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264477

Age, Growth and mortality of the rabbit fish Siganus rivulatus (Forsskål 1775) from the Egyptian Mediterranean coast off Alexandria, Egypt

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Last updated: 01 Jan 2025

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Abstract

The present work aimed to provide essential information to assess proper management for the rabbitfish, Siganus rivulatus on the Egyptian Mediterranean coast in Alexandria, Egypt. A total of 1116 specimens of rabbit fish were collected from the Egyptian Mediterranean coast off Alexandria during the fishing season of 2021 to study the length-weight relationship, age and growth, mortality rates and exploitation rate. The length-weight relationship showed that the S. revulatus growth was nearly isometric (b= 2.935). Age was determined by the otolith-reading technique and its longevity reached five years. The age groups (II+ and I+) were most abundant in the fishing sample. The back-calculation method estimated that the maximum annual increment in length (10.44 cm) was recorded during the first year of life; while the maximum annual increment in weight (23.54 g) was recorded during the fourth year of life. The values of the von Bertalanffy growth parameters were L∞ = 22.8 cm; W∞= 143.53 g; K = 0.341 year-1 and t0 = -1.376 year-1. The mean total mortality "Z" was 1.66 year-1. The natural mortality "M" was estimated as 0.68 year-1, and the fishing mortality rate (F) was 0.95 year-1. The exploitation rate (E) was estimated as 0.59. The length at first catch was 14.56 cm.

DOI

10.21608/ejabf.2022.264477

Keywords

Siganus rivulatus, length-weight, population, age and growth, Mortality rates, exploitation rate

Authors

First Name

Mohammed G.

Last Name

Desouky et al.

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Volume

26

Article Issue

5

Related Issue

36591

Issue Date

2022-09-01

Receive Date

2022-10-08

Publish Date

2022-09-01

Page Start

557

Page End

569

Print ISSN

1110-6131

Online ISSN

2536-9814

Link

https://ejabf.journals.ekb.eg/article_264477.html

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https://ejabf.journals.ekb.eg/service?article_code=264477

Order

32

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Original Article

Type Code

103

Publication Type

Journal

Publication Title

Egyptian Journal of Aquatic Biology and Fisheries

Publication Link

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

MainTitle

Age, Growth and mortality of the rabbit fish Siganus rivulatus (Forsskål 1775) from the Egyptian Mediterranean coast off Alexandria, Egypt

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Article

Created At

22 Jan 2023