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 | ||||
| Article 32, Volume 26, Issue 5, September and October 2022, Page 557-569 PDF (833.16 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2022.264477 | ||||
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| Author | ||||
| Mohammed G. Desouky et al. | ||||
| 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. | ||||
| Keywords | ||||
| Siganus rivulatus; Length-weight; Population; Age and growth; Mortality rates; Exploitation rate | ||||
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