Article by: Nur Hidayahanum Hamid

Source: German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig

The pressures of intense fishing and overexploitation have led to significant evolutionary adaptations in fish populations, such as cod, resulting in diminished growth rates, smaller sizes at maturity, and earlier reproductive cycles. These changes have ultimately reduced both their productivity and market value.

Research conducted by German and Norwegian scientists indicates that it is feasible to reverse these trends through the implementation of more sustainable fisheries management practices, which would have a minimal impact on profits while simultaneously restoring genetic diversity. While short-term strategies can aid in the recovery of stock biomass, addressing the evolutionary decline necessitates a long-term management approach spanning decades. Conservation efforts aimed at enhancing genetic diversity should be prioritized within global initiatives, including the Sustainable Development Goals (SDGs). Additionally, selective fishing methods that take genetic factors into account could facilitate a quicker recovery, yielding both environmental and economic advantages in the long run.

Picture 1: Two mature male Baltic cod of different body size. Growth rate, size and age at maturity have declined in several cod stocks owing to intense fishing in the past. (Credit Photo: Jan Dierking, GEOMAR Helmholtz Centre for Ocean Research Kiel)

Date of Input: 15/08/2024 | Updated: 15/08/2024 | hidayahanum