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len f M This paper presents data on the age, growth, maturity, and distribution of Helicolenus d. dactylopterus (Delaroche 1809) from the Rockall Trough area. The results are based on a series of deep-water trawl surveys carried out on the continental slope west of Ireland and Scotland between 1992...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.7529 http://icesjms.oxfordjournals.org/content/56/1/61.full.pdf |
| Summary: | len f M This paper presents data on the age, growth, maturity, and distribution of Helicolenus d. dactylopterus (Delaroche 1809) from the Rockall Trough area. The results are based on a series of deep-water trawl surveys carried out on the continental slope west of Ireland and Scotland between 1992 and 1993. Ages ranged from 1 to 43 years for males and 1 to 37 years for females with most fish aged between 3–14 years. The species was found to be sexually dimorphic with males attaining a greater length and weight (L£=37.2 cm; W£=747 g) than females (L£=31.0 cm; W£=700 g). Age and growth estimates were determined for both sexes and the Brody growth coeYcient for both sexes indicate that this species is relatively slow growing (male K=0.06; female K=0.09). Ripe female fish were only found in April and May in a specific area. Using total lengths 50 % of male fish were mature at 26 cm (ages 15–16) while 50 % of female fish were mature at 23 cm (age 13). Catch data were sporadic but the largest catches were obtained on the southern slope of the Rockall Trough in April at a depth of 650–950 m. The fish from this area had a much greater range of sizes than fish from the eastern slopes of the Rockall Trough. |
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