饥饿对大菱鲆(Scophthalmus maximus)雌核发育二倍体仔鱼前期生长的影响

Starvation is a major reason causing mortality during early feeding stage of fish larvae. We conducted an experiment to study how the larvae endure starvation via absorption, transition, and disappearance of inner nutrition materials, yolk, and oil globule. The diploidy gynogenesis of larvae are different from normal ones in insemination and germ plasm. We studied the effects of starvation on the growth and development of gynogenesis of turbot larvae by detecting the absorption of yolk and oil globule, the first feeding rate, the point of no return (PNR), and the growth and survival rate. During the experiment, the yolk and oil globules of starved gynogenetic larvae were completely disappeared on Day 6 and Day 7 after hatching, respectively. The highest feeding rate of starved larvae was about 85.3% occurred on Day 4, and PNR shown on Day 8. The development stopped and decreased on Day 6 onwards with syndromes of pectoral angle and body atrophy with color darkening. However, no distinct difference was found between starved gynogenetic larvae and the starved normal ones in absorption of yolk and oil globule, the first feeding rate, PNR, and the development length. Starvation did not affect the absorption of yolk and oil globule, which is the same as fed larvae. The consumption of yolk was centralized, while that of oil globule was uniform and mild. The starvation PNR arrived after inner source nutrition in larvae was used up. Feeding rate reached its peak during telophase of turbot larvae yolk absorption. These results are of significance for the study of larvae's energy metabolism and growth.t