Download FAR 2025/49 Investigating length-based management procedures for Trachurus novaezelandiae in the Bay of Plenty purse-seine fishery

Neubauer, P.; Kim, K.; Middleton, D.A.J.; Cook, D.; A’mar, T. (2025). Investigating length-based management procedures for Trachurus novaezelandiae in the Bay of Plenty purse-seine fishery. New Zealand Fisheries Assessment Report 2025/49. 78 p.

This study evaluated using fish length to adjust catch limits for a jack mackerel species in New Zealand waters, with a view to developing simple length metrics to help manage this species. The effectiveness of length-based management depended greatly on biological factors like recruitment, growth, and natural mortality. Current uncertainties about these factors make length-based rules less reliable than expected. Alternative approaches using age data might provide a better way to support sustainable management of this species.