三峡水库香溪河库湾基于初级生产力的渔产潜力估算

于20132014 年在三峡水库香溪河库湾开展了浮游植物初级生产力的调查, 并分别采用营养动态模型、Cushing 模型、Tait 模型和Downing 模型计算了该库湾滤食性鱼类的渔产潜力, 以此来评估其水体承载量。结果表明, 香溪河库湾初级生产力具有显著的时空异质性;据此计算的渔产潜力显示了空间差异和季节动态;高岚河水域的渔产潜力较其他水域要大;夏季渔产潜力最大, 从大到小依次为春季、秋季、冬季。上述方法计算的滤食性鱼类渔产潜力分别为7.3103、1.046104、1.256104 和2.064106 kg/y。除了Downing模型外, 其他方法的估算结果较接近渔业资源量的真实状况。以3 个模型计算的渔产潜力为核算依据, 确认该库湾滤食性鱼类的水体承载量约为104 kg, 最大持续捕捞量可达5103 kg/y。研究结果可为三峡水库支流库湾渔业资源的可持续利用提供必要的技术支撑。  

THE ASSESSMENT OF THE FISHERY POTENTIAL BASED ON THE PRIMARY PRODUCTIVITY IN THE XIANGXI BAY OF THE THREE GORGES RESERVOIR

We investigated the primary productivity in the Xiangxi Bay of Three Gorges Reservoir in order to evaluate the fishery potential from 2013 to 2014. Four equations were used to calculate the fishery potential based on the primary productivity. The results demonstrated a significant spatio-temporal heterogeneity in the primary productivity in the Xiangxi Bay. Consequently the fishery potential based on the primary productivity also showed significant spatial dynamics and seasonal variation. Spatially the highest fishery potential appeared in the Gaolan branch. Temporally the highest fishery potential appeared in summer, and the seasonal order was summer spring autumn winter. The annual fishery potential calculated with the four methods above were 7.30 t/y, 10.46 t/y, 12.56 t/y and 2064.03 t/y respectively. Except for the Downing model, all other three methods generated results close to the actual fishery resources. We concluded that the phytoplanktivorous fishery resources capacity in the Xiangxi Bay was about 10 t, and the maximum sustainable yields could be 5 t. Our study provided technical support for the sustainable utilization of fisheries resource in the tributaries of the Three Gorges Reservoir.