First age and growth estimates in the deep water shark, Etmopterus Spinax (Linnaeus, 1758), by deep coned vertebral analysis

Gennari, Enrico; Scacco, Umberto

doi:10.1007/s00227-007-0769-y

Cited by 25 publications

(41 citation statements)

References 19 publications

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“…In the previous decades, studies on the biology of this species were carried out in the Mediterranean and North Eastern Atlantic Ocean. They focused on feeding habits and trophic interactions (Bello, 1997;Belluscio et al, 2000;Santos & Borges, 2001;Fanelli et al, 2009), reproduction (Vacchi & Relini Orsi, 1979;Capapè et al, 2001;Cecchi et al, 2004;Coelho & Erzini, 2008;Aranha et al, 2009;Coelho et al, 2010) and age and growth (Sion et al, 2004;Gennari & Scacco, 2007;Coelho & Erzini, 2008). However, information on its general biology in the Central Mediterranean is very limited and considering the highly vulnerable life cycle of this deepwater squalid shark, there is a need for population dynamics studies on this species (Coelho & Erzini, 2008) although, at the moment, it is classified in the IUCN red list as of Least Concern (LC) (Coelho et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Reproductive aspects of the velvet belly lantern shark Etmopterus spinax (Condrichthyes: Etmopteridae), from the central western Mediterranean sea. Notes on gametogenesis and oviducal gland microstructure.

Porcu

Marongiu²,

Follesa³

et al. 2013

Medit. Mar. Sci.

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In this paper, the reproductive biology of the velvet belly lanternshark Etmopterus spinax was analyzed in Sardinian waters (central western Mediterranean). This species was sexually dimorphic with females growing to a larger size than males. Marked sexual dimorphism in size was also observed along the vertical gradient. Histological analysis of gonads was very useful in assigning macroscopical maturity stages. The investigation on the microstructure of oviducal gland (OG) highlighted four morphofunctional zones with mucous and/or proteic secretions according to the zone and to their specific functions and development. Sperm in the OG was found for the first time in E. spinax. The localization of sperm storage tubules deeper in OG suggested long-term sperm storage, which is in agreement with the long reproductive cycle described. This species matured late, specifically at 80.7% and 79% at the maximum observed size for females and males respectively. Mature specimens were found throughout the year with pregnant females observed in winter and autumn. A low fecundity was observed with a mean ovarian fecundity of 16.5 mature follicles.

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Section: Introductionmentioning

confidence: 99%

Reproductive aspects of the velvet belly lantern shark Etmopterus spinax (Condrichthyes: Etmopteridae), from the central western Mediterranean sea. Notes on gametogenesis and oviducal gland microstructure.

Porcu

Marongiu²,

Follesa³

et al. 2013

Medit. Mar. Sci.

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“…Cleaning of the vertebral column section largely followed the method outlined in Gennari & Scacco (2007) until the vertebrae separated from each other and no remaining tissue was visible. Each cleaning cycle consisted of immersion in a sodium hypochlorite solution (10-15% active chlorine) for 15 minutes followed by a 15 minute rinse in distilled water.…”

Section: Vertebrae Extraction and Preparationmentioning

confidence: 99%

“…Staining of the vertebrae followed the method proposed by Gennari & Scacco (2007) with the following modifications:…”

Section: Staining and Reading Of Vertebraementioning

confidence: 99%

“…Owing to their deep water habitat, all of these species have been less well studied relative to many coastal elasmobranch species, especially A. aphyodes. Gennari & Scacco (2007) presented a new technique to age the velvet belly dogfish, Etmopterus spinax, using acid to etch the softer translucent band (Correia & Figueiredo, 1997) as well as utilizing a stain (cobalt(II) nitrate) to gain further definition and visibility. The ageing of deep-sea sharks presents a unique problem because: (1) they have been shown to have much less calcification of the vertebrae than shallow and coastal species (Cailliet, 1990) rendering many shark ageing techniques (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, very little is known about the age structure and growth patterns for the three shark species, both key parameters to understand the population biology of a species. Therefore, the aims of this study were twofold: (1) to provide fundamental information on the population biology (size structure, length/mass relationships and maturity ogives) of G. melastomus, C. crepidater and A. aphyodes; and (2) to apply the band enhancement ageing method described by Gennari & Scacco (2007) to try to determine the age structure and to derive growth curves for each study species. Cailliet et al, 1983;Cannizzaro et al, 1995;Wintner, 2000) unsuitable; and (2) the vertebra of deep-sea sharks exhibit a deep cone structure which limits the penetration of stains and cleaning agents (Correia & Figueiredo, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Population biology and ageing of the deep water sharks Galeus melastomus, Centroselachus crepidater and Apristurus aphyodes from the Rockall Trough, north-east Atlantic

2013

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This study presents new information on the population biology, growth and maturation schedules of Galeus melastomus, Centroselachus crepidater and Apristurus aphyodes sampled from the Rockall Trough, a region where deep sea fishing activity has been prevalent for the past 40 years and where shark by-catch is considerable. Both G. melastomus and C. crepidater showed significant sexual size dimorphism with females attaining a greater length and mass. The size (L 50 ) at first maturity was estimated to be 55.6 cm total length (TL) for males and 59.7 cm TL for females in G. melastomus, 57.2 cm TL for males and 75.4 cm TL for females in C. crepidater and 49.0 cm TL for males and 56.9 cm TL for females in A. aphyodes. This represents the first TL 50 analysis for Apristurus aphyodes globally. Sharks were aged using a technique which employed cobalt (II) nitrate to stain growth bands in vertebra centra. Band pairs were successfully viewed in G. melastomus and pair counts ranged from 0 to 5 in males and 2 to 7 in females. A higher asymptotic length was deduced from the von Bertalanffy growth equation for females than males (females: L 1 ¼ 69.3 cm; males: L 1 ¼ 60.8 cm) in G. melastomus. Staining was unsuccessful in C. crepidater and A. aphyodes and age could not be determined using this technique.

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Spatio-temporal density of the demersal Chondrichthyes assemblage in an upper bathyal of the eastern Mediterranean Sea

Deval,

Mutlu

2024

Mar. Biodivers.

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Chondrichthyans are a very important taxon that plays a role at the top of the trophic level of the food chain and are vulnerable species in the marine ecosystem. The deep waters of the eastern Mediterranean Sea have been less studied than the continental shelf, especially for the chondrichthyans.Therefore, the present study was conducted to investigate the spatio-temporal distribution of chondrichthyans collected monthly in different depth strata (200-900 m) during different periods (2010-2011 and 2019-2021) using an otter bottom trawl. A total of 17 species were identi ed, consisting composed of 6 batoids, 10 sharks and 1 chiemaers was identi ed. The constant species (dominance: DO%> 50) in the study area were Galeus melastomus, Scyliorhinus canicula, Etmopterus spinax and Raja clavata. The most abundant species was E. spinax, followed by G. melastomus. There were 14 species in the rst survey and 15 species in the second survey. Faunistic characteristics (number of species, abundance, diversity indices) varied only with bottom depth. Two different depthwise assemblages were estimated along the bottom depth gradient; ≤ 500 m and > 500 m. The discriminator species were R.clavata, S.canicula, G. melastomus, D. oxyrinchus and S. blainvillei found on the upper slope and E. spinax, G. melastomus and Centrophorus granulosus found on the lower slope. We estimated a total number of 26 species found in Antalya Bay, which was higher than the number reported in the previous studies.

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First age and growth estimates in the deep water shark, Etmopterus Spinax (Linnaeus, 1758), by deep coned vertebral analysis

Cited by 25 publications

References 19 publications

Reproductive aspects of the velvet belly lantern shark Etmopterus spinax (Condrichthyes: Etmopteridae), from the central western Mediterranean sea. Notes on gametogenesis and oviducal gland microstructure.

Reproductive aspects of the velvet belly lantern shark Etmopterus spinax (Condrichthyes: Etmopteridae), from the central western Mediterranean sea. Notes on gametogenesis and oviducal gland microstructure.

Population biology and ageing of the deep water sharks Galeus melastomus, Centroselachus crepidater and Apristurus aphyodes from the Rockall Trough, north-east Atlantic

Spatio-temporal density of the demersal Chondrichthyes assemblage in an upper bathyal of the eastern Mediterranean Sea

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