Aspects of reproduction of the deep water sharks <i>Centroscymnus coelolepis</i> and <i>Centrophorus squamosus</i> from west of Ireland and Scotland

Clarke, Maurice; Connolly, P.; Bracken, J. J.

doi:10.1017/s0025315401005008

Cited by 61 publications

(73 citation statements)

References 14 publications

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“…This sexual dimorphism is very common among other squalid sharks (e.g. Clarke et al, 2001Clarke et al, , 2002Sion et al, 2003) and is already recorded for E. spinax in the Tyrrhenian Sea (Cecchi et al, 2004), Southern Portugal (Coelho & Erzini, 2005) and Azores (Aranha et al, 2009) and also for the congenus E. princeps (Jacobsodóttir, 2001).…”

Section: Discussionsupporting

confidence: 56%

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: Discussionsupporting

confidence: 56%

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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“…Only one pregnant female of this shark was found at 1500 m depth. In the northeast Atlantic, pregnant females were found almost exclusively in waters shallower than 1200 m (Girard and Du Buit, 1999;Clarke et al, 2001). This would explain the fact that pregnant females can move to shallower bottoms to give birth.…”

Section: Discussionmentioning

confidence: 98%

Chondrichthyes species in deep waters of the Mediterranean Sea

Sión¹,

Bozzano²,

D’Onghia³

et al. 2004

Sci. Mar.

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SUMMARY: Data collected during the DESEAS survey carried out in three areas of the Mediterranean Sea (Balearic Sea, western and eastern Ionian Sea) were used to describe the distribution and abundance of chondrichthyes species at depths between 600 and 4000 m. A total of 8 chondrichthyes species were recorded, 5 of them in the Balearic Sea, 4 in the western Ionian and 6 in the eastern Ionian. A decrease in abundance with depth was observed in each species with the exception of Centroscymnus coelolepis. The most abundant species were Galeus melastomus and Etmopterus spinax. The depth range of some species was updated. G. melastomus was caught down to 1500 m, exhibiting a smaller-deeper pattern in females, while E. spinax was captured down to 2200 m with a bigger-deeper trend. Mature females of these two sharks were found between 600 and 1500 m. A wide size-range was shown in both species. C. coelolepis was only collected in the Balearic Sea down to 2800 m. The presence of a pregnant female was sampled from a depth of 1500 m. The distribution of the species is discussed in the context of the present knowledge of the Mediterranean ichthyofauna.

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“…Biased sex ratios in dogshark catches are commonly reported and although segregation of the sexes by depth has been observed in several midslope dogsharks (e.g. Yano and Tanaka 1988;Yano 1995;Clarke et al 2001;Jakobsdóttir 2001), segregation by depth was unlikely for Centrophorus off NSW. Sampling during the 1976-77 survey encompassed most of the preferred depth range (300-650 m) of these species, and subsequent trawling in depths between 600 and 1000 m also caught predominantly males (Table 1).…”

Section: Population Structurementioning

confidence: 99%

“…Significant landings of Centrophorus squamosus and C. granulosus are reported from several areas of the northeast Atlantic Ocean (Girard and Du Buit 1999;Clarke et al 2001;Correia and Smith 2003) and, for C. granulosus, from the Mediterranean Sea (Guallart and Vicent 2001). While Centroscymnus spp.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies into the biology of deepwater squaloid sharks have mainly focussed on the essentially mid-slope species of Centroscyllium, Centroscymnus, Deania and Etmopterus from the North Atlantic Ocean (Yano 1995;Jakobsdóttir 2001;Clarke et al 2002), Japan (Yano andTanaka 1984, 1988) and New Zealand (Wetherbee 1996), while most studies into the biology of Centrophorus dealt with C. squamosus from the north-west Atlantic, for example Girard and Du Buit (1999), Girard et al (2000), Clarke et al (2001), Bañón et al (2008), Figueiredo et al (2008) and Severino et al (2009). Of the shallower upper-slope species, Bass et al (1976) gave brief details of size at maturity for 'C.…”

Section: Introductionmentioning

confidence: 99%

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Distribution, reproduction and population structure of three gulper sharks (Centrophorus, Centrophoridae) in south-east Australian waters

Graham

Daley

2011

Mar. Freshwater Res.

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Abstract. Gulper sharks (Centrophorus spp.) are commercially fished in all oceans but the taxonomy and biology of many species are not clearly defined, and stocks are extremely vulnerable to over-exploitation. We present distributional, size-frequency and reproductive data for three species (Centrophorus harrissoni, C. moluccensis and C. zeehaani) that fishing has largely extirpated from the south-east Australian upper continental slope. Trawl-survey catches in 1976-77 from lightly exploited stocks comprised mostly mature males with few mature females or juveniles; a 2009 long-line survey caught higher proportions of mature females and, for C. harrissoni, more juveniles. Females of the three species grew larger and reached maturity at a greater size than males and, for both sexes, maturity sizes were more than 80% of their maximum observed lengths. Reproduction was continuous but data were insufficient to determine seasonality. Ovarian and uterine fecundity were singular for C. zeehaani whereas C. harrissoni and C. moluccensis developed two oocytes and produced one or two embryos; evidence suggests that the left-side uterus is less functional than the right-side. In response to these species' inherent low productivity and continuing reduced numbers, managers have introduced landing restrictions and area closures to enhance Centrophorus stocks in southern Australian waters.

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Aspects of reproduction of the deep water sharks Centroscymnus coelolepis and Centrophorus squamosus from west of Ireland and Scotland

Cited by 61 publications

References 14 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.

Chondrichthyes species in deep waters of the Mediterranean Sea

Distribution, reproduction and population structure of three gulper sharks (Centrophorus, Centrophoridae) in south-east Australian waters

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