Spawning season and nest guarding behavior of invasive smallmouth bass ( <i>Micropterus dolomieu</i> ) in a Japanese Lake
Spawning season and nest guarding behavior of invasive smallmouth bass ( <i>Micropterus dolomieu</i> ) in a Japanese Lake
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日本湖中入侵小口黑鲈 (<i>Micropterus dolomieu</i>) 的产卵季节和守巢行为
DOI：
10.1111/1440-1703.12316
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发表时间：
2022
影响因子：
2
通讯作者：
Kitano Satoshi
中科院分区：
文献类型：
--
作者：
Peterson Miles I.;Kitano Satoshi
在2020年和2021年，在日本长野野尻湖，研究了入侵的小口鲈鱼（Micropterus bassieu）的产卵。当水温达到14°C时，雄性小嘴鲈鱼开始筑巢，卵在大约2周内逐渐扩散。主要产卵季节在5月下旬至6月上旬，6月下旬至7月上旬有一个较小的第二次产卵高峰。巢主要是在码头覆盖下建造的，巢的大小和深度与雄性的体型大小呈正相关。在收到鸡蛋的巢中，几乎所有的进展都成功地进行了鱼苗扩散。雄性守卫行为的延时视频显示，随着巢穴的进展，雄性旋转较少，并悬挂在底部基板上。同样，通过实验性地移除守卫雄性来确定卵捕食者的存在。淡水虾虎鱼（Rhinogobius kurodai）是唯一的卵捕食者观察到，并在所有的巢在卵阶段到达。然而，只有少数的虾虎鱼访问每个巢，总的卵被捕食的数量是低的，并在进步阶段的鸡蛋或alevins很少被捕食。这些结果表明，在野尻湖，小嘴鲈鱼产卵是非常成功的，蛋捕食者似乎对鸡蛋的生存影响甚微。稳定的小嘴鲈鱼渔业没有放养在这个湖可能是这些有利的产卵条件的产物。缺乏本地的卵捕食者也可能是小嘴鲈鱼在日本持续传播的一个驱动因素。
Spawning of invasive smallmouth bass (Micropterus dolomieu) was studied in 2020 and 2021, in Lake Nojiri, Nagano, Japan. Male smallmouth bass began nest construction once water temperatures reached 14°C, and eggs progressed to fry dispersal in approximately 2 weeks. The main spawning season was in late May through early June, with a smaller second peak of nests in late June through early July. Nests were constructed primarily under dock cover, and nest size and depth were positively correlated with male body size. Of the nests that received eggs, nearly all progressed successfully to fry dispersal. Time lapse videos of male guarding behavior revealed that as nests progressed, males rotated less and were suspended off the bottom substrate. Similarly, the presence of egg predators was determined by experimental removal of guarding males. Freshwater gobies (Rhinogobius kurodai) were the only egg predators observed and arrived on all nests in the egg stage. However, only a handful of gobies visited each nest, the total number of eggs predated was low, and eggs or alevins in the progressed stage were rarely predated. These results indicate that in Lake Nojiri, smallmouth bass spawning is highly successful and egg predators appear to have minimal effect on egg survival. The stable smallmouth bass fishery without stocking at this lake is likely a product of these favorable spawning conditions. The lack of native egg predators may also be a driving factor in the continued spread of smallmouth bass throughout Japan.