黄鹂无齿鲹(Gnathanodon speciosus)胚胎发育及胚后发育
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1.仲恺农业工程学院动物科技学院;2.广东省农业技术推广中心;3.华南农业大学海洋学院

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广东省重点领域研发计划项目 (2021B0202030001);2023年广东省乡村振兴战略专项省级项目-海水鱼类工厂化循环水育苗技术研究;2024年中央财政支持地方高校改革发展专项资金项目“智能海洋牧场与装备重点实验室”


Characteristics of the Embryonic and Post-embryonic Development of Golden Trevally(Gnathannodon speciosus)
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1.College of Animal Science and Technology,Zhongkai University of Agriculture and Engineering,Guangzhou;2.Guangdong Agricultural Technology Extension Center,Guangzhou;3.College of Marine Science,South China Agricultural University,Guangzhou

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This study was jointly supported by Fund for R & D Projects in Key Areas of Guangdong Province (2021B0202030001);2023 Special Fund for Rural Revitalization Strategy of Guangdong Province-Research on the Technology of Marine Fish Industrial Breeding in Circulating Water System;2024 Special Fund from Central Government for the Reform and Development of Local Universities -Key Laboratory for the Intelligent Marine Ranching and Equipment.

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    摘要:

    黄鹂无齿鲹(Gnathanodon speciosus)是一种兼具观赏与食用价值的名贵海水鱼类。本文报道了黄鹂无齿鲹的胚胎及胚后发育特征。受精卵孵化条件为:盐度(30.26±0.67)‰、 温度 (24.72 ± 0.32)°C 、 pH值(7.46±0.12)、溶解氧(5.13±0.33) mg/L、光照强度约3 000 LUX。结果显示黄鹂无齿鲹受精卵为透明浮性圆球形,平均卵径764.29 ± 14.74 μm;含单油球,油球平均直径166.32 ± 18.28 μm。胚胎发育历经受精卵期、胚盘期、卵裂期、囊胚期、原肠胚期、神经胚期、器官形成期与孵化出膜期8个阶段,再进一步细分成24个时期。受精后18 h 30 min孵化出膜,进入仔鱼阶段(含前仔鱼期和后仔鱼期)。前仔鱼期位于孵化后0-3天,卵黄囊没有完全吸收;后仔鱼期位于孵化后4-20天,卵黄囊完全吸收。初孵仔鱼全长1 520 ± 19 μm,出膜后第6天油球储备耗尽并形成鳔。孵化后第20天,鱼体后脊索完全弯曲,各鳍和消化系统发育完善,体表大量色素沉淀且具有独立生活的能力,仔鱼进入稚鱼阶段。本研究为黄鹂无齿鲹苗种培育提供了重要参考。

    Abstract:

    Golden trevally (Gnathanodon speciosus) is a marine fish with both ornamentation and edibility. In this paper, we described the characteristics of the embryonic and post-embryonic development of golden trevally. The hatchery conditions of the fertilized eggs were as follows : salinity (30.26±0.67)‰, temperature (24.72 ± 0.32)°C, pH value (7.46±0.12), dissolved oxygen (5.13±0.33) mg/l and light intensity (3000 LUX). The results showed that the zygotes were transparent floating spherical eggs with an average diameter of 764.29 ± 14.74 μm and a single oil bulb with an average diameter of 166.32 ± 18.28 μm. Embryonic development included 8 stages i.e. fertilized egg stage, blastodisc stage, cleavage stage, blastula stage, gastrula stage, neurula stage, organo-forming stage and hatching stage, subsequently subdivided into 24 stages. Eggs were hatched out at 18 h 30 min after fertilization followed by the larval stage. According to the absorption of yolk sac, larval stage was further divided into pre-larval stage (0-3 days, not complete absorption of yolk sac) and post-larval stage (4-20 days, complete absorption of yolk sac). The total length of the hatched-out larvae was 1520 ± 19 μm. The yolk sac has been completely absorbed at 3 day post of hatchery (DPH), and the oil globule was disappeared at 6 DPH with the appearance of swimming bladder. At 20 DPH, the posterior part of spinal column was curved which was the mark of juvenile stage , meanwhile the fins and the digestive system have been fully developed with a great amount of pigments deposited on the surface of the body, which were the symbols of it could live independently. The larval development belonged to an allometric model with faster speed at the early stage and slower speed at the late stage. This study will shed a new light on the breeding of golden trevally in the future.

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  • 收稿日期:2023-12-28
  • 最后修改日期:2024-02-06
  • 录用日期:2024-02-19
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