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首页> 外文期刊>ICES Journal of Marine Science >The use of market sampling to generate maturity ogives and to investigate growth, sexual dimorphism and reproductive strategy in central and south-western North Sea sole (Solea solea L.)
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The use of market sampling to generate maturity ogives and to investigate growth, sexual dimorphism and reproductive strategy in central and south-western North Sea sole (Solea solea L.)

机译：使用市场抽样来生成成熟目标，并调查北海中部和西南部海底（Solea solea L.）的生长，性二态性和生殖策略

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摘要

The influence of body size, age, geographical distribution, year and season on the sexual maturation of Dover sole (Solea solea L.) in the North Sea was investigated using market sampling data collected from fish landed by commercial fishing vessels at English ports on a monthly basis since 1983. A comparison was made with maturity estimates for sole derived from research vessel survey data. The market sampling data were summarized using general linear modelling and used to generate maturity ogives for sole. There are a number of uncertainties with this approach, stemming from the use of the commercial fishery to provide the fish samples and reliance on visual (macroscopic) staging to ascertain the stage of sexual maturation of the gonads. Despite the inability to resolve all uncertainties, it was felt that it should be feasible to derive general-purpose maturity ogives from market sampling data, and that these should be sufficiently reliable for use in assessing the spawning stock biomass of North Sea Dover sole. Male and female sole were shown to have different growth and reproductive strategies, with the emphasis being directed towards maximizing egg production. Current stock assessments for sole assume that sexual maturation is knife-edged, with all fish maturing at 3 years of age. Evidence is presented to show that this approach is likely to inflate estimates of spawning stock size, since not all 3-year-olds spawn, and the proportion that do spawn varies annually. Size selection pressures resulting from commercial fishing practices are also likely to further inflate estimates of the spawning stock size. In addition, reproductive investment in first time spawning females was found to be substantially lower than in older established spawners, and it is the latter which are the first to become depleted through the pressure of sustained size-selective fishing. As a consequence, the current view of the state of well being of the North Sea sole spawning stock is likely to be overly optimistic.
机译：使用从商业捕鱼船在英国港口上岸的鱼类收集的市场抽样数据，研究了体型，年龄，地理分布，年份和季节对北海多佛鱼sole（Solea solea L.）性成熟的影响。自1983年以来，每月的月底价格。与研究船调查数据得出的唯一鞋底的成熟度估算值进行了比较。市场抽样数据使用通用线性建模进行了汇总，并用于生成鞋底的成熟对象。这种方法存在许多不确定性，这是由于使用商业性渔业来提供鱼样品以及依靠视觉（宏观）分期来确定性腺的性成熟阶段所致。尽管无法解决所有不确定性，但人们认为从市场采样数据中得出通用到期债务应该是可行的，并且应该足够可靠以用于评估北海多佛底的产卵生物量。男性和女性唯一的脚底显示出不同的生长和繁殖策略，重点是最大限度地提高产蛋量。当前唯一的种群评估假设性成熟是边缘化的，所有鱼类均在3岁时成熟。证据表明，这种方法可能会增加对产卵种群规模的估计，因为并非所有3岁的产卵者，而且产卵的比例每年都在变化。商业捕鱼活动造成的尺寸选择压力也可能进一步增加对产卵种群规模的估计。此外，发现第一次产卵的雌性的生殖投资大大低于已建立的较老的产卵者，而后者是由于持续进行大小选择性捕捞的压力而第一个消耗的。因此，目前对北海唯一产卵种群健康状况的看法可能过于乐观。

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