The natural mortality rates and fecundity of Red Snapper Lutjanus campechanus vary substantially by age, so the age composition of catch is an important consideration when quantifying the relative effects of catch on the Red Snapper population across different fisheries. For example, the shrimp fishery catches many (but younger) Red Snapper, whereas directed commercial and recreational fisheries catch fewer (but older) individuals. We propose a simple approach for comparing catch across sectors. Fish that are caught can be scaled to a common age by multiplying or dividing by natural mortality rates so that the catch data can then be reported in “common age units.” Applying this approach to the catch data from the 2018 Red Snapper stock assessment, we showed that the shrimp‐trawl bycatch typically accounts for <10% of the relative catch, the commercial sectors account for ~32%, and the recreational sectors are responsible for ~59%. We believe that the effective management of Red Snapper requires regulation and oversight of each fishery that is proportional to its effect on the population. Given the apparently large influence of recreational fisheries on Red Snapper populations, recent management changes that delegate state‐by‐state control over important aspects of the recreational fishery (Amendment 50) should be accompanied by efforts to improve the understanding of this sector's interactions with Red Snapper.

中文翻译：

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使用常见年龄单位来传达墨西哥湾休闲，商业和虾类渔业中红鲷鱼的相对数量

红鲷鱼Lutjanus campechanus的自然死亡率和繁殖力因年龄而异，因此，在量化渔获对不同渔业中红鲷鱼种群的相对影响时，渔获的年龄构成是一个重要的考虑因素。例如，对虾捕捞捕获了很多（但较年轻）的红鲷鱼，而定向商业和休闲捕捞则捕获了较少（但较老）的个体。我们提出了一种比较跨部门渔获量的简单方法。可以通过乘以或除以自然死亡率将被捕捞的鱼按比例缩放到一个普通年龄，这样就可以以“普通年龄单位”报告捕捞数据。将这种方法应用于2018年红鲷鱼种群评估中的捕捞数据后，我们发现虾拖网副渔获物通常占相对渔获物的<10％，商业部门约占32％，娱乐部门约占59％。我们认为，对红鲷鱼进行有效管理需要对每种渔业进行相应的监管和监督，这与其对种群的影响成正比。鉴于休闲渔业对红鲷鱼种群的影响很大，最近的管理变革要求州对休闲渔业的重要方面进行逐个州的控制（第50号修正案），同时应做出努力，以加深对该行业与红鲷鱼相互作用的了解鲷鱼。