Fisheries Science ( IF 1.4 ) Pub Date : 2023-09-26 , DOI: 10.1007/s12562-023-01722-5
Kyohei Kakuta , Ippei Narita , Daisuke Ishizaki , Yoshiaki Kai , Takeshi Kikko
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For stock enhancement of the pond smelt Hypomesus nipponensis in Japan, eyed eggs have been transplanted into numerous lakes, ponds, and reservoirs throughout the country from a number of major lake populations. For consistent effective stock enhancement, propagation skills in the recipient lakes, including conservation of spawning habitats and construction of artificial spawning sites, are necessary, independent of eyed-egg transplantation from other lakes. The physical characteristics of the spawning habitats selected by pond smelt in 6 rivers feeding Lake Yogo were surveyed, focusing on water velocity, depth, and substrate. The analysis using Jacobs’ selective index shows that pond smelt selectively spawn at sites in shallow depth (5–30 cm), with moderate water velocity (10–50 cm/s), utilizing gravel, pebbles, and sand in riffles, as opposed to mud and silt near the river mouths. The biological information gained in this study is useful background for the conservation of spawning habitats and construction of artificial spawning sites in other regions of Japan.
中文翻译:
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日本中部约戈湖小入口河流中胡瓜鱼产卵生境特征
用于池塘胡瓜鱼的种群增殖在日本,来自多个主要湖泊种群的有眼卵被移植到全国各地的众多湖泊、池塘和水库中。为了持续有效地增加种群数量,受纳湖泊的繁殖技能,包括保护产卵栖息地和建设人工产卵场,是必要的,独立于其他湖泊的有眼卵移植。对约戈湖的 6 条河流中胡公鱼所选择的产卵栖息地的物理特征进行了调查,重点是水速、深度和底质。使用雅各布斯选择指数的分析表明,池塘公鱼选择性地在浅水(5-30 厘米)、中等水速(10-50 厘米/秒)的地点产卵,利用浅滩中的砾石、卵石和沙子,而相反河口附近的泥土和淤泥。