摘要
为掌握南海柘林湾—南澳岛海洋牧场水域渔业资源本底情况,于2011年4月到2012年2月,使用Simrad EY60科学探鱼仪先后于不同月份对其进行了4次调查。调查显示2011年4月,21种评估鱼类总平均数量密度和平均资源量密度分别为2.68×104个/km2和0.73 t/km2;2011年8月,38种评估鱼类总平均资源数量密度和平均资源量密度分别为6.49×104个/km2和0.71 t/km2;2011年11月,33种评估鱼类总平均资源数量密度和平均资源量密度分别为4.14×104个/km2和0.93 t/km2;2012年2月,15种评估鱼类总平均资源数量密度和平均资源量密度分别为1.45×104个/km2和0.36 t/km2。结果表明,4个月资源量密度均不高;11月资源密度和资源量最高;2月资源密度和资源量最低,声学评估种类明显减少。4月积分值主要分布于4~8 m水层;8月积分值于4~14 m水层内分布比较均匀;11月积分值主要分布水层与4月相似,但10 m以深水体所占百分比高于4月;2月积分值主要分布于4~10 m水层,尤其是6~8 m水层。资源密度与水深之间无明显线性关系。各月份调查站点资源密度与SST无明显线性关系。各月份平均丰度密度与SST呈明显线性关系（R2=0.997 4）。各月份平均资源量密度与SST呈一定线性关系（R2=0.287 2）。研究证实声学方法在海洋牧场渔业资源评估过程中表现出良好的效果,推动了声学技术在海洋牧场渔业资源研究领域的发展,为今后我国深入开展海洋牧场渔业资源增殖效果评估研究提供了现实基础和科学依据。
In order to knowthe background information of fishery resources in Zhelin Bay-Nan＇ao Island marine ranching,four acoustic surveys were conducted with Simrad EK60 echosounder in different months from April 2011 to February 2012. The results showed that the average abundance density and biomass density of 21 species estimated were 2. 68 × 104 ind / km2 and 0. 73 t / km2 respectively in April 2011. The average abundance density and biomass density of 38 species estimated were 6. 49 × 104 ind / km2and0. 71 t / km2 respectively in August 2011. The average abundance density and biomass density of 33 species estimated were 4. 14 × 104 ind / km2 and 0. 93 t / km2 respectively in November 2011. The average abundance density and biomass density of 15 species estimated were 1. 45 × 104 ind / km2 and 0. 36 t / km2 respectively in February 2012. The fish density and biomass were the highest in November and the lowest in February. The nautical area scattering coefficient（ NASC） was distributed mainly in 4 ~ 8 m depth layer in April and evenly in 4- 14 m depth layer in August. In November the main depth layer was similar to that in April,but the percentage in the depth layer of higher than 10 m was higher than that in April. In February NASC was distributed mainly in 4- 10 m depth layer（ especially 6- 8 m）. No significant linear relationship was observed between fisheries resources density and water depth. Fisheries resources density did not showa significant linear relationship with sea surface temperature（ SST） of station monthly. There was significant linear relationship between monthly average abundance density and SST（ R2= 0. 997 4）. A linear relationship between monthly average biomass density and SST was found（ R2= 0. 287 2）. Our research confirmed that the acoustic method showed good effects in the process of marine ranching fishery resources assessment,promoting the development of acoustic technology in the research field of marine ranching and providing the realistic foundation and scientific basis for our country to further study the effect and assessment of marine ranching enhancement in the future.
出处
《水产学报》
CAS
CSCD
北大核心
2015年第8期1187-1198,共12页
Journal of Fisheries of China
基金
公益性行业(农业)科研专项(201003068)
国家科技支撑计划(2012BAD18B02)
国家财政专项“南海海洋捕捞信息动态采集网络”(2009-2015)
关键词
海洋牧场
渔业资源
声学评估
海表温度
柘林湾—南澳岛
marine ranching
fishery resources
acoustic estimation
sea surface temperature
Zhelin Bay-Nan＇ao Island
