Sediment preference of coastal horseshoe crab (Tachypleus gigas) in an artificial spawning ground

IF 1.8 4区环境科学与生态学 Q2 FISHERIES

Marine and Freshwater Research Pub Date : 2024-07-30 DOI:10.1071/mf23111

Anis Syahira Abdul Halim, Mhd Ikhwanuddin, Noraznawati Ismail, Mariam Taib, Faridah Mohamad

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引用次数: 0

Abstract

Context

Spawning beaches are important for coastal horseshoe crabs, Tachypleus gigas (Müller, 1785), to sustain their population. Over time, T. gigas natural spawning area has gradually diminished owing to human and natural causes. T. gigas is being artificially bred in captivity to enhance its population.

Aims

The study aims to determine the T. gigas spawning preference for three different sediment sizes.

Methods

Spawning experiments were carried out in an indoor concrete tank representing an artificial spawning ground, consisting of three combinations of sediment sizes: coarse, medium and fine. The spawning of 45 pairs of T. gigas samples was observed within 3 h, the nests were marked and excavated on the next day. The number of eggs per nest was counted individually after being cleaned.

Key results

The 45 pairs of T. gigas produced 27,266–30,859 eggs. Among these, on the basis of the number of nests produced, T. gigas prefers to spawn in medium to coarse sediment with a particle-size range of 0.25–1.00 mm.

Conclusions

Our findings indicated that medium to coarse sediments are optimal for T. gigas spawning in artificial spawning grounds, because they could produce a high number of nests and eggs, increasing the number of juveniles released.

Implications

These results could be used as a baseline for the conservation management of T. gigas in captivity.

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人工产卵场中沿海鲎对沉积物的偏好

背景产卵海滩对沿海鲎（Tachypleus gigas，Müller，1785 年）维持其种群数量非常重要。随着时间的推移，由于人为和自然原因，吉氏鲎的自然产卵区逐渐减少。目前，人们正在人工繁殖吉贝，以增加其数量。目的本研究旨在确定千吉鱼对三种不同大小沉积物的产卵偏好。方法产卵实验在一个室内混凝土水箱中进行，该水箱是一个人工产卵场，由粗、中、细三种大小的沉积物组合而成。在 3 小时内观察了 45 对千岛湖样本的产卵情况，第二天对巢穴进行标记和挖掘。清理后逐个计算每个巢的卵数。主要结果45对千层塔产卵27266-30859枚。其中，根据产卵巢的数量，大菱鲆喜欢在粒径范围为 0.25-1.00 mm 的中粗沉积物中产卵。结论我们的研究结果表明，在人工产卵场中，中粗沉积物是千层塔鱼产卵的最佳选择，因为它们能产生大量的巢和卵，增加释放的幼鱼数量。意义这些结果可作为人工饲养的吉氏巨蜥保护管理的基线。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.