Catch and release helps conserve fish, 20-year study finds
According to the Zululand Observer, in the build-up to MPA Day on August 1, South African scientist Dr Bruce Mann highlights the value of these 'nature reserves of the sea'.
'MPAs provide many benefits for both ocean health and human activities,' said Mann, a research associate at the Oceanographic Research Institute in Durban.
'One benefit is that they enable fish stocks to increase in abundance and biomass and, over time, these spill over into adjacent fished areas, improving catches and ensuring fisheries' sustainability.'
One thing that stands out to Mann is that these conservation areas give a clear view of what nature looks like without human impact.
'This forms a useful 'control', which provides a solid foundation for our research into the natural world and the conservation techniques needed. By looking after these special places, we can make a real difference.'
He shared three examples of MPAs: A Scotsman tagged in the Pondoland Marine Protected Area (Eastern Cape); a giant kingfish tracked from southern Mozambique to the Eastern Cape; and catch and release angling at iSimangaliso Wetland Park in KZN.
A 20-year study in the iSimangaliso MPA tested whether catch and release can help conserve shore angling species.
The study tagged fish caught by volunteer anglers in zoned areas within the MPA.
The findings showed that when best-practice handling was used, catch and release angling had minimal impact on most species, though more sensitive species still showed higher post-release mortality, especially under increased angling pressure.
The study concluded that while catch and release is not suitable in strict no-take zones, it offers real conservation value as a buffer around MPAs or in specially zoned areas.
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