330203

Population structure of two Octopus species, Amphioctopus aegina and A. membranaceus in the Gulf of Suez, Egypt.

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Last updated: 01 Jan 2025

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Abstract

Ageing of Amphioctopus. aegina and A. membranaceus revealed three different age groups, and the main bulk of the catch was represented in the second age group for the two species. Von Bertalanffy growth constants were determined as; L= 11.76 cm DML, K= 0.39 year-1, t0= 0.11 year-1 and Ø= 1.73 for A. aegina, and L= 11.47 cm DML, K= 0.45 year-1, t0= 0.33 year-1 and Ø= 1.77 for A. membranaceus. The total mortality (Z), natural mortality (M), fishing mortality (F) and exploitation rate (E) were calculated as 2.87, 1.17, 1.70 and 0.59 year-1, respectively for A. aegina, and 2.70, 1.29, 1.41 and 0.52 year-1, respectively for A. membranaceus. The length at recruitment (Lr) of A. aegina and A. membranaceus was 1.9 and 2.4 cm DML, that corresponding to age (tr) of 0.56 and 0.85 year, respectively. Length at first capture (Lc) was 6.28 and 4.05 cm DML for A. aegina and A. membranaceus, respectively, and the age at the first capture (tc) was 2.07 and 1.46 years, respectively. This study is very important for fisheries management in the Gulf of Suez, where, some recommendations to reduce the exploitation rates for the two Octopus species in the Gulf were proposed.

DOI

10.21608/ejabf.2023.330203

Keywords

Amphioctopus aegina, A. membranaceus, Age, Growth, mortality, exploitation rate

Authors

First Name

Ayman S.

Last Name

Ahmed et al.

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Volume

27

Article Issue

6

Related Issue

44335

Issue Date

2023-11-01

Receive Date

2023-12-13

Publish Date

2023-11-01

Page Start

775

Page End

789

Print ISSN

1110-6131

Online ISSN

2536-9814

Link

https://ejabf.journals.ekb.eg/article_330203.html

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https://ejabf.journals.ekb.eg/service?article_code=330203

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45

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Original Article

Type Code

103

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Journal

Publication Title

Egyptian Journal of Aquatic Biology and Fisheries

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https://ejabf.journals.ekb.eg/

MainTitle

Population structure of two Octopus species, Amphioctopus aegina and A. membranaceus in the Gulf of Suez, Egypt.

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Article

Created At

23 Dec 2024