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Feeding habits and growth characteristics of larval, juvenile, andyoung F1 of Epinephelus fuscoguttatus (♀) × E. lanceolatus (♂)
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1. Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture; Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China; 2. College of Fisheries and Life Science, Shanghai Ocean Univer

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S96

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    Abstract:

    Nutrition is an important factor that restricts the normal growth of fish fry. In the nutrition transitionperiod or feeding conversion process, it is crucial that the larval, juvenile, and young fish have access to adequatenutrition. Groupers are ferocious, carnivorous marine fish; if food supply is not sufficient, they feed on their ownlarvae and juveniles, and breeding efforts undergo substantial loss. In this research, we studied the feeding habitsand growth characteristics of larval, juvenile, and young fish of the FEpinephelus fuscoguttatusE. lanceolatus ) cross using artificial ecological methods. The larvae were fed when their mouths opened, andsamples selected from the breeding pool every afternoon after the larvae were fed. We sampled every day beforethe larvae were 10 days old; then, we sampled every 2 days. Each sample consisted of about 15 fish. All sampleswere used to test how much the fish ate. Other indexes were tested with other samples, the number of samplesranged from 10 to 100. After sampling, we observed morphological characteristics of the fish fry using a dissectingmicroscope, dissected the digestive tract under the dissecting microscope, and recorded amount of bait that hadbeen consumed. The results showed that: (1) the larval grouper started feeding 3 days after hatching when the watertemperature was approximately 29––s first bait wasthe ss type rotifer, followed by the L type rotifer, brine shrimp, and compound feed. The 3-day-old larvae werevery weak, with a feeding rate of 32% and repletion rate of 25%. The 5-day-old larvae were more dynamic thanthe 3-day-old larvae, with a feeding rate of 81.82% and repletion rate of 36.36%. The feeding rate was above 90%when the larvae were older than 7 days old, and the repletion rate was above 90% when the larvae were older than9 days old. (2) With growth and development of fish fry, the average feeding amount changed. The larvae required2 h 30 min to achieve satiation at 10 days old, and digestion took 1 h 45 min. The juveniles required 35 min toachieve satiation at 34 days old, and digestion took 3 h 20 min. Young fish required 30 min to achieve satiationand 10 h 25 min for digestion at 48 days old. (3) The correlations between net weight (. In this paper, feeding habits and growth characteristics were observed to provide a theoreticalbasis for large-scale breeding of FE. lanceolatus

    Reference
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于欢欢,李炎璐,陈超,孔祥迪,张廷廷,刘莉,徐万土,庞尊方,李文升. 棕点石斑鱼(♀)×鞍带石斑鱼(♂)杂交F1 仔、稚、幼鱼的摄食与生长特性分析[J]. Jounal of Fishery Sciences of China, 2015,[volume_no](5):968-977

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