Stomach contents and notes on the reproduction of the Onefin Skate Gurgesiella dorsalifera (Chondrichthyes: Rajidae) off Southern Brazil

Rincon, Getulio; Vaske, Teodoro; Vooren, Carolus Maria

doi:10.1590/s1679-62252008000400019

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…High CPUE values of rare benthic fishes are strong evidence of an aggregation behavior in specific areas in search of food or for reproductive purposes. The same apparent behavior was also observed in G. dorsalifera, a small deep-water skate with evidences of feeding aggregation based on high CPUE values and stomach contents [63][64][65]. Both species are reported on commercial captures by onboard observers, but frequently not considered as relevant on fisheries management programs.…”

Section: Brazilian Deep-water Elasmobranch Bycatchsupporting

confidence: 53%

“…Most of the specimens landed were adhered to the squids, but probably a larger proportion was discarded at sea immediately after capture. Its high endemism off southern Brazil is a matter of concern [65]. After considering the endemism and on growing fishery risk, it was listed as a vulnerable species by the IUCN Red List of Threatened Species [58,64,67,[95][96][97].…”

Section: Deep-water Raysmentioning

confidence: 99%

See 1 more Smart Citation

Deep-Water Sharks, Rays, and Chimaeras of Brazil

Rincon¹,

Mazzoleni²,

OnoderaPalmeira³

et al. 2017

Chondrichthyes - Multidisciplinary Approach

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The deep-water fishery in Brazil is currently in expansion due to depletion of most neritic economic species. This increasing deep-water effort brings concern on the bycatch impact, its specific composition, the need for capture's evaluation and development of bycatch reduction devices. The impact is particularly aggressive on deep-water elasmobranchs, which have an extreme ecological k-strategy due to their reproductive constraints (lower fecundity and late first maturity age). Scientific deepwater surveys and intensive research programs (REVIZEE) along the past decade indicate that Brazilian elasmobranch diversity is higher than previously imagined. However, the deep-water fishery threatens this poorly known community of sharks and rays on the Brazilian continental slope as they become bycatch of a fast-growing and uncontrolled fishery. The recent study case of the monkfish (Lophius gastrophysus) fishery dynamics, well presented and discussed by the Brazilian scientific community, provided evidence of the need of bycatch-specific monitoring programs and fast-response fishery regulations. The present work discusses the Brazilian deep-water elasmobranch bycatch problem under the light of its biological diversity and completely unknown population status. Suggestions and management considerations are presented in order to coordinate and manage the establishment and growth of this deep-water fishery in Brazil.

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Section: Brazilian Deep-water Elasmobranch Bycatchsupporting

confidence: 53%

Section: Deep-water Raysmentioning

confidence: 99%

Deep-Water Sharks, Rays, and Chimaeras of Brazil

Rincon¹,

Mazzoleni²,

OnoderaPalmeira³

et al. 2017

Chondrichthyes - Multidisciplinary Approach

Self Cite

View full text Add to dashboard Cite

show abstract

Biological data of the deep-water lizard catshark Schroederichthys saurisqualus (Chondrichthyes: Scyliorhinidae) in southern Brazil

Sêga

Mazzoleni

Rincon

et al. 2020

Regional Studies in Marine Science

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Phylogenetic analysis of viviparity, matrotrophy, and other reproductive patterns in chondrichthyan fishes

Blackburn,

Hughes

2024

Biological Reviews

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The reproductive diversity of extant cartilaginous fishes (class Chondrichthyes) is extraordinarily broad, reflecting more than 400 million years of evolutionary history. Among their many notable reproductive specialisations are viviparity (live‐bearing reproduction) and matrotrophy (maternal provision of nutrients during gestation). However, attempts to understand the evolution of these traits have yielded highly discrepant conclusions. Here, we compile and analyse the current knowledge on the evolution of reproductive diversity in Chondrichthyes with particular foci on the frequency, phylogenetic distribution, and directionality of evolutionary changes in their modes of reproduction. To characterise the evolutionary transformations, we amassed the largest empirical data set of reproductive parameters to date covering nearly 800 extant species and analysed it via a comprehensive molecular‐based phylogeny. Our phylogenetic reconstructions indicated that the ancestral pattern for Chondrichthyes is ‘short single oviparity’ (as found in extant holocephalans) in which females lay successive clutches (broods) of one or two eggs. Viviparity has originated at least 12 times, with 10 origins among sharks, one in batoids, and (based on published evidence) another potential origin in a fossil holocephalan. Substantial matrotrophy has evolved at least six times, including one origin of placentotrophy, three separate origins of oophagy (egg ingestion), and two origins of histotrophy (uptake of uterine secretions). In two clades, placentation was replaced by histotrophy. Unlike past reconstructions, our analysis reveals no evidence that viviparity has ever reverted to oviparity in this group. Both viviparity and matrotrophy have arisen by a variety of evolutionary sequences. In addition, the ancestral pattern of oviparity has given rise to three distinct egg‐laying patterns that increased clutch (brood) size and/or involved deposition of eggs at advanced stages of development. Geologically, the ancestral oviparous pattern arose in the Paleozoic. Most origins of viviparity and matrotrophy date to the Mesozoic, while a few that are represented at low taxonomic levels are of Cenozoic origin. Coupled with other recent work, this review points the way towards an emerging consensus on reproductive evolution in chondrichthyans while offering a basis for future functional and evolutionary analyses. This review also contributes to conservation efforts by highlighting taxa whose reproductive specialisations reflect distinctive evolutionary trajectories and that deserve special protection and further investigation.

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Stomach contents and notes on the reproduction of the Onefin Skate Gurgesiella dorsalifera (Chondrichthyes: Rajidae) off Southern Brazil

Cited by 3 publications

References 7 publications

Deep-Water Sharks, Rays, and Chimaeras of Brazil

Deep-Water Sharks, Rays, and Chimaeras of Brazil

Biological data of the deep-water lizard catshark Schroederichthys saurisqualus (Chondrichthyes: Scyliorhinidae) in southern Brazil

Phylogenetic analysis of viviparity, matrotrophy, and other reproductive patterns in chondrichthyan fishes

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