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Bengil, Fethi; Bengil, Elizabeth G. T.; Mavruk, Sinan; Heral, Oğulcan; Karaman, Ozan D.; Özaydın, Okan

doi:10.4194/1303-2712-v19_6_03

Cited by 15 publications

(9 citation statements)

References 18 publications

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“…The diet of E . spinax in Icelandic waters consists largely of teleost, crustaceans, and cephalopods, which is comparable to feeding habits observed in other areas [ 12 , 45 ], although the specifics vary from region to region [ 46 – 48 ]. As the diet of E. spinax was only a small component of this study, future research should aim to look into the specific feeding habits of the species in Icelandic waters.…”

Section: Discussionmentioning

confidence: 56%

Environmental preferences and critical habitat for the velvet belly lanternshark (Etmopterus spinax) in Icelandic waters

Mattína,

Campana,

Jakobsdóttir

2024

PLoS ONE

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The velvet belly lanternshark (Etmopterus spinax) is a small, bioluminescent shark that is caught as bycatch in many deep-sea fisheries in the Atlantic Ocean. Using data from 10,597 seasonal research survey tows spanning 11 years, the distribution, relative abundance, life history, and environmental preferences of E. spinax in Icelandic waters was examined for the first time. E. spinax (n = 8774) were only captured in relatively deep offshore waters to the south and west of Iceland. Females grew to larger sizes than males and reached 50% sexual maturity at a total length of 50 cm. Females at a late stage of maturity and very small juveniles (<20 cm) were restricted to the central south Icelandic shelf, suggesting that this might be critical habitat for the reproduction of the species. Most of the sharks were captured at depths of 400–500 m, a relatively narrow depth range, and classified as a stenothermic warm-water species with habitat temperature restricted to about 6.3–8.0°C. Teleosts, crustaceans and cephalopods made up most of the diet. There was no indication of a decline in abundance over the time span of the survey. However, climate-induced warming of the deep ocean may shift the distribution of the species to more northerly waters within Iceland.

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Section: Discussionmentioning

confidence: 56%

Environmental preferences and critical habitat for the velvet belly lanternshark (Etmopterus spinax) in Icelandic waters

Mattína,

Campana,

Jakobsdóttir

2024

PLoS ONE

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“…Predation on this species by black anglerfish was attributed to the nocturnal behaviour of S. oweniana; the white anglerfish (L. piscatorius) did not take S. oweniana, possibly due to it being more active during daylight hours (López et al, 2016). While some elasmobranchs in the East Mediterranean such as small spotted catshark preyed on S. oweniana, others such as longnose spurdog (Squalus blainville), velvet belly lanternshark (Etmopterus spinax) and blackmouth catshark (Galeus melastomus) did not eat this species (Bengil et al, 2019), despite the fact that S. oweniana was taken as prey in other parts of these predators' ranges (Jereb et al, 2015). Seals, dolphins and porpoises also appear to be important predators of this species (Jereb et al, 2015;Dede et al, 2016).…”

Section: Ecologymentioning

confidence: 99%

A review of recent studies on the life history and ecology of European cephalopods with emphasis on species with the greatest commercial fishery and culture potential

et al. 2021

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With the depletion of many commercial fish stocks and an increasing demand for marine protein for human consumption, cephalopods have become more important as a fishery resource. In EU waters, cephalopod stocks are not routinely assessed and exploitation of these species by large-scale fisheries is largely unregulated. For sustainable exploitation, adequate assessment and scientifically-supported management strategies are needed. However, there is still a lack of data on stock status and inadequate knowledge of the life history and ecology of these species. The present review examined more than 200 scientific articles, on life history and ecology of European cephalopods, published since 2013. It describes recent contributions to knowledge in the context of previously identified research priorities, along with recent advances towards sustainable fishing and aquaculture. It also identifies outstanding knowledge gaps. While some priority areas, such as the development of the species identification guides and evaluation of climate change impacts on cephalopods, have seen significant advances, other challenges remain for the future. These include monitoring of the life history traits and fishery status for the main commercially exploited species in the area, implementation of improved species identification methods during scientific surveys and fisheries monitoring, development of tools to identify stock units, and the study of the environmental and anthropogenic impacts on the stocks of cephalopods inhabiting European waters.

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“…E. spinax is known to segregate by sex and size (Mauchline and Gordon 1983;Massutí and Moranta 2003), the sexually dimorphic dentition may reflect further ecological niche establishment. Stomach content analysis show that E. spinax is an opportunistic feeder on a rather low trophic level (Bengil et al 2019). Its prey items comprise mainly teleosts, cephalopods and crustaceans (Fanelli et al 2009;Neiva et al 2006).…”

Section: Intraspecific Dental Variationmentioning

confidence: 99%

Intraspecific dental variations in the deep-sea shark Etmopterus spinax and their significance in the fossil record

Straube

Pollerspöck²

2020

Zoomorphology

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An important character on several taxonomic levels for shark identification is the tooth morphology. Sharks show a variety of highly specialized dentitions reflecting adaptations to their feeding habits. Intraspecific variation of tooth morphology such as sexual or ontogenetic dimorphism is poorly known in many species, even though tooth morphology plays a decisive role in the characterization of the fossil record of sharks, which comprises mostly fossil teeth. Here we analyzed the dentition of 40 jaws of the Velvet Belly Lantern Shark Etmopterus spinax and identified ontogenetic and sexual dimorphic characters such as total number of teeth, number of upper teeth, cusplet numbers in upper jaw teeth and width of lower jaw teeth. Dimorphic characters may reduce intraspecific competition for food, as E. spinax segregates by sex and size and may allow for identifying the male sex. The lower jaw tooth height, a sexually non-dimorphic character, was used to re-calculate the total length of specimens, which represents the first such approach for a squaliform shark. Results derived from the extant E. spinax are subsequently applied to fossil Etmopterus sp. teeth (Miocene) to gain individual information such as sex or size, but also characterize the extinct population from the excavation site by a size distribution profile in comparison to data from extant populations. This approach indicates the presence of multiple ontogenetic stages in the extinct population.

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Cited by 15 publications

References 18 publications

Environmental preferences and critical habitat for the velvet belly lanternshark (Etmopterus spinax) in Icelandic waters

Environmental preferences and critical habitat for the velvet belly lanternshark (Etmopterus spinax) in Icelandic waters

A review of recent studies on the life history and ecology of European cephalopods with emphasis on species with the greatest commercial fishery and culture potential

Intraspecific dental variations in the deep-sea shark Etmopterus spinax and their significance in the fossil record

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