Tolerance of juvenile lumpfish (Cyclopterus Lumpus) to high rearing densities

IF 2.3 3区 农林科学 Q2 FISHERIES Journal of The World Aquaculture Society Pub Date : 2024-07-30 DOI:10.1111/jwas.13089
Nathaniel N. Spada, Elizabeth A. Fairchild, Jesse T. Trushenski
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Abstract

Lumpfish (Cyclopterus lumpus) are raised as cleaner fish for controlling sea lice. Intensive rearing is complicated by fin nipping that occurs between juvenile conspecifics. Lumpfish density‐dependent interactions are not well understood; therefore, the effects of rearing density for different fish size classes warranted evaluation. Two size classes (2‐ and 13‐g) of juvenile lumpfish were stocked at four different rearing densities (40, 60, 70, and 90 g/L) with growth, survival, and fish aggression assessed over 8 weeks. Mean weight gain and specific growth rates ranged from 170% to 307% and 1.77% to 2.50%, respectively, depending on density treatments, for the 2‐g fish, and from 286% to 471% and 2.42% to 3.10% for the 13‐g fish. Growth was negatively correlated with density, with faster growth linked to lower densities. No mortality occurred in any treatment and significant fish aggression only occurred among the larger lumpfish in the higher rearing densities. Based on these findings, growth of 2‐g lumpfish can be increased if reared at 40 g/L or slowed at 70 g/L without impacting aggression. For grow out of 13‐g fish to ~70 g with minimal aggression, a 40 g/L rearing density is recommended for faster growth and 60 g/L for slower growth.
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鳞鲈幼鱼对高密度饲养的耐受性
鳞鱼(Cyclopterus lumpus)是作为控制海虱的清洁鱼而饲养的。幼鱼之间的咬鳍会使密集饲养变得复杂。目前还不太清楚鳞鱼与密度之间的相互作用;因此,有必要评估饲养密度对不同大小鱼类的影响。以四种不同的饲养密度(40、60、70 和 90 克/升)投放两种规格等级(2 克和 13 克)的鳞鱼幼鱼,并在 8 周内评估其生长、存活率和鱼类攻击性。根据不同的密度处理,2 克鱼的平均增重率和特定生长率分别为 170% 至 307% 和 1.77% 至 2.50%,13 克鱼的平均增重率和特定生长率分别为 286% 至 471% 和 2.42% 至 3.10%。生长与密度呈负相关,密度越低,生长越快。在任何处理中都没有出现死亡现象,只有在饲养密度较高的情况下,较大的块鱼才会出现明显的攻击行为。根据这些发现,如果以 40 克/升的饲养密度饲养 2 克的块鱼,其生长速度可以加快;如果以 70 克/升的饲养密度饲养,其生长速度可以减慢,但不会影响鱼的攻击性。要让 13 克的鱼长到 70 克左右,同时将攻击性降到最低,建议采用 40 克/升的饲养密度,以加快生长速度;采用 60 克/升的饲养密度,以减缓生长速度。
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来源期刊
CiteScore
5.90
自引率
7.10%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of the World Aquaculture Society is an international scientific journal publishing original research on the culture of aquatic plants and animals including: Nutrition; Disease; Genetics and breeding; Physiology; Environmental quality; Culture systems engineering; Husbandry practices; Economics and marketing.
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