Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific region

Ashley J. Williams, Corey B. Wakefield, Stephen J. Newman, Elodie Vourey, Francisco J. Abascal, Tuikolongahau Halafihi, Jeremie Kaltavara, Simon J. Nicol

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Deepwater tropical fisheries provide an important source of income and protein to Pacific and Indian Ocean coastal communities who are highly dependent on fish for food security. The development of quantitative assessments and management strategies for these deepwater fisheries has been hindered by insufficient biological and fisheries data. We examine the age-specific demography of the pygmy ruby snapper Etelis carbunculus, an important target species in tropical deepwater fisheries, across 90° of longitude and 20° of latitude in the Pacific and Indian Oceans. Our results show that growth of E. carbunculus varies significantly between oceans and sexes and across latitudes in both oceans. Estimates of natural and fishing mortality were similar between oceans, but higher for females than males in both oceans. Evidence of greater fishing pressure on females than males is likely due to the larger size-at-age of females compared to males, assuming that selectivity of the fishing gear is related directly to fish size. Sex ratios were significantly female biased in both oceans despite this species being gonochoristic, and maturity schedules were similar between sexes in the Pacific Ocean. This species exhibits a protracted spawning season from mid-spring to autumn (i.e., October to May) in the Pacific Ocean. These results represent the first estimates of age-specific demographic parameters for E. carbunculus, and provide the foundation for the development of the first species-specific assessment models and harvest strategies for the species. Future stock assessment models for E. carbunculus should consider sex-specific demographic parameters and spatial variation in demography. Our results reveal substantial differences in biology between E. carbunculus and the giant ruby snapper E. sp., a cryptic congeneric species, and thus contribute to greater clarity in managing fisheries that are dependent on these two species. Furthermore, the improved information on the life history of E. carbunculus contributes to the broader sustainable management and improved food security for deepwater snapper fisheries in the Indo-Pacific region.

Original languageEnglish
Article number382
Pages (from-to)1-15
Number of pages15
JournalFrontiers in Marine Science
Volume4
DOIs
Publication statusPublished - 18 Dec 2017
Externally publishedYes

Fingerprint

snapper
Fisheries
demography
fisheries
Pacific Ocean
oceans
fishery
gender
ocean
Ruby
ruby
Indian Ocean
food security
Fish
demographic statistics
longitude
fish
fishing gear
fishing mortality
stock assessment

Cite this

Williams, A. J., Wakefield, C. B., Newman, S. J., Vourey, E., Abascal, F. J., Halafihi, T., ... Nicol, S. J. (2017). Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific region. Frontiers in Marine Science, 4, 1-15. [382]. https://doi.org/10.3389/fmars.2017.00382
Williams, Ashley J. ; Wakefield, Corey B. ; Newman, Stephen J. ; Vourey, Elodie ; Abascal, Francisco J. ; Halafihi, Tuikolongahau ; Kaltavara, Jeremie ; Nicol, Simon J. / Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific region. In: Frontiers in Marine Science. 2017 ; Vol. 4. pp. 1-15.
@article{595f11de826443cc8ab491c2435b3f13,
title = "Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific region",
abstract = "Deepwater tropical fisheries provide an important source of income and protein to Pacific and Indian Ocean coastal communities who are highly dependent on fish for food security. The development of quantitative assessments and management strategies for these deepwater fisheries has been hindered by insufficient biological and fisheries data. We examine the age-specific demography of the pygmy ruby snapper Etelis carbunculus, an important target species in tropical deepwater fisheries, across 90° of longitude and 20° of latitude in the Pacific and Indian Oceans. Our results show that growth of E. carbunculus varies significantly between oceans and sexes and across latitudes in both oceans. Estimates of natural and fishing mortality were similar between oceans, but higher for females than males in both oceans. Evidence of greater fishing pressure on females than males is likely due to the larger size-at-age of females compared to males, assuming that selectivity of the fishing gear is related directly to fish size. Sex ratios were significantly female biased in both oceans despite this species being gonochoristic, and maturity schedules were similar between sexes in the Pacific Ocean. This species exhibits a protracted spawning season from mid-spring to autumn (i.e., October to May) in the Pacific Ocean. These results represent the first estimates of age-specific demographic parameters for E. carbunculus, and provide the foundation for the development of the first species-specific assessment models and harvest strategies for the species. Future stock assessment models for E. carbunculus should consider sex-specific demographic parameters and spatial variation in demography. Our results reveal substantial differences in biology between E. carbunculus and the giant ruby snapper E. sp., a cryptic congeneric species, and thus contribute to greater clarity in managing fisheries that are dependent on these two species. Furthermore, the improved information on the life history of E. carbunculus contributes to the broader sustainable management and improved food security for deepwater snapper fisheries in the Indo-Pacific region.",
keywords = "Data poor fisheries, Deepwater fisheries, Etelis carbunculus, Growth, Maturity, Mortality",
author = "Williams, {Ashley J.} and Wakefield, {Corey B.} and Newman, {Stephen J.} and Elodie Vourey and Abascal, {Francisco J.} and Tuikolongahau Halafihi and Jeremie Kaltavara and Nicol, {Simon J.}",
year = "2017",
month = "12",
day = "18",
doi = "10.3389/fmars.2017.00382",
language = "English",
volume = "4",
pages = "1--15",
journal = "Frontiers in Marine Science",
issn = "2296-7745",
publisher = "Frontiers Media S.A.",

}

Williams, AJ, Wakefield, CB, Newman, SJ, Vourey, E, Abascal, FJ, Halafihi, T, Kaltavara, J & Nicol, SJ 2017, 'Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific region', Frontiers in Marine Science, vol. 4, 382, pp. 1-15. https://doi.org/10.3389/fmars.2017.00382

Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific region. / Williams, Ashley J.; Wakefield, Corey B.; Newman, Stephen J.; Vourey, Elodie; Abascal, Francisco J.; Halafihi, Tuikolongahau; Kaltavara, Jeremie; Nicol, Simon J.

In: Frontiers in Marine Science, Vol. 4, 382, 18.12.2017, p. 1-15.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Oceanic, latitudinal, and sex-specific variation in demography of a tropical deepwater snapper across the indo-pacific region

AU - Williams, Ashley J.

AU - Wakefield, Corey B.

AU - Newman, Stephen J.

AU - Vourey, Elodie

AU - Abascal, Francisco J.

AU - Halafihi, Tuikolongahau

AU - Kaltavara, Jeremie

AU - Nicol, Simon J.

PY - 2017/12/18

Y1 - 2017/12/18

N2 - Deepwater tropical fisheries provide an important source of income and protein to Pacific and Indian Ocean coastal communities who are highly dependent on fish for food security. The development of quantitative assessments and management strategies for these deepwater fisheries has been hindered by insufficient biological and fisheries data. We examine the age-specific demography of the pygmy ruby snapper Etelis carbunculus, an important target species in tropical deepwater fisheries, across 90° of longitude and 20° of latitude in the Pacific and Indian Oceans. Our results show that growth of E. carbunculus varies significantly between oceans and sexes and across latitudes in both oceans. Estimates of natural and fishing mortality were similar between oceans, but higher for females than males in both oceans. Evidence of greater fishing pressure on females than males is likely due to the larger size-at-age of females compared to males, assuming that selectivity of the fishing gear is related directly to fish size. Sex ratios were significantly female biased in both oceans despite this species being gonochoristic, and maturity schedules were similar between sexes in the Pacific Ocean. This species exhibits a protracted spawning season from mid-spring to autumn (i.e., October to May) in the Pacific Ocean. These results represent the first estimates of age-specific demographic parameters for E. carbunculus, and provide the foundation for the development of the first species-specific assessment models and harvest strategies for the species. Future stock assessment models for E. carbunculus should consider sex-specific demographic parameters and spatial variation in demography. Our results reveal substantial differences in biology between E. carbunculus and the giant ruby snapper E. sp., a cryptic congeneric species, and thus contribute to greater clarity in managing fisheries that are dependent on these two species. Furthermore, the improved information on the life history of E. carbunculus contributes to the broader sustainable management and improved food security for deepwater snapper fisheries in the Indo-Pacific region.

AB - Deepwater tropical fisheries provide an important source of income and protein to Pacific and Indian Ocean coastal communities who are highly dependent on fish for food security. The development of quantitative assessments and management strategies for these deepwater fisheries has been hindered by insufficient biological and fisheries data. We examine the age-specific demography of the pygmy ruby snapper Etelis carbunculus, an important target species in tropical deepwater fisheries, across 90° of longitude and 20° of latitude in the Pacific and Indian Oceans. Our results show that growth of E. carbunculus varies significantly between oceans and sexes and across latitudes in both oceans. Estimates of natural and fishing mortality were similar between oceans, but higher for females than males in both oceans. Evidence of greater fishing pressure on females than males is likely due to the larger size-at-age of females compared to males, assuming that selectivity of the fishing gear is related directly to fish size. Sex ratios were significantly female biased in both oceans despite this species being gonochoristic, and maturity schedules were similar between sexes in the Pacific Ocean. This species exhibits a protracted spawning season from mid-spring to autumn (i.e., October to May) in the Pacific Ocean. These results represent the first estimates of age-specific demographic parameters for E. carbunculus, and provide the foundation for the development of the first species-specific assessment models and harvest strategies for the species. Future stock assessment models for E. carbunculus should consider sex-specific demographic parameters and spatial variation in demography. Our results reveal substantial differences in biology between E. carbunculus and the giant ruby snapper E. sp., a cryptic congeneric species, and thus contribute to greater clarity in managing fisheries that are dependent on these two species. Furthermore, the improved information on the life history of E. carbunculus contributes to the broader sustainable management and improved food security for deepwater snapper fisheries in the Indo-Pacific region.

KW - Data poor fisheries

KW - Deepwater fisheries

KW - Etelis carbunculus

KW - Growth

KW - Maturity

KW - Mortality

UR - http://www.scopus.com/inward/record.url?scp=85038237863&partnerID=8YFLogxK

U2 - 10.3389/fmars.2017.00382

DO - 10.3389/fmars.2017.00382

M3 - Article

VL - 4

SP - 1

EP - 15

JO - Frontiers in Marine Science

JF - Frontiers in Marine Science

SN - 2296-7745

M1 - 382

ER -