{"title":"Reproductive dynamics of striped marlin (Kajikia audax) in the central North Pacific","authors":"Robert L. Humphreys Jr, Jon K. T. Brodziak","doi":"10.1071/mf23192","DOIUrl":null,"url":null,"abstract":"<strong> Context</strong><p>Within the western and central North Pacific Ocean stock of striped marlin (<i>Kajikia audax</i>), reproductive information is lacking for the central North Pacific.</p><strong> Aims</strong><p>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.</p><strong> Methods</strong><p>Gonad histology was exclusively used to confirm sex and estimate all reproductive life history traits.</p><strong> Key results</strong><p>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.</p><strong> Conclusions</strong><p>Length-at-maturity estimates for the central North Pacific are lower than all sex-specific estimates reported from other Pacific regions.</p><strong> Implications</strong><p>The new maturity estimates will improve determinations of stock resilience and productivity in upcoming international assessments.</p>","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"60 1","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine and Freshwater Research","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1071/mf23192","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FISHERIES","Score":null,"Total":0}
引用次数: 0
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.
期刊介绍：
Marine and Freshwater Research is an international and interdisciplinary journal publishing contributions on all aquatic environments. The journal’s content addresses broad conceptual questions and investigations about the ecology and management of aquatic environments. Environments range from groundwaters, wetlands and streams to estuaries, rocky shores, reefs and the open ocean. Subject areas include, but are not limited to: aquatic ecosystem processes, such as nutrient cycling; biology; ecology; biogeochemistry; biogeography and phylogeography; hydrology; limnology; oceanography; toxicology; conservation and management; and ecosystem services. Contributions that are interdisciplinary and of wide interest and consider the social-ecological and institutional issues associated with managing marine and freshwater ecosystems are welcomed.
Marine and Freshwater Research is a valuable resource for researchers in industry and academia, resource managers, environmental consultants, students and amateurs who are interested in any aspect of the aquatic sciences.
Marine and Freshwater Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.
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