Desouky et al., M. (2022). Age, Growth and mortality of the rabbit fish Siganus rivulatus (Forsskål 1775) from the Egyptian Mediterranean coast off Alexandria, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 26(5), 557-569. doi: 10.21608/ejabf.2022.264477
Mohammed G. Desouky et al.. "Age, Growth and mortality of the rabbit fish Siganus rivulatus (Forsskål 1775) from the Egyptian Mediterranean coast off Alexandria, Egypt". Egyptian Journal of Aquatic Biology and Fisheries, 26, 5, 2022, 557-569. doi: 10.21608/ejabf.2022.264477
Desouky et al., M. (2022). 'Age, Growth and mortality of the rabbit fish Siganus rivulatus (Forsskål 1775) from the Egyptian Mediterranean coast off Alexandria, Egypt', Egyptian Journal of Aquatic Biology and Fisheries, 26(5), pp. 557-569. doi: 10.21608/ejabf.2022.264477
Desouky et al., M. Age, Growth and mortality of the rabbit fish Siganus rivulatus (Forsskål 1775) from the Egyptian Mediterranean coast off Alexandria, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 2022; 26(5): 557-569. doi: 10.21608/ejabf.2022.264477
Age, Growth and mortality of the rabbit fish Siganus rivulatus (Forsskål 1775) from the Egyptian Mediterranean coast off Alexandria, Egypt
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.
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