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Effects of stocking density on productive performance, economic profit and muscle chemical composition of pacu (Piaractus mesopotamicus H) cultured in floating cages
Aquaculture Research ( IF 2 ) Pub Date : 2022-03-29 , DOI: 10.1111/are.15845
Luciano F. Montenegro 1, 2, 3 , Sebastián Cunzolo 1, 2 , Cesar A. Preussler 4 , Herman H. Hennig 5 , Adriana M. Descalzo 1 , Carolina D. Pérez 1, 2
Affiliation  

The present 360-day study aimed to evaluate the productive performance, economic profit and meat quality of pacu cultured in floating cages at different stocking densities. A total of 2880 juvenile pacu, initial weight 50 ± 0.9 g, were reared in eight floating cages of 18.375 m3. Two stoking densities were used: high stocking density (HSD; 26 fish/m3) and low stocking density (LSD; 13 fish/m3). On days 0, 90, 180, 270 and 360, 100 fish per group were used to determine the growth performance, productive indices and total economic profit. The total economic profit was calculated by indices that include the fish price, feed conversion ratio and diet cost, among others. On day 360, the chemical composition and fatty acid profile of the muscle tissues were determined. The LSD group had higher final biomass and weight gain than the HSD group (p = 0.0001 and p < 0.0001 respectively), which was probably associated with the higher protein efficiency ratio obtained in the LSD group (p < 0.05). Additionally, the economic profit from LSD on day 360 was 1.2 times higher than that from HSD (p < 0.0001). More protein and lipid contents were obtained from LSD (p = 0.0035 and p < 0.0001 respectively) while more moisture was obtained from the HSD (p < 0.0001) group. In addition, more eicosapentaenoic (EPA) (p = 0.0013), docosapentaenoic (DPA) (p = 0.0001) and docosahexaenoic (DHA) (p = 0.0003) fatty acids were obtained from LSD. We concluded that when pacu are cultured in floating cages, 13 fish/m3 density produce fish with more weight and better muscle chemical composition, improving the economic profit and the nutritional quality.

中文翻译:

放养密度对漂浮网箱养殖白鲟(Piaractus mesopotamicus H)生产性能、经济效益和肌肉化学成分的影响

目前的 360 天研究旨在评估在不同放养密度的浮动网箱中养殖的 pacu 的生产性能、经济效益和肉质。8个18.375 m 3的浮笼共饲养2880只幼体pacu,初重50±0.9 g 。使用了两种加料密度:高放养密度(HSD;26 鱼/m 3)和低放养密度(LSD;13 鱼/m 3)。在第 0、90、180、270 和 360 天,每组 100 条鱼用于确定生长性能、生产指数和总经济利润。总经济利润由鱼价、饲料转化率和饲料成本等指标计算得出。在第 360 天,测定了肌肉组织的化学成分和脂肪酸谱。LSD 组的最终生物量和增重高于 HSD 组(分别为p = 0.0001 和p < 0.0001),这可能与 LSD 组获得的更高蛋白质效率比有关(p < 0.05)。此外,LSD 在第 360 天的经济利润是 HSD 的 1.2 倍(p< 0.0001)。LSD 组获得了更多的蛋白质和脂质含量(分别为p = 0.0035 和p < 0.0001),而 HSD 组获得了更多的水分(p < 0.0001)。此外,从 LSD 中获得了更多的二十碳五烯酸 (EPA) ( p = 0.0013)、二十二碳五烯酸 (DPA) ( p = 0.0001) 和二十二碳六烯酸 (DHA) ( p = 0.0003) 脂肪酸。我们得出结论,当pacu在浮动网箱中养殖时,13条鱼/m 3密度的鱼体重量更大,肌肉化学成分更好,提高了经济效益和营养质量。
更新日期:2022-03-29
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