采用BioSonicsDT-X超声波回声仪评估青海湖裸鲤资源量及其空间分布

摘要

A BioSonics DT-X digital scientific echosounder with 210 kHz split beam transducer was used to survey the Gymnocypris przwalskii abundance and spatial distribution in Qinghai Lake on August 10-13, 2010. The results indicated that the average fish density was 1. 83 ind. /1000 m3, with the amounts were 1.42 x 108 ind. , and the catchable abundance was about 17771. 23 t, at 16990. 84 t ~ 18551. 62 t, with 95% confidence inteval. The horizontal distribution of G. Przewalskii was inconsistently, and the results indicated that the maximum fish density located at the Buha estuary and Quanji estuary, and the average fish density were 6.04 ind. /1000 m3 and 6. 35 ind. /1000 m3. The minimum fish density located at the area of 151 Base and fishing ground wharf, and the average fish density was 0.26 ind. /1000 m3. For thevertical didtribution of G. Przewalskii were also inconsistently at the same time. The results indicated that the G. Przewalskii mainly distributed at 1 -6 to water depth. The maximum fish density was 28. 22 ind. /1000 m3 located at the 1~6 mwater depth of Buha estuary, and the minimum was 0. 02 ind./l000m3 located at the 21 -26 m water depth of Sankuaishi area.%2010年8月10日至8月13日,采用美国BioSonics DT-X(210 kHz)鱼探仪对青海湖中青海湖裸鲤(Gymnocypris przwalskii)资源量及空间分布特征进行了为期4d的水声学调查.分析结果显示:2010年8月青海湖裸鲤在全湖区的平均密度为(1.83±0.36)ind./1000m3,总尾数约为1.42×108 ind.,可捕资源量约为17771.23 t,95%置信区间为16990.84～18551.62t.青海湖裸鲤水平密度分布呈现不均匀性,最大密度值出现在布哈河河口(6.04 ind./1000 m3)和泉吉河河口水域(6.35 ind./1000m3)；最低密度值位于151基地至原渔场码头湖区(0.26 ind./1000 m3).青海湖裸鲤的水深分布也呈现不均匀性,主要分布于表层(1～6 m),其中最大平均密度(28.22 ind./1000m3)出现于布哈河口湖区表层(1～6 m),最小密度(0.02ind./1000m3)出现于三块石湖区底部水层(16～21 m).