International workshop on developing strategies for monitoring data-limited deepwater demersal line fisheries in the Pacific Ocean

Williams, Ashley B.; Nicol, Simon; Bentley, Nokome; Starr, Paul J.; Newman, Stephen; McCoy, Michael; Kinch, Jeff; Williams, P.; Magron, F.; Pilling, Graham M.; Bertram, I.; Batty, M

doi:10.1007/s11160-011-9234-6

Cited by 23 publications

(15 citation statements)

References 6 publications

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“…Age-based biological studies of many deep-water demersal fishes, particularly those of primary fisheries importance, are either absent or very limited (see Newman and Dunk, 2003;Wakefield et al, 2010;Williams et al 2012b;Newman et al, 2015). Comparisons of such data across, the Indo-Pacific have not been undertaken to date, but would be informative considering the substantial variations in the types and amounts of exploitation and levels of management of fisheries between regions.…”

Section: Discussionmentioning

confidence: 99%

“…This is particularly relevant for species that exhibit pan-oceanic mixing (e.g., Sedberry et al, 1996;Ball et al, 2000), span significant latitudinal, longitudinal and temperature ranges (Wakefield, 2006;Williams et al, 2012a;Cappo et al, 2013;Carter et al, 2014), and/or exhibit spawning omission over a large part of their geographic range (Wakefield et al, 2013b). It is also important that such studies adopt standardised procedures (e.g., methods and interpretations of age estimation from otolith sections) in order to facilitate effective comparisons (see Williams et al, 2012b;Newman et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Variations in growth, longevity and natural mortality for the protogynous hermaphroditic eightbar grouper Hyporthodus octofasciatus between the Indian and Pacific Oceans

et al. 2015

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Variations in growth, longevity and natural mortality for the protogynous hermaphroditic eightbar grouper Hyporthodus octofasciatus between the Indian and Pacific Oceans

et al. 2015

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“…Fourth, fisheries that target Etelis spp. would benefit from phylogenetic resolution because cryptic species may be mismanaged if treated as a single stock (Williams et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The maximum body size attained by this species varies substantially between regions (Smith, 1992). In the southwest Pacific, E. carbunculus exceeds 110 cm fork length (FL) (Fry et al, 2006;Williams et al, 2012Williams et al, , 2015 whereas in the Commonwealth of the Northern Mariana Islands (CNMI), Hawai'i, and French Polynesia, the maximum size is typically <65 cm FL (Smith and Kostlan, 1991). These differences in maximum size indicate either geographically structured intraspecific variation in growth patterns, or the presence of different species in different regions.…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of deepwater snappers (Genus Etelis) reveals a cryptic species pair in the Indo-Pacific and Pleistocene invasion of the Atlantic

Andrews

Williams

Fernández-Silva

et al. 2016

Molecular Phylogenetics and Evolution

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Evolutionary genetic patterns in shallow coastal fishes are documented with dozens of studies, but corresponding surveys of deepwater fishes (>200m) are scarce. Here we investigate the evolutionary history of deepwater snappers (genus Etelis), comprised of three recognized Indo-Pacific species and one Atlantic congener, by constructing a phylogeny of the genus with two mtDNA loci and two nuclear introns. Further, we apply range-wide Indo-Pacific sampling to test for the presence and distribution of a putative cryptic species pair within E. carbunculus using morphological analyses and mtDNA cytochrome b sequences from 14 locations across the species range (N=1696). These analyses indicate that E. carbunculus is comprised of two distinct, non-interbreeding lineages separated by deep divergence (d=0.081 in cytochrome b). Although these species are morphologically similar, we identified qualitative differences in coloration of the upper-caudal fin tip and the shape of the opercular spine, as well as significant differences in adult body length, body depth, and head length. These two species have overlapping Indo-Pacific distributions, but one species is more widespread across the Indo-Pacific, whereas the other species is documented in the Indian Ocean and Western Central Pacific. The dated Etelis phylogeny places the cryptic species divergence in the Pliocene, indicating that the biogeographic barrier between the Indian and Pacific Oceans played a role in speciation. Based on historic taxonomy and nomenclature, the species more widespread in the Pacific Ocean is E. carbunculus, and the other species is previously undescribed (referred to here as E. sp.). The Atlantic congener E. oculatus has only recently (∼0.5Ma) diverged from E. coruscans in the Indo-Pacific, indicating colonization via southern Africa. The pattern of divergence at the Indo-Pacific barrier, and Pleistocene colonization from the Indian Ocean into the Atlantic, is concordant with patterns observed in shallow coastal fishes, indicating similar drivers of evolutionary processes.

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“…Given past observations of localised depletion in the Pacific Islands region, fishery managers are approaching such opportunities with caution. Quantitative assessments of the population dynamics of these species and the potential impact of fishing on their populations have been requested to support policies for their sustainable exploitation or conservation (Williams et al., ).…”

Section: Introductionmentioning

confidence: 99%

Population biology and vulnerability to fishing of deep-water Eteline snappers

et al. 2013

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Summary Deep‐water fish in the tropical and sub‐tropical Pacific Ocean have supported important fisheries for many generations. Observations of localised depletions in some fisheries have raised concerns about the sustainability of current fishing rates. However, quantitative assessments of deep‐water stocks in the Pacific region have been limited by the lack of adequate biological and fisheries data. Estimates are provided of age‐based demographic parameters for two important deep‐water snapper species in the Pacific, Etelis carbunculus and E. coruscans. A spawner biomass‐per‐recruit (SPR) model was applied to determine fishing mortality rates for each species that would achieve specified biological targets (40% unexploited levels, SPR40) and limit (30% unexploited levels, SPR30) reference points, and examine the sensitivity of the model to variation in natural mortality and age at first capture. The maximum observed age, based on increment counts from sectioned otoliths, was 21 years for E. carbunculus and 18 years for E. coruscans. Total mortality (Z), estimated from the Hoenig regression, was 0.21 year−1 for E. carbunculus and 0.25 year−1 for E. coruscans. The best approximating growth models were the von Bertalanffy model (L∞ = 896 mm fork length, k = 0.28, t0 = 0.51) for E. carbunculus and the logistic model (L∞ = 879 mm fork length, k = 0.32 year−1, t0 = 3.42) for E. coruscans. The spawner biomass‐per‐recruit analysis demonstrated that lower rates of fishing mortality were required for E. coruscans than for E. carbunculus to maintain spawning biomass above estimated biological reference points. Estimates of spawner biomass‐per‐recruit were more sensitive to variation in natural mortality than in the age at first capture, suggesting that regulating fishing mortality rather than gear selectivity would be a more effective management measure for both species. Maintaining fishing mortality <0.1 for both species is recommended as a cautious approach to management, given the uncertainty in estimates of natural mortality and mixed fishery considerations.

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International workshop on developing strategies for monitoring data-limited deepwater demersal line fisheries in the Pacific Ocean

Cited by 23 publications

References 6 publications

Variations in growth, longevity and natural mortality for the protogynous hermaphroditic eightbar grouper Hyporthodus octofasciatus between the Indian and Pacific Oceans

Variations in growth, longevity and natural mortality for the protogynous hermaphroditic eightbar grouper Hyporthodus octofasciatus between the Indian and Pacific Oceans

Phylogeny of deepwater snappers (Genus Etelis) reveals a cryptic species pair in the Indo-Pacific and Pleistocene invasion of the Atlantic

Population biology and vulnerability to fishing of deep-water Eteline snappers

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