福建农业学报2023，Vol.38Issue(10)：1195-1203,9.DOI:10.19303/j.issn.1008-0384.2023.10.008
新疆裸重唇鱼仔鱼饥饿试验及不可逆点的确定
Tolerance and PNR of Gymnodiptychus dybowskii Larvae under Artificial Starvations
摘要
Abstract
[Objective]Starvation tolerance of Gymnodiptychus dybowskii larvae was studied to determine the optimal time to start feeding larvae for the aquaculture.[Method]Morphological development,growth,and survival rate of regularly fed G.dybowskii larvae and those under artificially imposed starvation were observed in separate fish tanks with a controlled water temperature at 15.2-16.4℃.The point of no return(PNR)under starvation of the larvae was determined by the percentage of the stressed fish that took daily feed initially.[Result]The normal mixed nutrition for the larvae lasted 5-6 d.In general,on the 7th day after hatching the larvae started natural feeding,and their yolk sac disappeared in 12-13 d.Approximately 5%of the larvae began to feed at the time of feeding initiation stage.The percentage of larvae started feeding reached 100%on the 11th day but was 50%at PNR after 17 d when deprived of food.Normally,it lasted for 10 d for the larva beginning to take the initial morsel of food.There was no significant difference found in the total length of the larvae fed regularly and under the starvation treatment up until the age of 9 d(P＞0.05).However,at 12-day-old,the two groups of larvae began to significantly widen the differentiation in body length(P＜0.05),and the starved fish started to show negative growth with physiological atrophy.After PNR,body distortion and deformities appeared on the starved larvae with the mortality rate gradually rising to 100%25 d after hatching.[Conclusion]In a water of 15.2-16.4℃,G.dybowskii larvae displayed a tolerance to starvation with an apparent PNR.It showed that the optimal start time for feeding the larvae was 11 d after hatching.关键词
新疆裸重唇鱼/仔鱼/饥饿/不可逆点Key words
Gymnodiptychus dybowskii/larvae/starvation/point of no return分类
农业科技引用本文复制引用
张涛,牛建功,蔡林钢,曹文芝,沙文军,王小渝..新疆裸重唇鱼仔鱼饥饿试验及不可逆点的确定[J].福建农业学报,2023,38(10):1195-1203,9.基金项目
新疆重点研发任务专项(2022B02006) （2022B02006）
新疆自然科学基金项目(2023D01A114) （2023D01A114）
新疆"三农"骨干人才培养项目(2022SNGGCY0) （2022SNGGCY0）
