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Cheng Changqi; Liu Jianhu; Yuan Xili (Fishery Department of Southwest Agricultural University, Chongqing 400716)  
The early life history of American paddlefish is divided into three stages: larva, juvenile and young. The larva stage lasts for 23~25 days from hatchery, during which time its body grows to about 57 mm and the kiss length accounts for approximately 30% of the total length. In the juvenile stage (67~73 days after hatchery) all the fins complete their development (D.37~44, A. 33~45, P. 21~26, V. 23~30 and C. 79~91) with a total length of 164 mm. It enters into the young stage 73 days after hatchery, during which time its body grows to 164.0 mm, the length of its kiss accounts for 30% of the total and the proportion of various parts of the body is simmilar to that of the adult paddlefish. In its early development the length of its kiss and head increases quite rapidly while its body height, eye diameter and tail height grow comparatively slowly.
【Fund】: 四川省科委九五攻关项目
【CateGory Index】: Q959.463
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