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RESEARCH ARTICLE

Reproductive dynamics of striped marlin (Kajikia audax) in the central North Pacific

Robert L. Humphreys Jr https://orcid.org/0000-0001-7360-5586 A B * and Jon K. T. Brodziak A B
+ Author Affiliations
- Author Affiliations

A National Oceanic and Atmospheric Administration, Pacific Islands Fisheries Science Center, 1845 Wasp Boulevard, Building 176, Honolulu, HI 96818, USA.

B University of Hawaii at Manoa, Marine Biology Graduate Program, Hawaii Institute of Geophysics 131A, 2525 Correa Road, Honolulu, HI 96822, USA.

* Correspondence to: rhumphre@hawaii.edu

Handling Editor: Haseeb Randhawa

Marine and Freshwater Research 75, MF23192 https://doi.org/10.1071/MF23192
Submitted: 25 August 2023  Accepted: 6 February 2024  Published: 13 March 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Within the western and central North Pacific Ocean stock of striped marlin (Kajikia audax), reproductive information is lacking for the central North Pacific.

Aims

To derive estimates of sex-specific functional maturity ogives, eye-to-fork length at 50% maturity, reproductive phase composition, spawning season and sex ratios by sampling the Hawaii-based pelagic longline fishery.

Methods

Gonad histology was exclusively used to confirm sex and estimate all reproductive life history traits.

Key results

Females spawn in May–July; males are capable of spawning year-round. Best length at 50% maturity estimates were based on datasets restricted to the female spawning season (eye–fork length for females 152.2 cm and for males 109.0 cm). Length distributions and sex ratios are seasonally dynamic around Hawaii and differ from those in other Pacific regions.

Conclusions

Length-at-maturity estimates for the central North Pacific are lower than all sex-specific estimates reported from other Pacific regions.

Implications

The new maturity estimates will improve determinations of stock resilience and productivity in upcoming international assessments.

Keywords: billfish, central North Pacific, functional maturity ogive, gonad histology, Hawaii-based pelagic longline fishery, length at maturity, length distribution, sex ratio, spawning season, stock mixing, striped marlin.

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