{"title":"埃塞俄比亚贝塞卡湖尼罗提鱼的生殖生物学","authors":"Lemma Abera Hirpo","doi":"10.5897/JCAB2013.0388","DOIUrl":null,"url":null,"abstract":"Reproductive biology of Oreochromis niloticus in Beseka was studied. Samples of O.niloticus were collected monthly during September 2010 to August 2011 using different centimeter mesh sizes of gillnets. The relationship between total length and total weight was curvilinear and sex ratio was different throughout the sampling periods. The 50% sexual maturity length (L50) was estimated at 14 cm TL for females and 17 cm TL for males. Estimated fecundity was linearly related with total length and total weight of the fish. Absolute fecundity was estimated in number and range from 125 to 251 with a mean of 161 ± 2.5. The frequency of ripe gonads suggested that O. niloticus in Lake Beseka breeds throughout the year and intensive breeding coincided with the rainy seasons. \n \n \n \n Key words: Breeding season, length-weight, Oreochromis niloticus, sex ratio, fecundity, Lake Beseka.","PeriodicalId":15216,"journal":{"name":"Journal of Cell and Animal Biology","volume":"49 1","pages":"116-120"},"PeriodicalIF":0.0000,"publicationDate":"2013-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"21","resultStr":"{\"title\":\"Reproductive biology of Oreochromis niloticus in Lake Beseka, Ethiopia\",\"authors\":\"Lemma Abera Hirpo\",\"doi\":\"10.5897/JCAB2013.0388\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Reproductive biology of Oreochromis niloticus in Beseka was studied. Samples of O.niloticus were collected monthly during September 2010 to August 2011 using different centimeter mesh sizes of gillnets. The relationship between total length and total weight was curvilinear and sex ratio was different throughout the sampling periods. The 50% sexual maturity length (L50) was estimated at 14 cm TL for females and 17 cm TL for males. Estimated fecundity was linearly related with total length and total weight of the fish. Absolute fecundity was estimated in number and range from 125 to 251 with a mean of 161 ± 2.5. The frequency of ripe gonads suggested that O. niloticus in Lake Beseka breeds throughout the year and intensive breeding coincided with the rainy seasons. \\n \\n \\n \\n Key words: Breeding season, length-weight, Oreochromis niloticus, sex ratio, fecundity, Lake Beseka.\",\"PeriodicalId\":15216,\"journal\":{\"name\":\"Journal of Cell and Animal Biology\",\"volume\":\"49 1\",\"pages\":\"116-120\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2013-09-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"21\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Cell and Animal Biology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.5897/JCAB2013.0388\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Cell and Animal Biology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5897/JCAB2013.0388","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 21
摘要
研究了尼罗河狭蝽(Oreochromis niloticus)的生殖生物学。2010年9月至2011年8月，采用不同厘米目数的刺网每月采集niloticus样本。总长度与总重量的关系呈曲线关系，性别比例在整个采样期内有所不同。50%性成熟长度(L50)雌性为14 cm TL，雄性为17 cm TL。估计的繁殖力与鱼的总长度和总重量呈线性相关。估计绝对繁殖力的数量和范围为125 ~ 251，平均值为161±2.5。成熟性腺的频率表明，塞贝加尔湖的niloticus全年都在繁殖，密集繁殖与雨季相吻合。关键词:繁殖季节，长重，尼罗褐条鱼，性比，繁殖力，贝塞卡湖
Reproductive biology of Oreochromis niloticus in Lake Beseka, Ethiopia
Reproductive biology of Oreochromis niloticus in Beseka was studied. Samples of O.niloticus were collected monthly during September 2010 to August 2011 using different centimeter mesh sizes of gillnets. The relationship between total length and total weight was curvilinear and sex ratio was different throughout the sampling periods. The 50% sexual maturity length (L50) was estimated at 14 cm TL for females and 17 cm TL for males. Estimated fecundity was linearly related with total length and total weight of the fish. Absolute fecundity was estimated in number and range from 125 to 251 with a mean of 161 ± 2.5. The frequency of ripe gonads suggested that O. niloticus in Lake Beseka breeds throughout the year and intensive breeding coincided with the rainy seasons.
Key words: Breeding season, length-weight, Oreochromis niloticus, sex ratio, fecundity, Lake Beseka.
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