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Development of eggs and larvae of Stolephorus commersonnii and taxonomic key to fish eggs of the Clupeidae and Engraulidae off China

文献类型： 外文期刊

作者： Gao, Dongkui 1 ; Wan, Ruijing 2 ; Ma, Qian 2 ; Zhang, Xiumei 1 ; Bian, Xiaodong 2 ;

作者机构： 1.Ocean Univ China, Coll Fisheries, Qingdao 266003, Shandong, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Shandong, Peoples R China

关键词： Stolephorus commersonnii;molecular identification;development of eggs and larvae;taxonomic key;Clupeidae;Engraulidae

期刊名称：MARINE BIOLOGY RESEARCH （ 影响因子：1.298； 五年影响因子：1.499 ）

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收录情况： SCI

摘要： Fish eggs of successive stages of embryonic development, which were identified as belonging to specimens of Commerson's anchovy Stolephorus commersonnii through comparative molecular techniques, were collected from Leqing Bay, Zhejiang, China. Some eggs were reared artificially to obtain samples of successive developmental stages of larvae. The fertilized eggs of S. commersonnii are ellipsoidal and non-adhesive. The surface of the egg membrane is smooth and the perivitelline space is narrow. There is a single oil globule in the irregularly segmented yolk. Newly hatched larvae are transparent and devoid of pigments. Development of the larvae occurs in the following sequence: 8 h after hatching, the anus unfolds; 12 h after hatching, the pectoral fins emerge; 24 h after hatching, the liver and branchial arches emerge, and the alimentary canal differentiates into the oesophagus and intestinal canal; 30 h after hatching, the eyes become pigmented; 36 h after hatching, the upper and lower jaws become distinct; 42 h after hatching, the stellate melanophores emerge; 72 h after hatching, the postlarval developmental stage begins with the emergence of the dorsal fin. Based on the morphology of eggs and larvae of S. commersonnii, a taxonomic key to fish eggs of the Clupeidae and Engraulidae off China is established to provide an efficient and convenient way to identify the egg specimens. The fish eggs of the Clupeidae and Engraulidae off China could be identified to some extent by the buoyancy, shape and diameter of eggs, the number of layers in the egg membrane, the size of the perivitelline space, the number and diameters of oil globules, and the distribution of pigments. Meanwhile, their prelarvae could be identified by the number and diameters of oil globules, the distribution of pigments, the location of the anus and the number of myomeres.

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