Introduction to New Zealand's Jack Mackerel Fisheries

New Zealand's fisheries sector plays a vital role in the national economy, with jack mackerels forming a key component of the pelagic catch. The 2026 update on catch per unit effort (CPUE) for these species provides critical insights into stock health in the JMA 7 management area. CPUE, or catch per unit effort, serves as a key indicator of fish abundance, calculated by dividing total catch by the fishing effort expended, such as hours trawled or vessel days at sea.

Background on Jack Mackerel Species in NZ Waters

Three main species contribute to New Zealand's jack mackerel catches: the native greenback jack mackerel (Trachurus declivis), yellowtail jack mackerel (Trachurus novaezelandiae), and the Chilean jack mackerel (Trachurus murphyi), which periodically migrates into local waters. In JMA 7, off the west coast of the North Island, greenback jack mackerel dominates recent catches at around 80 percent, followed by yellowtail. These species support a midwater trawl fishery focused in areas like the Taranaki Bight.

The 2026 Fisheries Assessment Report Overview

The latest rapid update of CPUE data, released as Fisheries Assessment Report 2026/08 by Fisheries New Zealand, covers trends from 1990 through 2024. This report builds on observer sampling that allows species-specific estimates despite combined reporting under the generic JMA code. Standardised CPUE series help track abundance changes, accounting for factors like vessel efficiency and environmental variables.

Key findings indicate that both greenback and yellowtail jack mackerels were likely at or above target biomass levels in 2024. The assessment suggests sustainable harvesting practices are maintaining stock health, with implications for quota management under the Quota Management System.

Understanding CPUE Methodology in Detail

CPUE standardisation involves statistical models that adjust raw catch rates for confounding variables. For instance, increases in fishing power over time, such as larger nets or better sonar, are accounted for to avoid underestimating declines in fish numbers. In JMA 7, data from midwater trawlers provide the primary index. Observer coverage enables separation of species proportions, with greenback jack mackerel showing stable or improving trends.

Step-by-step, the process includes: collecting logbook data on catch and effort; applying generalised linear models; and validating against biological sampling like length and age compositions. This rigorous approach ensures the index reflects true population dynamics rather than just fishing changes.

Current Stock Status and Key Statistics

According to the 2026 report, greenback jack mackerel biomass in JMA 7 (and likely shared with JMA 3) remains robust. Yellowtail populations also show positive signs. Catches have been stable, with total allowable catches (TACs) set to balance commercial needs and sustainability. Recent data reveal no immediate concerns of overfishing, supporting continued access for the fishing industry.

• Greenback jack mackerel: Approximately 80% of JMA 7 catch
• Yellowtail jack mackerel: Majority of remaining catch
• Chilean jack mackerel: Minimal presence in JMA 7

Regional Context and Stakeholder Perspectives

Fisheries in New Zealand operate within strict regulatory frameworks managed by the Ministry for Primary Industries. Commercial fishers, iwi representatives, and environmental groups all have input through stakeholder consultations. The CPUE update reassures industry participants while highlighting the need for ongoing monitoring amid climate variability and potential shifts in migratory patterns.

Impacts on Economy and Environment

Healthy jack mackerel stocks contribute millions to New Zealand's export earnings, particularly through processed products for international markets. Environmentally, sustainable CPUE levels reduce bycatch risks and support ecosystem balance in pelagic zones. Challenges include adapting to ocean warming, which may alter distribution, but current data suggest resilience.

Future Outlook and Recommendations

Looking ahead to 2026 and beyond, continued CPUE monitoring will be essential. Recommendations include increased observer coverage and integration with acoustic surveys for more precise biomass estimates. Projections indicate stable or increasing biomass under current management, offering a positive outlook for quota holders and coastal communities.

For more details on the full report, visit the official Fisheries New Zealand document library.

Photo by Museums Victoria on Unsplash

Conclusion and Actionable Insights

The 2026 Jack Mackerel CPUE update underscores New Zealand's commitment to science-based fisheries management. By maintaining stocks above target levels, the sector demonstrates sustainable practices that balance economic benefits with environmental stewardship. Stakeholders are encouraged to review the report for informed decision-making in the upcoming fishing year.