金沙江中游圆口铜鱼早期资源现状

Status of Fish Resources of Early Life History Stages of Coreius guichenoti in the Middle Reaches of the Jinsha River

2010年6月至7月在金沙江中游攀枝花格里坪金沙滩(26°35°28.96″N,101°31°52.01″E)设置固定采样断面,开展了金沙江中游圆口铜鱼早期资源现状的调查。结果表明,金沙江中游有金安桥、朵美、皮拉海、灰拉古、观音岩5个圆口铜鱼产卵场,产卵总量为3078.2万粒。圆口铜鱼的产卵行为和产卵量受江水的温度、流量、涨落水持续时间等多个因素的影响。调查期间圆口铜鱼的产卵初始时间为6月7日,盛期在6月下旬至7月上旬。近几年来,圆口铜鱼的产卵规模呈现出逐年下降的趋势,产卵场的位置也有所改变。通过了解金沙江中游江段圆口铜鱼早期资源分布状况,为金沙江中游圆口铜鱼资源保护提供了基础资料。

According to the fixed sampling section in the golden sandy beach of Geliping town （Panzhihua city） sited in the middle reaches of the Jinsha River, the status of fish resources of early life history stages of the large mouth gudgeon （Coreius guichenoti） in the middle reaches of Jinsha River were investigated during June to July in 2010. The results indicated that there were five spawning sites located in the middle reaches of Jinsha River, including Jinan bridge, Duomei and Pilahai, Huilagu, Guanyinyan. The total number of eggs of C. guichenoti was 30 782 thousands individuals during the sampling period, but no larvae was obtained. The spawning behaviors and the total spawning number of C. guichenoti were influenced by water temperature, water flux, and duration time of rise and fall of the flood. The large mouth gudgeon initiated spawning on June 7th, and spawning zenith from the last ten days in June to early ten days in July. The total spawning scales were observed significantly declined in the recent years and spawning sites also relocated to some extent. Based on the study to the fish resource of early history stages of C. guichenoti, it could provide the basic data for the resource protection of C. guichenoti.