Life history of spiny dogfish, Squalus acanthias (L. 1758), in the southern Black Sea

Demirhan, Sefa Ayhan; Seyhan, Kadir

doi:10.1016/j.fishres.2007.02.009

Cited by 29 publications

(35 citation statements)

References 21 publications

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“…Compared to other sharks, S. acanthias reportedly has an exceptionally adaptive or “opportunistic” foraging behaviour, a conclusion supported by substantial spatial and temporal variations in diet [24], [46], [53], [54]. Whilst adaptive foraging could potentially mask diet changes with ontogeny, we found smaller sharks eating notably more small crustaceans and salps, and larger sharks more large and scavenged fishes.…”

Section: Discussionsupporting

confidence: 52%

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

et al. 2013

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Squaliforme sharks are a common but relatively vulnerable bycatch in many deep water fisheries. Eleven species of squaliforme shark are commonly caught at depths of 200–1200 m on Chatham Rise, New Zealand, and their diversity suggests they might occupy different niches. The diets of 133 Deania calcea and 295 Squalus acanthias were determined from examination of stomach contents. The diet of D. calcea was characterised by mesopelagic fishes, and S. acanthias by benthic to pelagic fishes, but was more adaptive and included likely scavenging. Multivariate analyses found the most important predictors of diet variability in S. acanthias were year, bottom temperature, longitude, and fish weight. The diet of the nine other commonly caught squaliforme sharks was reviewed, and the spatial and depth distribution of all species on Chatham Rise described from research bottom trawl survey catches. The eleven species had a variety of different diets, and depth and location preferences, consistent with niche separation to reduce interspecific competition. Four trophic groups were identified, characterised by: mesopelagic fishes and invertebrates (Centroselachus crepidater, D. calcea, and Etmopterus lucifer); mesopelagic and benthopelagic fishes and invertebrates (Centroscymnus owstoni, Etmopterus baxteri); demersal and benthic fishes (Centrophorus squamosus, Dalatias licha, Proscymnodon plunketi); and a generalist diet of fishes and invertebrates (S. acanthias). The trophic levels of the species in each of the four groups were estimated as 4.18–4.24, 4.20–4.23, 4.24–4.48, and 3.84 respectively. The diet of Oxynotus bruniensis and Squalus griffini are unknown. The different niches occupied by different species are likely to influence their vulnerability to bottom trawl fisheries. Some species may benefit from fisheries through an increased availability of scavenged prey.

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Section: Discussionsupporting

confidence: 52%

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

et al. 2013

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“…This divergence in the sex ratio has been recorded for several Squalus species (Demirhan and Seyhan, 2007) and has been particularly evident in all studies of S. megalops (Watson and Smale, 1998;Graham, 2005;Braccini et al, 2006a;Hazin et al, 2006). However, this predominance is not related to the embryos produced, which do not show differences in their proportions in any area investigated (Graham, 2005;Braccini et al, 2006a;Hazin et al, 2006).…”

Section: Discussionmentioning

confidence: 57%

Population biology of the shark, Squalus megalops, harvested in the central-east Atlantic Ocean

2011

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“…Follicular maturation and gestation occur simultaneously in this species, once females reach sexual maturity [93]. Although females were not assessed for reproductive status in the current study, all females were mature and assumed gravid [38].…”

Section: Discussionmentioning

confidence: 99%

The Use of Satellite Tags to Redefine Movement Patterns of Spiny Dogfish (Squalus acanthias) along the U.S. East Coast: Implications for Fisheries Management

et al. 2014

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Spiny dogfish (Squalus acanthias) are assumed to be a highly migratory species, making habitual north-south migrations throughout their northwestern Atlantic United States (U.S.) range. Also assumed to be a benthic species, spiny dogfish stock structure is estimated through Northeast Fisheries Science Center (NEFSC) bottom-trawl surveys. Recent anomalies in population trends, including a recent four-fold increase in estimated spawning stock biomass, suggest alternative movement patterns could exist for this shark species. To obtain a better understanding of the horizontal and vertical movement dynamics of this species, Microwave Telemetry pop-up satellite archival X-Tags were attached to forty adult spiny dogfish at the northern (Gulf of Maine) and southern (North Carolina) extents of their core U.S. geographic range. Reconstructed geolocation tracks ranging in lengths from two to 12 months suggest that the seasonal migration patterns appear to be local in nature to each respective northern and southern deployment site, differing from previously published migration paradigms. Differences in distance and direction traveled between seasonal geolocations possibly indicate separate migratory patterns between groups. Kernel utilization distribution models also suggest strong separate core home ranges. Significant differences in seasonal temperature and depths between the two regions further substantiate the possibility of separate regional movement patterns between the two groups. Vertical utilization also suggests distinct diel patterns and that this species may not utilize the benthos as previously thought, potentially decreasing availability to benthic gear.

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Life history of spiny dogfish, Squalus acanthias (L. 1758), in the southern Black Sea

Cited by 29 publications

References 21 publications

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

Population biology of the shark, Squalus megalops, harvested in the central-east Atlantic Ocean

The Use of Satellite Tags to Redefine Movement Patterns of Spiny Dogfish (Squalus acanthias) along the U.S. East Coast: Implications for Fisheries Management

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