在网箱中饲养尼罗罗非鱼（Oreochromis niloticus）鱼苗可以提高生长性能、饲料效率、条件因子和生长模式，从而提高种群数量

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research Pub Date : 2025-05-05 DOI:10.1016/j.jglr.2025.102587

Omega Anthony Vicent , Edmond Alavaisha , Samwel Mchele Limbu

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引用次数: 0

摘要

由于过度捕捞，尼罗罗非鱼（Oreochromis niloticus）对维多利亚湖周围粮食安全和生计的贡献正在减少。但是，由于缺乏资料，特别是关于适当的护理制度的资料，发展中国家将增加库存作为征聘过度开发的库存的另一种管理办法的应用受到限制。本研究测定了维多利亚湖尼罗罗非鱼苗种的生长性能、饲料利用率、成活率、条件因子和生长模式。对各系统的浮游植物组成、丰度和多样性也进行了评估。每个体系放生250尾鱼苗（平均体重0.63±0.12 g），每组3次，投喂商品饲料10周。结果表明：网箱育苗的末重（FW: 22.5±0.86 g）、日增重（DWG: 0.33±0.01 g/d）和特定生长率（SGR: 4.47±0.05%/d）显著高于池中育苗（FW: 16.4±0.23 g, DWG: 0.22±0.01 g/d, SGR: 4.04±0.01%/d）和池中育苗（FW: 9.38±0.23 g, DWG: 0.12±0.00 g/d, SGR: 3.27±0.03%/d） (p <；0.05)。网箱养殖的鱼苗相对条件因子（Kn: 1.50±0.01）显著高于池中养殖（Kn: 1.26±0.01,FCR: 1.32±0.02）和池中养殖（Kn: 1.15±0.01,FCR: 1.53±0.02），饵料系数（FCR: 1.24±0.06）显著低于网箱养殖(p <；0.05)。网箱和池塘培养系统支持鱼苗等长生长。不同培养系统的存活率无显著差异(p >；0.05)。池内hapas的浮游植物丰度（21.57 × 104细胞/mL）显著高于网箱（5.53 × 104细胞/mL）和水箱（2.76 × 104细胞/mL） (p <；0.05)。最后，在网箱中喂养尼罗罗非鱼苗可以提高生长和饲料效率，为增加种群数量以管理过度捕捞种群提供了一种有希望的策略。

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Nursing Nile tilapia (Oreochromis niloticus) fry in cages improves growth performance, feed efficiency, condition factor, and growth pattern for stock enhancement

The contribution of Nile tilapia (Oreochromis niloticus) to food security and livelihoods around Lake Victoria is diminishing due to recruitment overfishing. However, the application of stock enhancement as an alternative management approach for recruitment-overexploited stocks in developing countries is limited by scanty information, particularly regarding a suitable nursing system. This study determined growth performance, feed utilization, survival, condition factor, and growth pattern of Nile tilapia fry nursed in tanks, hapas-in-pond, and lake-based cages in Lake Victoria. Phytoplankton composition, abundance, and diversity were also assessed across the systems. Each system was stocked with 250 fry (mean weight: 0.63 ± 0.12 g) in triplicate and fed a commercial diet for 10 weeks. Results showed that the fry nursed in cages had significantly higher final weight (FW: 22.5 ± 0.86 g), daily weight gain (DWG: 0.33 ± 0.01 g/day), and specific growth rate (SGR: 4.47 ± 0.05%/day) compared to those in hapas-in-pond (FW: 16.4 ± 0.23 g, DWG: 0.22 ± 0.01 g/day, SGR: 4.04 ± 0.01%/day) and tanks (FW: 9.38 ± 0.23 g, DWG: 0.12 ± 0.00 g/day, SGR: 3.27 ± 0.03%/day) nursing systems (p < 0.05). Moreover, the fry reared in cages had significantly higher relative condition factor (K_n: 1.50 ± 0.01) and lower feed conversion ratio (FCR: 1.24 ± 0.06) than those reared in hapas-in-pond (K_n: 1.26 ± 0.01 and FCR: 1.32 ± 0.02) and tanks (K_n: 1.15 ± 0.01 and FCR: 1.53 ± 0.02) (p < 0.05). Cage- and pond-based culture systems supported isometric growth of fry. Percentage survival did not differ significantly among culture systems (p > 0.05). Hapas-in-pond had significantly higher phytoplankton abundance (21.57 × 10⁴ cells/mL) than cages (5.53 × 10⁴) and tanks (2.76 × 10⁴) (p < 0.05). Conclusively, nursing Nile tilapia fry in cages improves growth and feed efficiency, offering a promising strategy for stock enhancement to manage overfished populations.

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来源期刊

Journal of Great Lakes Research 生物-海洋与淡水生物学

CiteScore

5.10

自引率

13.60%

发文量

178

审稿时长

6 months

期刊介绍： Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.