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首页> 外文期刊>Limnology >Potential importance of lagoons as breeding grounds for bluegill Lepomis macrochirus in Lake Biwa, Japan
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Potential importance of lagoons as breeding grounds for bluegill Lepomis macrochirus in Lake Biwa, Japan

机译：咸水湖作为日本琵琶湖大g Lepomis macrochirus繁殖地的潜在重要性

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摘要

Exotic bluegill Lepomis macrochirus have been propagating in the littoral region of Lake Biwa and its tributary lagoons. To investigate the reproductive activity of bluegill in the prespawning season, fish samples were collected from three sites at the littoral region of the lake and their nearby lagoons. The number of females relative to the total number of specimens tended to be higher in lagoons than in the adjacent littoral sites in the lake. The females collected from lagoons had significantly larger ovaries than those from the lake. The means of gonadal somatic index of females in the lake ranged from 1.77 to 3.44, whereas those in lagoons ranged from 4.35 to 12.2. The higher temperature conditions of lagoons appeared to be responsible for the higher maturation of ovaries of the fish in lagoons. The environmental condition of lagoons is potentially suitable for the active growth of larvae, subsequently increasing their overwintering success. Therefore, earlier spawning of bluegill in lagoons might have contributed to the propagation of bluegill in Lake Biwa to some extent.
机译：外来蓝blue Lepomis macrochirus在琵琶湖及其支流泻湖的沿海地区繁殖。为了调查蓝ill在产卵前的繁殖活动，从湖的沿岸地区及其附近的泻湖的三个地点采集了鱼样本。泻湖中相对于标本总数的雌性数量往往比湖中相邻的沿海地点高。从泻湖收集的雌性卵巢比从湖中收集的雌性卵巢大得多。湖泊中雌性的性腺体细胞指数平均值在1.77至3.44之间，而泻湖中的雌性体质指数在4.35至12.2之间。泻湖的较高温度条件似乎是泻湖中鱼卵巢的较高成熟度的原因。泻湖的环境条件可能适合幼虫的活跃生长，从而增加其越冬的成功率。因此，蓝g在泻湖中的较早产卵可能在一定程度上促进了wa在琵琶湖中的繁殖。

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