International workshop on methodological evolution to improve estimates of life history parameters and fisheries management of data-poor deep-water snappers and groupers

Newman, Stephen J.; Wakefield, Corey B.; Williams, Ashley J.; O’Malley, J. Michael; Nicol, Simon; DeMartini, Edward E.; Halafihi, Tuikolongahau; Kaltavara, Jeremie; Humphreys, Robert; Taylor, Brett M.; Andrews, Allen H.; Nichols, Ryan S.

doi:10.1016/j.marpol.2015.06.020

Cited by 27 publications

(15 citation statements)

References 15 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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“…E. carbunculus and E. sp. are important target species in many commercial, recreational, artisanal, and subsistence fisheries across the Indo-Pacific (Dalzell et al, 1996;Newman et al, 2015). However, catch estimates are uncertain for most fisheries because the social and spatial complexity of artisanal and subsistence fisheries results in poorly reported catch statistics.…”

Section: Fisheries Managementmentioning

confidence: 99%

“…First, Etelis is comprised of four recognized species, three with overlapping ranges across the Indo-Pacific, and one in the Atlantic. Second, Eteline snappers support recreational, artisanal, and commercial fisheries throughout their range (Williams et al, 2013;Newman et al, 2015), so that expensive expeditions are not necessary to obtain specimens. Third, there is some question about whether the widespread Etelis carbunculus Cuvier (Cuvier and Valenciennes, 1828) comprises one or two species (Wakefield et al, 2014;Williams et al, 2015).…”

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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“…The time required to train staff in this technique has been minimal (< 2 hours), based on a single session held at two separate for fish ageing workshops where participants successfully learnt on a range of predominantly lutjanid species (e.g. [4]). This method has also been used on a large size range of fish, i.e.…”

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confidence: 99%

Rapid Lateral Extraction of Otoliths that Maintains the Integrity of Fish Product to Improve Access to Catches and Reduce Potential Sampling Biases

Wakefield¹,

Boddington²,

Newman³

2016

TOFISHSJ

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Abstract:The capacity to sample otoliths of fish from commercial, recreational, artisanal or subsistence catches can be constrained if the dissection process results in alterations to their external appearance and thus reduces its value and/or shelf life. There can also be significant biases incorporated into the collection of otolith samples if access is only granted relative to the size of the fish (i.e. if smaller fish are sold whole). To reduce such limitations, we herein describe a rapid and simple method of lateral otolith extraction that maintains the integrity of the fish product, and thus reduces potential biases in sample collection for age structure data. Representative sampling is an important consideration for the collection of age structure data when it is intended to be used in fisheries stock assessments.Keywords: Age Data, Fisheries, Representative Sampling, Sagittal Otolith Removal.Sagittal otoliths of fish are currently regarded as the primary structure for obtaining reliable estimates of their age [1]. Deriving estimates of mortality from age structure data for an exploited population of fish is an integral part of determining their sustainable harvest through quantitative stock assessments. To improve the accuracy of stock assessment estimates it is vital that the collection of age structure data be representative of the temporal and spatial distribution of fishing catch and/or effort. Considering fish population monitoring studies are usually constrained by funding and resources, collections of otoliths rely on the assistance of fishers to allow scientists to perform fish dissections on their valued catches. Such access is often restricted due to the sampling process resulting in alterations to the fish's external appearance and/or exposing internal structures to the external environment, subsequently reducing their value and shelf life (e.g. [2]). In order to reduce bias in age structure data during sampling access to catches needs to be maximised. This can be achieved through a rapid technique of otolith extraction that maintains the appearance and quality of sampled fish, which would thus overcome many factors that may prevent access for dissections prior to sizebased grading (e.g. filleting of larger fish, selling of smaller fish whole), which reduces the potential for sampling bias.Sagittal otoliths are located within the otic capsule that forms the ventral, posterior portion of the cranium. The otic capsule is made up predominantly of the exoccipital, basioccipital and parasphenoid bones (Fig. 1b). Sagittal otoliths are most commonly extracted either 1) dorsally by opening the cranium using a sawing device, or 2) ventrally by removing the gills to expose the otic capsule which can be levered opened using bone cutters or scissors ( Fig. 1), [3]. However, both these extraction methods require significant alterations to the physical appearance of the fish, which can reduce the value of the fish and subsequently limit access to catches for scientific dissections. The lateral extraction o...

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International workshop on methodological evolution to improve estimates of life history parameters and fisheries management of data-poor deep-water snappers and groupers

Cited by 27 publications

References 15 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

Rapid Lateral Extraction of Otoliths that Maintains the Integrity of Fish Product to Improve Access to Catches and Reduce Potential Sampling Biases

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