Age‐based life history of Pacific longnose parrotfish <i>Hipposcarus longiceps</i> from New Caledonia

Moore, Bradley R.

doi:10.1111/jfb.15004

Cited by 5 publications

(1 citation statement)

References 43 publications

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“…From these selections, the instantaneous rate of total mortality (Z) for M. caml and M. whitsoni was estimated using the generalized linear mixed model (GLMM) estimator of Millar (2015). For each species, random-intercept Poisson log-linear GLMMs were fitted separately for females and males, and both sexes combined, with the frequency of fish in each age class as the response variable, age as a fixed factor, and a random intercept, following the approach of Moore (2019;2022). Models were fitted to data for age classes equal to or greater than the modal age.…”

Section: Mortalitymentioning

confidence: 99%

Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica

Moore

Parker²,

Marriott³

et al. 2022

Front. Mar. Sci.

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The grenadiers Macrourus caml and M. whitsoni form a significant bycatch component of longline fisheries for Antarctic toothfish (Dissostichus mawsoni) in the Southern Ocean. A lack of species-level biological and catch data has to date hindered the development of quantitative assessments for these deepwater species. This paper examines species- and sex-specific life histories of M. caml and M. whitsoni in the Ross Sea region, Antarctica, from samples collected from the commercial fishery and research collections. Macrourus caml was found to live longer, grow slower, and attain a larger maximum length than M. whitsoni, reaching at least 65 years of age and 97 cm total length (TL) vs. 43 years and 78 cm TL for M. whitsoni. In addition, M. caml attains a larger length for a given age and a greater weight for a given length. For each species, females of a given age were larger and reached a greater maximum age than males. Assuming that selectivity of the fishing gear is related to fish size, greater fishing pressure on females than males is likely, and was evidenced by female-biased sex ratios of both species. Estimates of natural and fishing mortality rates were low for both species. Despite having a shorter lifespan and attaining a smaller maximum length, M. whitsoni matured later in life and at larger lengths than M. caml. Although sampling opportunities are constrained seasonally due to sea ice cover, gonad staging and interannual patterns in gonadosomatic indices suggest prolonged spawning for both species, with available data indicating peak spawning during austral summer. The differences in life history observed between these two closely related and morphologically similar species illustrates the importance of understanding species-specific life histories to infer responses to exploitation, provide key biological inputs to inform parameters for future risk assessments and ecosystem models as well as baseline information for comparative work over both time and space, contribute to greater clarity in managing fisheries that interact with these two species, and further our understanding of grenadier life history.

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Section: Mortalitymentioning

confidence: 99%

Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica

Moore

Parker²,

Marriott³

et al. 2022

Front. Mar. Sci.

Self Cite

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Database of Hermaphroditic Fish Species and References

Kuwamura

Sawada

Sunobe

et al. 2022

Hermaphroditism and Mating Systems in Fish

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Decadal changes in parrotfish assemblages around reefs of Guam, Micronesia

2022

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Modern coral reefs face substantial threats that endanger their capacity to function and provide resources for human populations. Chronic human pressure through exploitation and land-based pollution has led to reef degradation and lower productivity. More recently, this pressure is compounded with successive episodes of coral bleaching across the tropical oceans. However, response trajectories of reef resources to exploitation, habitat degradation, and local management may not be straightforward, as these ecosystems are incredibly complex. We employed a comprehensive and standardized survey of parrotfish assemblages within reef systems in Guam to examine trajectories of biomass and function across a decade of change. Parrotfishes represent one of the most commercially and ecologically important coastal resources throughout Micronesia. We found that parrotfish biomass declined by nearly 30% over the course of ten years, with concomitant decreases in grazing and bioerosion rates at a similar magnitude. There was evidence of fishery exploitation playing a role, but overall patterns were not always aligned with the hypothesis of fishery-induced decline. For example, two-thirds of marine-protected area sites declined in biomass and mean body length was stable for several highly targeted species. Further, most biomass decline stemmed from small species with higher resilience to fishery exploitation, whereby three of the most vulnerable fishery target species either maintained or increased total biomass. The ultimate drivers of parrotfish assemblage trajectories in Guam are likely a complex mixture of exploitation, habitat change from multiple stressors, and responses to management measures. However, the potential future decline in fishery production and ecological function is substantial and merits continuous monitoring and proactive management.

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Age‐based life history of Pacific longnose parrotfish Hipposcarus longiceps from New Caledonia

Cited by 5 publications

References 43 publications

Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica

Comparative biology of the grenadiers Macrourus caml and M. whitsoni in the Ross Sea region, Antarctica

Database of Hermaphroditic Fish Species and References

Decadal changes in parrotfish assemblages around reefs of Guam, Micronesia

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