Efficiency and species selectivity of baited galvanized wire gauze trap in Abule Agege and Abule Eledu Creeks of the Lagos Lagoon

Author: B. E. Emmanuel and A. B. Obafemi
Abstract:
An investigation into the effectiveness and selectivity of wire gauze traps (total = 20) in Abule Agege and Abule Eledu Creeks was conducted between March – August 2019. Processed cassava (Fufu) and coconut were used as baits, and the traps were set – up day and night. The swimming crab (Callinectes amnicola) was the most abundant shellfish from both Creeks with 73 and 72.13% occurrence respectively. Sarotherodon melanotheron was the most abundant fin fish caught in the study with the highest catch recorded in the month of July in Abule Eledu Creek where nine specimens were caught per trap. Cardiosoma armatum had the lowest number of catch rate in both creeks where occurrences of 1.5 and 1.63% were recorded respectively in both creeks. The catch recorded using this gear was relatively low which made it not very efficient for artisanal fishing in the creeks. The fufu baited trap was recorded to catch higher number of species compared to the coconut baited trap. Except for salinity, which varied greatly from 0.384% in July to 0.93% in August and Total Suspended Solid which ranged between 104.0 and 140.0ppm in July and August, the physicochemical parameters of the two sampling stations fluctuated throughout the sampling period. The selected trap was selective for shallow water species, but the catch rate was low due to human activity on the water body during the sampling period. Due to its high selectivity, the selected fishing gear will be best suited to help improve species abundance in the ecosystem.

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Key Words: Galvanized Wire Gauze, Selectivity, Creeks, Baits, Trap efficiency
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