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| Histological Observation of Ovarian Development of Apteronotid Eel Apteronotus albifrons |
| HA Chengxu1, YANG Cuihua1, WANG Wei1, WANG Yunzhong1, LIU Ping2 |
1. Qingdao Marine Science and Technology Museum,Qingdao 266003, China;
2. Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China |
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Abstract The mature ovary of apteronotid eel Apteronotus albifrons is saccate with an unusual cloacal orifice position located in the front of the body and behind the mandible. The histological research using conventional paraffin section method found that ovarian development of apteronotid eel was divided into six stages and oogenesis into five phases. The results showed that four-month old apteronotid eel had ovaries in stage Ⅱ,and oocytes in phase Ⅱ. Six-month old apteronotid eel had ovaries in stage Ⅲ where there were oocytes in phase Ⅱ and phase Ⅲ, the latter being the most prevalent. Ten-month old apteronotid eel had ovaries in stage Ⅳ where oocytes were in phase Ⅱ, phase Ⅲ and phase Ⅳ, reaching sexual maturity. Phase Ⅴ oocytes were dominant in ovaries of eleven-month old apteronotid eel in stage Ⅴ. Oocyte size distribution was bimodal for stage Ⅴ ovary. The oocytes were primarily ranged from 1.08—1.15 mm to 1.78—1.84 mm in diameter. In an ideal environment, the oocytes matured and were released in a short period of time after a batch of eggs were released. This is in accordance with the characteristics of batch spawners.
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Received: 09 December 2019
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