Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management
Data-limited fisheries benefit from using life-history traits as biological indicators of targeted stocks. We used histology-based reproductive analyses to estimate size at maturity, per capita egg production, and the number and biomass of immature individuals in the catch for three common coral ree...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Pensoft Publishers
2022-03-01
|
| Series: | Acta Ichthyologica et Piscatoria |
| Online Access: | https://aiep.pensoft.net/article/80586/download/pdf/ |
| _version_ | 1828420386818097152 |
|---|---|
| author | Ken Longenecker Erik C. Franklin Renee Hill-Lewenilovo Watisoni Lalavanua Ross Langston Sangeeta Mangubhai Susanna Piovano |
| author_facet | Ken Longenecker Erik C. Franklin Renee Hill-Lewenilovo Watisoni Lalavanua Ross Langston Sangeeta Mangubhai Susanna Piovano |
| author_sort | Ken Longenecker |
| collection | DOAJ |
| description | Data-limited fisheries benefit from using life-history traits as biological indicators of targeted stocks. We used histology-based reproductive analyses to estimate size at maturity, per capita egg production, and the number and biomass of immature individuals in the catch for three common coral reef fishes in Fiji market surveys during 2010–2019. We studied Lutjanus gibbus (Forsskål, 1775), Parupeneus indicus (Shaw, 1803), and Chlorurus microrhinos (Bleeker, 1854), which represent three families: Lutjanidae, Mullidae, and Scaridae, respectively. Fork length comprising 50% mature individuals for females of L. gibbus was 22.7 cm, that of P. indicus was 25.9 cm, attaining 38.0 cm for C. microrhinos. Females were rare or absent in the largest size classes of all three species. Immature fish represented up to 50% by number and 41% by biomass of the catch in market surveys, with P. indicus having the greatest immature number (8%‒50%) and biomass (6%‒41%), followed by C. microrhinos (20%‒30% by count, 11%‒18% by biomass) and L. gibbus (9%‒28% by count, 5%‒14% by biomass). Individuals ≤ 30 cm for L. gibbus and P. indicus and ≤ 45 cm for C. microrhinos were responsible for ≥ 90% of egg production per spawning. Skewed size-specific sex ratios suggested that exploitation of the largest size classes had minimal effect on overall egg production. Decreased catches of immature fishes would increase the reproductive population sizes for these species. |
| first_indexed | 2024-12-10T15:11:20Z |
| format | Article |
| id | doaj.art-7240efa55ab24cc1b3ac56e0a9e61d5c |
| institution | Directory Open Access Journal |
| issn | 1734-1515 |
| language | English |
| last_indexed | 2024-12-10T15:11:20Z |
| publishDate | 2022-03-01 |
| publisher | Pensoft Publishers |
| record_format | Article |
| series | Acta Ichthyologica et Piscatoria |
| spelling | doaj.art-7240efa55ab24cc1b3ac56e0a9e61d5c2022-12-22T01:43:56ZengPensoft PublishersActa Ichthyologica et Piscatoria1734-15152022-03-01521536510.3897/aiep.52.8058680586Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery managementKen Longenecker0Erik C. Franklin1Renee Hill-Lewenilovo2Watisoni Lalavanua3Ross Langston4Sangeeta Mangubhai5Susanna Piovano6Bishop MuseumUniversity of Hawaii at ManoaUniversity of the South PacificPacific CommunityWindward Community CollegeTalanoa ConsultingUniversity of the South PacificData-limited fisheries benefit from using life-history traits as biological indicators of targeted stocks. We used histology-based reproductive analyses to estimate size at maturity, per capita egg production, and the number and biomass of immature individuals in the catch for three common coral reef fishes in Fiji market surveys during 2010–2019. We studied Lutjanus gibbus (Forsskål, 1775), Parupeneus indicus (Shaw, 1803), and Chlorurus microrhinos (Bleeker, 1854), which represent three families: Lutjanidae, Mullidae, and Scaridae, respectively. Fork length comprising 50% mature individuals for females of L. gibbus was 22.7 cm, that of P. indicus was 25.9 cm, attaining 38.0 cm for C. microrhinos. Females were rare or absent in the largest size classes of all three species. Immature fish represented up to 50% by number and 41% by biomass of the catch in market surveys, with P. indicus having the greatest immature number (8%‒50%) and biomass (6%‒41%), followed by C. microrhinos (20%‒30% by count, 11%‒18% by biomass) and L. gibbus (9%‒28% by count, 5%‒14% by biomass). Individuals ≤ 30 cm for L. gibbus and P. indicus and ≤ 45 cm for C. microrhinos were responsible for ≥ 90% of egg production per spawning. Skewed size-specific sex ratios suggested that exploitation of the largest size classes had minimal effect on overall egg production. Decreased catches of immature fishes would increase the reproductive population sizes for these species.https://aiep.pensoft.net/article/80586/download/pdf/ |
| spellingShingle | Ken Longenecker Erik C. Franklin Renee Hill-Lewenilovo Watisoni Lalavanua Ross Langston Sangeeta Mangubhai Susanna Piovano Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management Acta Ichthyologica et Piscatoria |
| title | Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management |
| title_full | Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management |
| title_fullStr | Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management |
| title_full_unstemmed | Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management |
| title_short | Many immature individuals and largest size classes lacked females for three coral reef fishes (Actinopterygii) in Fiji market surveys: Implications for fishery management |
| title_sort | many immature individuals and largest size classes lacked females for three coral reef fishes actinopterygii in fiji market surveys implications for fishery management |
| url | https://aiep.pensoft.net/article/80586/download/pdf/ |
| work_keys_str_mv | AT kenlongenecker manyimmatureindividualsandlargestsizeclasseslackedfemalesforthreecoralreeffishesactinopterygiiinfijimarketsurveysimplicationsforfisherymanagement AT erikcfranklin manyimmatureindividualsandlargestsizeclasseslackedfemalesforthreecoralreeffishesactinopterygiiinfijimarketsurveysimplicationsforfisherymanagement AT reneehilllewenilovo manyimmatureindividualsandlargestsizeclasseslackedfemalesforthreecoralreeffishesactinopterygiiinfijimarketsurveysimplicationsforfisherymanagement AT watisonilalavanua manyimmatureindividualsandlargestsizeclasseslackedfemalesforthreecoralreeffishesactinopterygiiinfijimarketsurveysimplicationsforfisherymanagement AT rosslangston manyimmatureindividualsandlargestsizeclasseslackedfemalesforthreecoralreeffishesactinopterygiiinfijimarketsurveysimplicationsforfisherymanagement AT sangeetamangubhai manyimmatureindividualsandlargestsizeclasseslackedfemalesforthreecoralreeffishesactinopterygiiinfijimarketsurveysimplicationsforfisherymanagement AT susannapiovano manyimmatureindividualsandlargestsizeclasseslackedfemalesforthreecoralreeffishesactinopterygiiinfijimarketsurveysimplicationsforfisherymanagement |