| p>李瑜琬,梁浩辉,鲁慧杰,等.大口黑鲈仔稚鱼早期发育及对不同饲料原料的选择性试验[J].广东农业科学,2025,(3-4):- |
| Early Development of Larvae and Juvenile of largemouth bass（Micropterus salmoides) and Selective Experiment on Different Feedstuff |
| 投稿时间：2024-12-22 修订日期：2025-03-07 |
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| Abstract: |
| 【Objective】The aim is to gain a more comprehensive understanding of the early development and initial feeding behavior of largemouth bass larvae, providing scientific basis for their large-scale breeding and the development of open feed.【Method】Using microscopic observation, biological measurement, and tissue sectioning methods, the morphological characteristics of the developmental stages of juvenile largemouth bass were studied, and the changes in digestion, immunity, and antioxidant enzyme activity of juvenile largemouth bass were analyzed. At the same time, biological measurement methods were used to measure the body length and weight of largemouth bass fed with different feed materials for 12 dah, and their survival rates were recorded.【Result】The results showed that according to the disappearance of yolk sac, appearance of anus, fins and black spots during embryonic development of largemouth bass, it can be divided into the newly hatched larvae stage, larvae stage and juvenile stage. Among them, the larvae stage period can be divided into the early and late stages of fry based on the absorption of yolk sac. As the age of juvenile largemouth bass increases, its total body mass and total length gradually increases. Upper jaw length, total length and body mass all exhibit allometric growth. Trypsin, lipase, and amylase were detected at the beginning, but gastric protease was not detected at 0~15 dah. The activity of pancreatic protease showed an upward trend, with lipase decreasing first and then increasing, and α-Amylase shows a gradual upward trend, lipase first decreases and then increases.The liver and intestines of the newly hatched largemouth bass larvae were observed, with a embryonic stomach at 7 dah and a diffuse pancreas at 4 dah. Subsequently, the digestive system of juvenile fish undergoes structural and functional improvements as it grows. The activities of alkaline phosphatase and lysozyme in largemouth bass showed an initial increase followed by a decrease and then an increase again; The total superoxide dismutase, catalase, and glutathione antioxidant enzymes showed an initial increase followed by a decrease, while propylene glycol showed an initial increase followed by a decrease followed by an increase (P<0.05). The final body length and survival rate of the Fairy shrimp group were significantly better than those of the earthworm fermented insect paste group, soycomil group, and Spirulina powder group (P<0.05). There were no significant differences in final body mass, specific growth rate, and fertilizer coverage among the groups (P>0.05). 【Conclusion】The juvenile stage of largemouth bass can be divided into three stages: the newly hatched larvae stage,larvae stage and juvenile stage, with a feeding time of 5 days. With the increase of age, the regular changes in the external morphology of juvenile fish promote the development of their internal digestive and immune systems, which can quickly improve their hunting, swimming, and immune abilities and adapt to early living environments. Among the three types of feedstuffs, earthworm fermented insect paste has a better feeding effect and has a growth promoting effect similar to that of the fairy shrimp. It can be used as a candidate feed material for feeding larvae largemouth bass for further development and utilization. |
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