Estimation of the Pacific Hake (Merluccius productus) Population in Port Susan, Washington, Using an Echo Integrator
Estimation of the Pacific Hake (Merluccius productus) Population in Port Susan, Washington, Using an Echo Integrator
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使用回波积分器估算华盛顿州苏珊港的太平洋鳕鱼 (Merluccius Productus) 数量
DOI：
10.1139/f71-194
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发表时间：
1971
期刊：
影响因子：
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通讯作者：
Alan E. Millikan
中科院分区：
文献类型：
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作者：
R. E. Thorne;J. E. Reeves;Alan E. Millikan
回声积分器开发的华盛顿大学被用来估计的规模的商业开发产卵的太平洋无须鳕（Merluccius productus）在苏珊港，华盛顿，在1969年和1970年。1969年使用了简单的电压积分器，1970年使用了电压平方积分器。这一变化增加了技术的客观性，并使置信区间的估计。这两个人口估计数的基础上的回声集成的结果分布在调查区的一些横断面。在100%净效率的假设下，针对净运输量校准积分器。声学普查表明，1969年至1970年期间产卵群规模明显减少，并得到商业捕捞率逐年下降的支持。年度渔获量和年龄数据表明，这种差异显然不是过度捕捞造成的。这一差异可能是由于总硫含量比例的不同所致。
Echo integrators developed at the University of Washington were utilized for estimation of the size of a commercially exploited spawning stock of Pacific hake (Merluccius productus) in Port Susan, Washington, in 1969 and 1970. A simple voltage integrator was used in 1969, and a voltage-squared integrator was used in 1970. This change increased the objectivity of the technique, and enabled estimation of confidence intervals. Both population estimates were based on the results of echo integration over a number of transects distributed over the survey area. The integrators were calibrated against net hauls on the assumption of 100% net efficiency. An apparent decrease in the spawning stock size between 1969 and 1970 was indicated by the acoustical census and was supported by a decline in the commercial fishing catch rates between years. Annual catch and age data indicate that this difference apparently is not due to overfishing. The difference probably resulted from variation in the proportion of the total s...