Kingdom: Animalia Phylum: Chordata
spinarolo 2. Biological data The spiny dogfish (Squalus acanthias, figure 1) is a small, temperate-water, migratory shark of shelf seas in the northern and southern hemispheres. Although naturally abundant, it is one of the more vulnerable species of shark to over-exploitation by fisheries because o...
| Main Authors: | , , , , |
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.8793 http://www.cms.int/bodies/COP/cop9/Proposals/Eng/II_11_Squalus_acanthias_EC_E.pdf |
| Summary: | spinarolo 2. Biological data The spiny dogfish (Squalus acanthias, figure 1) is a small, temperate-water, migratory shark of shelf seas in the northern and southern hemispheres. Although naturally abundant, it is one of the more vulnerable species of shark to over-exploitation by fisheries because of its late maturity, low reproductive capacity, longevity, long generation time (25–40 years) and hence a very low intrinsic rate of population increase (2–7 % per annum). These life history parameters (Table 1) result in a limited reproductive capacity and one of the lowest population growth rates calculated for any shark species. Smith et al. (1998) considered this species to have the lowest intrinsic rebound potential of 26 shark species analysed, at 2.3 % annual rate of population increase from maximum sustainable yield (MSY) in the Northeast Pacific, compared with 4–7 % in the Northeast Atlantic (Heessen 2003). Annual mortality is estimated as 0.092 in the Northwest |
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