伊利湖俄亥俄水域淡水鼓和水牛 Ictiobus spp.的商业捕捞和种群特征

IF 1.4 4区 环境科学与生态学 Q3 ECOLOGY
Graham F. Montague, Douglas L. Zentner, Richard A. Snow, Jory B. Bartnicki, Daniel E. Shoup, Brian A. Schmidt
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引用次数: 0

摘要

伊利湖有许多本地非野生鱼类,包括淡水鼓、大口水牛和小口水牛。俄亥俄州伊利湖水域的商业渔业对这些物种没有具体规定。我们查阅了这些物种的商业捕捞记录,并利用独立于渔业的样本对种群特征(大小结构、年龄和生长、成熟时的长度和年龄、繁殖变异性和死亡率)进行了量化。随着时间的推移,商业捕捞量普遍下降,但商业捕捞总量却在增加,这表明种群数量有可能增加。每种鱼的生长都存在性别二形性,雌鱼的体型比雄鱼大。年总死亡率为 6.7-12.2%,繁殖变异指数在 0.44 至 0.51 之间。所有物种的大多数鱼类在 6 或 7 龄成熟,淡水鼓的最大观察年龄为 56 岁,水牛的最大观察年龄为 48 岁。纯捕捞过剩产量模型表明,淡水鼓和水牛鱼种的过度捕捞过去曾发生过,现在很可能仍在继续。然而,这些结果与收集到的渔业生物信息(即年龄结构、生长和繁殖)不符。我们认为,该渔业目前可能存在一定程度的过度捕捞;但是,应当对捕捞情况进行更详细的评估(即有关大小结构的信息,而不是去除的总生物量),以确保能够对其进行可持续管理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Commercial harvest and population characteristics of freshwater drum and buffalo Ictiobus spp. in Ohio waters of Lake Erie

Commercial harvest and population characteristics of freshwater drum and buffalo Ictiobus spp. in Ohio waters of Lake Erie

Lake Erie supports many native nongame fishes including freshwater drum, bigmouth buffalo, and smallmouth buffalo. Commercial fisheries in Ohio waters of Lake Erie have no specific regulations on these species. We reviewed the commercial harvest records for these species and quantified population characteristics (size structure, age and growth, length and age at maturity, recruitment variability, and mortality rates) with fishery-independent samples. Commercial harvest effort has generally declined through time, but commercial harvest totals have increased, suggesting potential increases in population size. Sexually dimorphic growth occurred for each species, with females attaining larger sizes than males. Total annual mortality was 6.7–12.2% and recruitment variability indexes ranged from 0.44 to 0.51. Most fish of all species matured by age 6 or 7, and maximum observed ages were 56 years for freshwater drum and 48 years for buffalo species. A catch-only surplus production model suggested overharvest of freshwater drum, and buffalo species has occurred in the past and is likely ongoing. However, these results disagree with biological information collected on the fishery (i.e., age structure, growth, and recruitment). We suggest it is likely some level of overharvest is currently occurring in this fishery; however, more detailed assessment of harvest (i.e., information about size structure rather than aggregate total biomass removed) should be conducted to ensure it can be sustainably managed.

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来源期刊
Environmental Biology of Fishes
Environmental Biology of Fishes 环境科学-海洋与淡水生物学
CiteScore
2.60
自引率
14.30%
发文量
169
审稿时长
3 months
期刊介绍: Environmental Biology of Fishes is an international journal that publishes original studies on the ecology, life history, epigenetics, behavior, physiology, morphology, systematics and evolution of marine and freshwater fishes. Empirical and theoretical papers are published that deal with the relationship between fishes and their external and internal environment, whether natural or unnatural. The journal concentrates on papers that advance the scholarly understanding of life and draw on a variety of disciplines in reaching this understanding. Environmental Biology of Fishes publishes original papers, review papers, brief communications, editorials, book reviews and special issues. Descriptions and submission requirements of these article types can be found in the Instructions for Authors.
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