 m−3 in outdoor earthen ponds (1000 m3). Two biofloc media (C:N = 15–10:1) with and without neem leave extract were applied with reduction of feed supplement from 50% to 100%. The significant difference was observed in final body weight (33.82 ± 0.18 g) in neem based biofloc media than the other tested shrimp with the survival percentage above 87%. Superiority of biofloc based rearing system over the traditional feed based one was established as live weight gain was 28.48–137% more with a reduction of feed conversion ratio by 7.60% to 8.18% in the former. Moreover, feed cost was reduced both in B (8.1%) and NB (8.77%) compared to conventional feed −based culture system (F). The nutrient profile of floc and shrimp also improved as higher protein content was recorded in floc (18.65–19.63%) and shrimp (24.58–26.29%). The development of biofloc within the culture system resulted in cumulative increase of Bacillus population with concomitant decrease of luminous Vibrio population. The findings of the study strongly indicated that biofloc technology could be a potential tool of ecosystem approach towards in-situ environmental amelioration in shrimp farming ponds with substantial reduction of cost towards feed, aqua chemicals used for disease and environmental health management and other operational cost like water exchange.

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印度西孟加拉邦凡纳滨对虾(Litopenaeus vannamei)生物群落养殖系统的环境改良

通过去除含氮代谢物、降低致病弧菌对有益芽孢杆菌群落的优势以及降低昂贵的商品饲料，研究了生物絮团培养基在白腿贝类养殖中的原位环境改善潜力。在室外土池(1000 m3)中采用放养密度为60 ml -20 m−3的3个处理，即不含楝树+商品饲料的生物絮团(B)、含楝树+商品饲料的生物絮团(NB)、只含不含生物絮团的商品饲料(F)和不含生物絮团和不含饲料的对照(C)。添加和不添加印楝叶提取物的两种生物絮团培养基(C:N = 15-10:1)，将饲料添加量从50%减少到100%。印楝生物絮体培养基与其他试验对虾的最终体重(33.82±0.18 g)差异显著，成活率均在87%以上。结果表明，基于生物絮团的饲养方式优于传统饲料饲养方式，其活重提高28.48 ~ 137%，饲料系数降低7.60% ~ 8.18%。此外，与传统的以饲料为基础的养殖体系(F)相比，B和NB的饲料成本分别降低了8.1%和8.77%。由于絮体(18.65 ~ 19.63%)和对虾(24.58 ~ 26.29%)的蛋白质含量较高，絮体和对虾的营养成分也有所改善。培养系统内生物絮团的发育导致芽孢杆菌种群的累积增加，同时发光弧菌种群的减少。研究结果强烈表明，生物絮团技术可以作为生态系统方法的潜在工具，用于对虾养殖池塘的原位环境改善，大幅降低饲料成本、用于疾病和环境健康管理的水化学品成本以及水交换等其他运营成本。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Aquatic Living Resources 农林科学-海洋与淡水生物学

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>24 weeks

期刊介绍： Aquatic Living Resources publishes original research papers, review articles and propective notes dealing with all exploited (i.e. fished or farmed) living resources in marine, brackish and freshwater environments. Priority is given to ecosystem-based approaches to the study of fishery and aquaculture social-ecological systems, including biological, ecological, economic and social dimensions. Research on the development of interdisciplinary methods and tools which can usefully support the design, implementation and evaluation of alternative management strategies for fisheries and/or aquaculture systems at different scales is particularly welcome by the journal. This includes the exploration of scenarios and strategies for the conservation of aquatic biodiversity and research relating to the development of integrated assessment approaches aimed at ensuring sustainable and high quality uses of aquatic living resources.