摘要
细鳞鲑Brachymystax lenok成熟卵受精后20min,在26℃下处理20min,获三倍体细鳞鲑幼鱼。将二、三倍体细鳞鲑幼鱼饲养在210cm×50cm×45cm(水深60cm)的玻璃钢水槽内,每槽30尾,每种倍性鱼类设3个平行,水温8~10℃下常规养殖90d后,测定试验鱼体长、体质量和肥满度等生长指标。结果表明,三倍体细鳞鲑幼鱼的日增重、增重率和特定生长率显著高于二倍体幼鱼(P<0.05),但二、三倍体细鳞鲑幼鱼的肥满度、饲料系数和存活率等差异不显著(P>0.05)。二、三倍体细鳞鲑幼鱼的体长(L)与体质量(W)呈幂指数增长相关,均为异速生长。两者的特定生长率随体质量的变化趋势相同,均呈显著负相关。本研究结果表明:三倍体细鳞鲑幼鱼的生长特性优于二倍体,可示范养殖、推广。
The fertilized eggs of lenok Brachymystax lenok were treated at water temperature of 26 ℃for 20 min to obtain triploid juvenile lenok. The diploid and triploid lenok juveniles were routinely reared in a fiberglass reinforced plastic tank of 210 cm × 50 cm × 45 cm (water depth 60 cm) at stocking density of 30 fish in each tank with triplication at water temperature of 8 ~ 10℃ for 90 days. At the end of the feeding trial, the growth indices including body length, body weight and condition factor of the tested fish were measured. The results showed that there were significantly higher daily weight gain, weight gain rate and specific growth rate in the triploid lenok than those in diploid ones (P < 0.05), without significant differences in the condition factor, food conversion ratio and survival rate (P > 0.05). The body length (L) and body weight (W) of diploid and triploid lenok were exponentially increased, with allometric growth. The same increase trend of specific growth rates in body weight were observed in two groups, with significant negative correlation between them. The findings indicated that the triploid lenok had better growth than the diploid one did, thus the triploid lenok being used as an alternative species for aquaculture.
作者
魏凯
陈春山
郑伟
马龙
耿琰
WEI Kai;CHEN Chun-shan;ZHENG Wei;MA Long;GENG Yan(Beijing Aquatic Wildlife Rescue and Conservation Centre, Beijing 102100, China;Fisheries Technology Extension Station of Yanbian Autonomous Prefecture of Jilin Province, Yanji 133001, China)
出处
《水产学杂志》
CAS
北大核心
2019年第3期1-4,共4页
Chinese Journal of Fisheries
基金
北京市鲟鱼鲑鳟鱼创新团队项目(BAIC08-2018)
北京市农业局科技新星项目(PXM2018-036332-000002)
关键词
细鳞鲑
二倍体
三倍体
生长特性
Brachymystax lenok
diploid
triploid
growth characteristics
