Card image

Journal of Aquaculture Engineering and Fisheries Research

Opinion - (2023) Volume 9, Issue 3

Effects of aging on the skin and gill microbiota of farmed sparid fish and saltwater fish
Allen Mavuru*
Department of Biological Sciences, University of Zimbabwe, Zimbabwe
*Correspondence: Allen Mavuru, Department of Biological Sciences, University of Zimbabwe, Zimbabwe, Email:

Received: Mar 01, 2023, Manuscript No. JAEFR-23-103380; Editor assigned: Mar 03, 2023, Pre QC No. JAEFR-23-103380 (PQ); Reviewed: Mar 17, 2023, QC No. JAEFR-23-103380; Revised: Mar 22, 2023, Manuscript No. JAEFR-23-103380 (R); Published: Mar 29, 2023, DOI: 10.3153/JAEFR.9.3.030


Gill nets are a widely used fishing gear consisting of vertical panels of netting suspended in the water column. While they have been employed for centuries to catch fish and other marine organisms, the use of gill nets has garnered significant criticism due to their detrimental effects on marine ecosystems and sustainability. This article aims to explore the disadvantages of gill nets, shedding light on the environmental, ecological, and ethical concerns associated with their use. One of the most concerning issues related to gill nets is their high rates of bycatch, which refers to the unintentional capture of non-targeted species. The design of gill nets makes them indiscriminate, trapping not only the intended species but also a wide range of other marine life, including mammals, sea turtles, seabirds, and noncommercial fish species. Bycatch can result in significant mortality and injury to these non-targeted species, leading to population declines, disruptions in marine food chains, and ecological imbalances. Gill nets, especially those used in bottom trawling, can cause significant damage to marine habitats. When deployed in sensitive environments such as coral reefs, seagrass meadows, or rocky seabeds, gill nets can snag and tear the fragile structures and uproot vital vegetation. This destruction has far-reaching consequences, affecting the entire ecosystem, including the loss of critical nursery areas for juvenile fish, decreased habitat complexity, and the decline of associated species. Ghost fishing refers to the phenomenon where lost or abandoned gill nets continue to catch and kill marine organisms, even when no longer tended by fishermen.


These "ghost nets" can drift in the ocean currents for extended periods, trapping and ensnaring marine life, leading to death through suffocation, starvation, or entanglement. Additionally, gill nets can break or be discarded at sea, contributing to the accumulation of marine debris, which poses hazards to marine animals and has adverse effects on marine ecosystems. Gill nets have been associated with overfishing and unsustainable harvesting practices. The use of large-scale gill nets can lead to the rapid depletion of target fish populations, disrupting the delicate balance within marine ecosystems. Furthermore, the lack of selectivity in gill nets means that even smaller, immature fish are caught, preventing them from reaching reproductive age and negatively impacting future generations. Such unsustainable practices can have long-lasting effects on fish stocks, leading to economic losses for fishing communities and jeopardizing food security. Gill nets pose a severe threat to endangered marine species. Many species, such as sea turtles, cetaceans, and sharks, are unintentionally caught in gill nets, often resulting in their injury or death.


While gill nets have been widely used as a fishing technique, it is essential to recognize their significant disadvantages and adverse impacts on marine ecosystems and sustainability. The high rates of bycatch, habitat destruction, ghost fishing, unsustainable fishing practices, threats to endangered species, and ethical concerns are all pressing issues that demand attention and action. Governments, fishing communities, and the fishing industry must work together to explore alternative fishing methods and adopt more sustainable practices that prioritize the conservation of marine biodiversity and the long-term health of our oceans. Only through responsible fishing practices can we ensure a balanced and thriving marine ecosystem for future generations.