淡水石首鱼人工催产与胚胎发育观察
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张亮(1993–),男,硕士研究生,研究方向为淡水名特优鱼类繁育.E-mail:181308459@qq.com

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S917

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江苏省农业科技自主创新项目[CX(20)2025]; 中国水产科学研究院长江特色水生动物繁养创新团队项目; 无锡市科技发展资金项目(N20203008); 中国水产科学研究院淡水渔业研究中心中央基本业务费项目(2020JBFR02, 2020JBFR03)


Artificial spawning and embryonic development of freshwater drum, Aplodinotus grunniens
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    摘要:

    以人工培育的淡水石首鱼(Aplodinotus grunniens)亲本为基础, 首次通过人工催产突破了人工繁育关键技术, 并系统观察了其胚胎发育时序和特征。研究结果表明, 引进的淡水石首鱼野生苗种经过 3 年的人工培育, 雌、雄亲鱼达到性成熟; 结合产前加温与营养强化培育, 采用 LHRH-A2 一次人工催产和干法授精获得一批受精卵。在水温 23~24 ℃条件下, 淡水石首鱼的催产效应时间为 25~27 h。其成熟卵为淡黄色, 卵径为(1.07±0.04) mm; 卵受精的同时吸水膨胀呈圆球形, 浮性, 半透明, 无黏性, 有 1 个同心油球, 少数受精卵油球有 2~3 个, 大小不一, 膨胀后的卵径为(1.41±0.03) mm, 油球径为(0.66±0.02) mm。淡水石首鱼胚胎发育过程可划分为胚盘形成、卵裂、囊胚、原肠胚、神经胚、器官形成及孵化 7 个阶段 29 个时期; 受精卵经 25 h 30 min 孵化出膜, 初孵仔鱼平均全长(2.88±0.10) mm。 本研究首次报道了淡水石首鱼在人工养殖和催产条件下的胚胎发育特征, 将为进一步实现苗种规模化繁育提供基础资料和重要参考。

    Abstract:

    Sciaenidae species have been an important focus of global marine fisheries and mariculture for a long time owing to its delicate meat, delicious taste, and high corresponding economic value. At present, several species of the family have been successfully cultivated in China, such as Pseudosciaena polyactis, Megalonibea fusca, Nibea diacanthus, Collichthys lucidus, and Sciaenops ocellatus, but none are suitable for freshwater aquaculture in China. Among the 70 genera with 270 existing species of Sciaenidae, only a few are freshwater species, including Boesemania microlepis from Southeast Asia and Aplodinotus grunniens from the Americas. A. grunniens is commonly known as the freshwater drum, topuche, or sheepshead. Freshwater drum have several advantages such as fast growth, good meat quality, no intermuscular spines, and strong adaptability. It is suitable for freshwater and brackish aquaculture in most parts of China and has a broad market prospect. In terms of reproduction biology, embryonic and larval development is one of the key research agendas. Understanding the development characteristics and timings of fish embryos is helpful for improving hatching and survival rates of larvae. At present, there are no data available on embryonic and larval development of freshwater drum for domestic cultivation, and foreign research has not been systematic owing to limitations in artificial breeding technology. This study on artificially reared freshwater drum specimens is the first to obtain fertilized eggs by manual stimulation with oxytocin. Subsequently, the sequence and morphological characteristics of developing embryos of freshwater drum were recorded and described in detail. We believe that our results will enrich the biological data on early development and provide theoretical guidance for the artificial breeding of freshwater drum. The results showed that all studied males of the species were sexually mature, while most females were sexually mature after 3 years of artificial cultivation and can spawn more than once during a spawning season. Artificial reproduction could be realized by means of enhanced cultivation and manual oxytocin stimulation. The spawning duration of freshwater drum was approximately 27 h (23–24 ℃). Mature eggs were slightly yellow with an average diameter of 1.07 mm (SD= 0.04). Newly fertilized eggs of freshwater drum were spherical, pelagic, translucent, and non-adhesive with only one concentric drop of oil of 0.66 mm (SD = 0.02). There were 2–3 drops of oil of different sizes among fertilized eggs. The diameter of fertilized egg expanded to 1.41 mm (± 0.03). The embryonic development of freshwater drum can be divided into 7 phases and 29 periods, including: disk formation, cleavage, blastocyst, gastrula, neurula, organ formation, and incubation. Eclosion started at 25.5 h post-fertilization when larvae had attained a length of 2.88 mm (SD = 0.10). The morphologic characters recorded in the study were similar to those of Sciaenidae species in general. The diameter of the eggs and the length of the larvae for freshwater drum were larger than those of other Sciaenidae species such as Miichthys miiuy, Nibea albiflora, N. diacanthus, C. lucidus, and S. ocellatus and the same as those of P. polyactis. The diameter of the drop of oil was obviously larger than that of the other Sciaenidae species mentioned above. This study is the first to report the embryonic development characteristics of freshwater drum under artificial culture and manual oxytocin stimulation and will provide basic data and important references for future implementation of large-scale breeding of the species.

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张亮,闻海波,郑冰清,李红霞,宋长友,金武,马学艳,徐跑,华丹,顾若波.淡水石首鱼人工催产与胚胎发育观察[J].中国水产科学,2021,28(5):569-578
Zhang Liang, Wen Haibo, Zheng Bingqing, Li Hongxia, Song Changyou, Jin Wu, Ma Xueyan, Xu Pao, Hua Dan, Gu Ruobo. Artificial spawning and embryonic development of freshwater drum, Aplodinotus grunniens[J]. Journal of Fishery Sciences of China,2021,28(5):569-578

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  • 在线发布日期: 2021-05-20
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