Understanding the effects of egg loss from fisher handling to improve conservation of a threatened freshwater crayfish (Euastacus armatus)

IF 1.8 4区环境科学与生态学 Q2 FISHERIES

Marine and Freshwater Research Pub Date : 2024-05-07 DOI:10.1071/mf23180

S. M. C. Raymond, C. R. Todd, J. Ryall

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引用次数: 0

Abstract

Context

Handling of wild animals can have adverse effects on individuals that scale up to affect populations and ultimately species. Limited mobility and high harvest pressure expose the threatened Australian freshwater crayfish (Euastacus armatus) to multiple handling events by fishers that cause egg loss.

Aim

Our aim was to assess the effects from harvest pressure on the reproductive output of an E. armatus population.

Methods

A stochastic model based on empirical data and estimated harvest pressures was used to predict the effect of repetitive handling of individuals on a population of E. armatus subject to harvest and consequent egg loss.

Key results

Egg loss resulted in substantial predicted population-level declines, most pronounced in populations subject to high and extreme harvest pressures.

Conclusions

We advocate educating fishers to visually determine the reproductive condition of female crayfish by inspecting gonopore setation, eliminating the need for unfurling the tail.

Implications

Maximising species reproductive output through limiting handling loss supports the management and conservation of E. armatus populations.

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了解渔民处理鱼卵对改善受威胁淡水小龙虾（Euastacus armatus）保护的影响

背景处理野生动物会对个体产生不利影响，进而影响种群，最终影响物种。有限的流动性和高采捕压力使濒危的澳大利亚淡水小龙虾（Euastacus armatus）受到渔民的多次处理，从而导致卵的损失。目的我们的目的是评估捕捞压力对 E. armatus 种群繁殖产量的影响。方法利用基于经验数据和估计捕捞压力的随机模型，预测重复处理个体对受捕捞影响的银鳕鱼种群的影响以及由此导致的卵损失。主要结果卵损失导致了预测种群水平的大幅下降，在遭受高强度和极端捕捞压力的种群中最为明显。结论我们提倡教育渔民通过检查生殖孔的设置来目测雌性小龙虾的生殖状况，而无需展开尾部。影响通过限制处理损失来最大限度地提高物种的生殖产量，有助于E. armatus种群的管理和保护。

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来源期刊

Marine and Freshwater Research 环境科学-海洋学

CiteScore

4.60

自引率

5.60%

发文量

审稿时长

3.8 months

期刊介绍： Marine and Freshwater Research is an international and interdisciplinary journal publishing contributions on all aquatic environments. The journal’s content addresses broad conceptual questions and investigations about the ecology and management of aquatic environments. Environments range from groundwaters, wetlands and streams to estuaries, rocky shores, reefs and the open ocean. Subject areas include, but are not limited to: aquatic ecosystem processes, such as nutrient cycling; biology; ecology; biogeochemistry; biogeography and phylogeography; hydrology; limnology; oceanography; toxicology; conservation and management; and ecosystem services. Contributions that are interdisciplinary and of wide interest and consider the social-ecological and institutional issues associated with managing marine and freshwater ecosystems are welcomed. Marine and Freshwater Research is a valuable resource for researchers in industry and academia, resource managers, environmental consultants, students and amateurs who are interested in any aspect of the aquatic sciences. Marine and Freshwater Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.