叉尾鲇早期生活史研究

doi:10.16378/j.cnki.1003-1111.24175

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Abstract In order to investigate the embryonic and post-embryonic development of great white catfish Wallago attu, the domesticated wild great white catfish with body weight of more than 5 kg was firstly injected with luteinizing hormone-releasing hormone A₂ (LHRH-A₂) 3 g/kg and secondly injected with LHRH-A₂ 9 μg/kg + dioxone maleate (DOM) 6 mg/kg + human chorionic gonadotropin (HCG) 200 IU/kg. The fertilized eggs obtained by dry insemination were incubated in incubation box with small flowing water, and the development characteristics of embryos, larvae, and juvenile were observed, with the developmental timeline recorded. The results showed that great white catfish had spherical golden-yellow adhesive eggs. The mature eggs had diameter of (1.5±0.1) mm, and expanded to (1.7±0.1) mm upon water absorption. The entire embryonic development progresses were divided into nine stages, including fertilized egg stage, blastoderm disk stage, cleavage stage, blastula stage, gastrula stage, neurula stage, closure of blastopore stage, organogenesis stage, and hatching stage. The hatching thermal accumulation was found to be (651.51±15.00) ℃·h at water temperature from 26 to 28 ℃, with the tail being the first to break through the egg membrane. The newly hatched larvae had average total length of (4.4±0.5) mm, began “swimming” at 20 hours post-hatching, and initial feeding at 24 hours. Inadequate feeding often led to cannibalism, and the fish developed into the juvenile stage at 5 days post-hatching, and reached the young fish stage by 10 days, with total length of (52.0±4.3) mm, when the fin rays were fully developed, body coloration resembled that of adult fish, and the lateral bands were clearly visible. Great white catfish had good growth, with total length of (160.0±28.0) mm by day 30 post-hatching. The findings indicated that the mature artificial breeding technology led to great potential for aquaculture development.

Key words： Wallago attu embryonic development postembryonic development growth

Received: 14 October 2024

PACS:

Q959.4

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	Articles by authors
	YANG Yang
	ZHONG Tian
	DING Huiping
	PENG Li
	WANG Yuesong
	GAN Xing
	CHEN Rui
	SONG Rulin
	ZHANG Zhiming

Cite this article:

YANG Yang,ZHONG Tian,DING Huiping, et al. Observation of Embryonic and Postembryonic Development of Great White Catfish Wallago attu[J]. Fisheries Science, 2025, 44(6): 997-1005.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.24175 OR https://www.shchkx.com/EN/Y2025/V44/I6/997

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