Understanding the effects of recreational catch‐and‐release angling on an increasingly important foreign fishing tourism species, the giant African threadfin Polydactylus quadrifilis (Cuvier)
2020
Butler, Edward Claude | Childs, Amber‐Robyn | Duncan, Murray Ian | Potts, Warren Mason
Foreign fishing tourism (FFT) is becoming increasingly popular in the developing world, where it often coexists alongside other important sectors involving domestic recreational anglers and dependant artisanal and subsistence fishing communities. Therefore, it is important that FFT operations use effective catch‐and‐release (C&R) angling to minimise negative impacts to locally important fishery species. Using reflex action mortality predictors (RAMPs) and physiological stress indicators, this study assessed the impacts of C&R angling within the FFT fishery targeting Polydactylus quadrifilis (Cuvier) on the Kwanza Estuary, Angola. Air exposure (cumulative link model (CLM): Z = 3.99, p < 0.01) and its interaction with fight time (Z = −2.377, p = 0.02) significantly predicted increased motor impairment. Handling practices were particularly important for larger reproductively valuable individuals as fish size was positively correlated with fight (Spearman's rank: r = 0.85, p < 0.01) and total times (r = 0.70, p < 0.01). Therefore, large fish should be handled in the water and a maximum air exposure time of 40 s is recommended for smaller fish. It is suggested that RAMP assessments can provide quick and effective tests for C&R‐driven impairment and provisions should be made for impaired individuals to recover adequately before release.
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