Life-history Parameters of Shield-Head Catfish Synodontis Schall (Bloch and Schneider, 1801) in the Nile River, Egypt

Sahar Fahmy Mehanna
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Sahar Fahmy Mehanna: Fish Population dynamics lab, Fisheries Division, National Institute of Oceanography and Fisheries (NIOF), Egypt

Journal of Agriculture and Crops, 2022, vol. 8, issue 2, 87-93

Abstract: Age and growth, mortality, and exploitation level of the shield-head catfish Synodontis schall inhabiting River Nile, Egypt are studied to evaluate its fishery status and proposed some reference points for its sustainability. A total number of 805 specimens comprising of 306 males and 499 females with the size range of 16.7 - 37.8 cm TL (mean = 26.71 ± 3.58) were investigated. The weight of specimens ranged from 60.0 to 650 g (mean = 194.88 ± 26.58). Statistically, there is no difference between males and females in the longevity and population parameters so all parameters were estimated for sexes combined. The maximum life span of this species was 4 years based on the pectoral fin spine sections. Asymptotic total length (L?) was 42.25 cm, growth coefficient (K) was 0.42 yr-1, and theoretical age at zero-length (t0) was -0.36 yr, while the growth performance index (Ø’) was 2.87. The instantaneous total, natural, and fishing mortality coefficients were 1.23, 0.54, and 0.69 yr-1, respectively. The Exploitation rate (E) was 0.56. The body length at first sexual maturity (Lm) and mean selection length (Lc) were estimated at 24.1 and 23.6 cm, respectively. There is selective fishing mortality towards smaller fish sizes reflecting the adverse impact of fishing effort. Therefore, for management purposes, it is recommended to increase the length at first capture to maintain sufficient spawning biomass for recruitment and monitoring the exploitation level to control the fishing effort.

Keywords: Nile; Synodontis schall; Population parameters; Selectivity; Management. (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:arp:jacarp:2022:p:87-93

DOI: 10.32861/jac.82.87.93

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