大泷六线鱼仔鱼饥饿试验及不可逆点的研究

摘要

In order to determine the definition of the point of no return(PNR) of the larvae of Hexagrammos otakii Jordan et Starks, we studied the effect of starvation on growth of the larvae of Hexagrammos otakii Jordan et Starks under the condi-tion with water temperature of 16℃±0.5℃ and salinity of 31‰, and the definition of the PNRwas determined. Larvae opened mouth at 3 day after hatching(DAH);Yolk and oil globules were completely absorbed at 7 DAH and 8 DAH, re-spectively. The mixing diet period was about 5-6 days. The influence of starvation on the absorption rate of yolk was sig-nificant (P<0.05). The influence of starvation on the absorption rate of oil globules was not significant (P>0.05) before larvae opened mouth, but significant (P<0.05) after larvae opened mouth. The total length of fed larvae increased continu-ously, while the starving larvae decreased in total length after 8 DAH. The PNR was between 8 DAH and 9 DAH.%为了确定大泷六线鱼(Hexagrammos otakii)仔鱼的初次摄食饥饿不可逆点(PNR),作者利用人工孵化得到的大泷六线鱼初孵仔鱼,在水温(16±0.5)℃、盐度31条件下,研究了饥饿对大泷六线鱼前期仔鱼生长的影响,并确定了仔鱼的初次摄食饥饿不可逆点。结果表明,仔鱼3日龄开口摄食,卵黄于7日龄消耗完毕,油球于8日龄消耗完毕,混合营养期为5~6 d,饥饿对仔鱼卵黄吸收速度影响显著(P＜0.05),对油球的吸收在仔鱼开口前影响不显著(P＞0.05),仔鱼开口后影响显著(P＜0.05)。摄食仔鱼生长呈线性增加,饥饿仔鱼生长呈现先升高后降低的趋势。仔鱼饥饿不可逆点出现在8日龄和9日龄之间。