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首页> 外文期刊>Latin american journal of aquatic research >Evaluation of the entry of white shrimp postlarvae (Decapoda: Penaeidae) to a nursery area in the southern Gulf of Mexico
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Evaluation of the entry of white shrimp postlarvae (Decapoda: Penaeidae) to a nursery area in the southern Gulf of Mexico

机译：评估白色虾虾幼体（十足目：对虾科）进入墨西哥湾南部的苗圃地区

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摘要

The immigration of white shrimp Penaeus setiferus (Decapoda: Penaeidae) postlarvae (Pls) into the Terminos Lagoon was studied to determine the annual pattern of abundance and its relationship with temperature, salinity, tidal current velocity, and river discharge. Zooplankton samples were simultaneously obtained fortnightly at surface, mid-water, and bottom. The nets used were 50 cm in diameter, 1.5 m in length and 505 μm mesh size. The results indicated a postlarval seasonal immigration pattern, with the lowest average density values from March to May and October to November, and significantly higher values from June to September; maximum peaks occurred in June and September. High Pls densities were obtained between one and three hours after the tidal inflow started. Temperature and salinity varied little during each sampling period and had no apparent effect on immigration, but did have an effect on the seasonal abundance cycle. The multiple regression models indicated that the tidal current velocity and the temperature explained 86% of the variation in Pls abundance during immigration to the Terminos lagoon. The larval migration varied at different levels, with highest densities occurring at a medium depth of 5 m. The Pls entered an optimal range of tidal current velocity (between 0.6 and 0.9 m3 s-1). The main entry mechanism was through the tide current of the Selective Tide Stream Transport, where the Pls could also select an optimum current velocity, avoiding the strata of higher turbulence that would imply higher energy expenditures.
机译：研究了白虾对虾（Decapoda：对虾科）的幼体（Pls）向特米诺斯泻湖的迁移，以确定年丰度模式及其与温度，盐度，潮汐流速和河流流量的关系。每两周在水面，中层水面和底部同时采集浮游动物样品。所用网的直径为50厘米，长度为1.5 m，筛孔尺寸为505μm。结果表明，是一种幼虫后的季节性移民方式，3月至5月和10月至11月的平均密度值最低，而6月至9月则更高。最高峰出现在六月和九月。在潮汐开始流入一到三小时后，获得了较高的Pls密度。在每个采样期间，温度和盐度变化不大，对移民没有明显影响，但对季节性丰度周期有影响。多元回归模型表明，潮汐速度和温度解释了迁移至特米诺斯泻湖期间Pls丰度变化的86％。幼虫迁移在不同的水平上有所不同，最高密度发生在5 m的中等深度。 Pls进入了潮汐速度的最佳范围（介于0.6和0.9 m3 s-1之间）。主要的进入机制是通过选择性潮汐流传输的潮汐电流，Pls还可以选择一个最佳流速，从而避免了更高的湍流层，这意味着更高的能量消耗。

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