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首页> 外文期刊>African Journal of Biotechnology >Effect of stocking density on growth, maturity, fecundity, reproductive behaviour and fry production in the mouth brooding cichlid Oreochromis mossambicus (Peters)
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Effect of stocking density on growth, maturity, fecundity, reproductive behaviour and fry production in the mouth brooding cichlid Oreochromis mossambicus (Peters)

机译：种群密度对口育丽鱼科莫桑比克拟南芥（Oreochromis mossambicus）（Peters）的生长，成熟度，繁殖力，生殖行为和鱼苗生产的影响

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摘要

Growth and reproductive performance of?Oreochromis mossambicus?(Peters) in relation to stocking density was evaluated in indoor aquaria. Juveniles weighing 978 ± 370 mg were held in densities of 10, 20, 30 and 40 aquarium-1?(429, 858, 1287 and 1716 juveniles/m3) in aquaria (size: 46 × 23 × 23 cm) each containing 12 L freshwater. They reared on dry?Tubifex tubifex?worms and dry fish pellets for over 25 weeks. Growth and specific growth rates were inversely proportional to stocking density (P=0.0555, r=0.944; P=0.0395, r=0.960 respectively). At the highest stocking density (40 juveniles aquarium-1), magnitude of decrease in daily growth was 51.21%. Increase in stocking density resulted in reduction in size at maturity in both the sexes (male: 2 to 7.5%; female: 1.37 to 5.57%), reduction in fecundity (25 to 31%), fry production (18.58 to 28.58%) and inter-spawning interval (25 to 40%). At a living space of 597 cm3/fish (40 fish aquarium-1), though males constructed the nest, females failed to spawn as post vitellogenic oocytes had become atretic and/or resorbed.
机译：在室内水族箱中评价了莫桑比克罗非鱼的生长和繁殖性能与放养密度的关系。将重量为978±370毫克的幼鱼放在密度为10、20、30和40的水族箱1？（429、858、1287和1716个幼鱼/立方米）中，每个水族箱中容纳12升（46×23×23厘米）淡水。他们用干燥的“ Tubifextubifex”蠕虫和干燥的鱼丸饲养了超过25周。生长和特定生长率与放养密度成反比（分别为P = 0.0555，r = 0.944; P = 0.0395，r = 0.960）。在最高的种群密度（40个青少年水族箱-1）下，日生长量下降的幅度为51.21％。放养密度的增加导致两性成熟时的体型减小（男性：2％至7.5％;女性：1.37％至5.57％），繁殖力降低（25％至31％），鱼苗产量（18.58％至28.58％）和产卵间隔（25％到40％）。在每只鱼597立方厘米（40个鱼缸-1）的生活空间中，尽管雄性筑巢，雌性却未能产卵，因为卵黄体形成后的卵母细胞已经闭锁和/或被吸收了。

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