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Quantitative estimation of the predation of marine ranched striped jack Pseudocaranx dentex by herons

机译：苍鹭对海洋带状斑纹假car齿的捕食性的定量估计

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摘要

The Goto station of the Japan Sea-Farming Association conducted marine ranching experiments with striped jack Pseudocaranx dentex from 1988 to 1999 in the Goto Islands, Nagasaki, Japan. Marine ranching is a stocking method where released fish are fed for some period after release in order to decrease initial mortality from starvation. Ranched fish were fed for 0, 90, and 15 days after stocking in 1997, 1998, and 1999, respectively. During the experiment, herons (grey heron Ardea cinerea, black-crowned night heron Nycticorax nycticorax, and great egret Egretta alba) were often observed preying on released fish in the ranching area. The present study estimated the number of fish preyed upon by herons during observation periods in 1997, 1998, and 1999 from the number of herons that flew into the ranching area and the predation rate on ranched fish by herons. The former was counted during sightings. The latter was estimated from the sighting observations and heron regurgitations. The number of herons that flew into the ranching area increased with the feeding period. The numbers of fish lost to predation by herons in 1997, 1998, and 1999 were estimated to be 0, 5,741, and 829, respectively.
机译：1988年至1999年，日本海上养殖协会五岛站在日本长崎的五岛群岛进行了带条纹千斤顶假牙齿的海洋放牧试验。海洋放养是一种放养方法，在放养后的一段时间内放养放养的鱼，以减少饥饿造成的初始死亡率。放养的鱼分别在1997年，1998年和1999年放养0天，90天和15天。在实验过程中，经常观察到苍鹭（灰鹭Ardea cinerea，黑冠夜鹭Nycticorax nycticorax和大白鹭Egretta alba）捕食放牧区的鱼类。本研究根据飞入牧场的苍鹭数量和苍鹭对牧场鱼的捕食率，估算了1997、1998和1999年观测期内鹭鹭捕食的鱼类数量。前者在目击中被计算在内。后者是根据目击观察和鹭鹭返流估计的。飞入牧场的苍鹭数量随着喂养时间的增加而增加。苍鹭在1997年，1998年和1999年因捕食而流失的鱼类数量分别估计为0、5,741和829。

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