Browsing by Author "Krug, H."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Age and growth in the Alfonsino, Beryx splendens (Berycidae) from the Azores (central eastern Atlantic)Publication . Aníbal, J.; Esteves, Eduardo; Krug, H.; Silva, H. M. daAge was determined in the Alfonsino, Beryx splendens, by counting the opaque rings on the anti‐sulcal surface of left sagittae obtained from specimens, 15–43.5 cm fork length (FL), caught off the Azores. Females were from 1 to 12 years old and males were 1 to 9 years old. Von Bertalanffy (VB) growth equations were fitted to data obtained from age‐length keys, back calculation, and length‐frequency analyses. Growth was compared between sexes and among methods. Growth was similar in males, whereas in females the equations derived from length‐frequency analysis overestimated length‐at‐age relative to other methods. Sex specific growth could not be confirmed.
- Age and growth of the alfonsino, Beryx splendens, from the Azores (Berycidae)Publication . Aníbal, J.; Esteves, E.; Krug, H.; Silva, H. M. daThe Alfonsino, Beryx splendens Lowe, 1834, is a demersal fish species that inhabits the continental slope (200-600 m depth) in the eastern Atlantic (Quero, 1984) and seamounts around the islands of Madeira, the Canaries and the Azores (Maul, 1986). This species can also be found in the western Atlantic, Pacific and Indian Oceans (Bushakin, 1982 in Kotlyar, 1987). It is a bycatch of the Pagellus bogaraveo artisanal fishery in the Azores. The landings increased from 3 metric tons in 1980 (< 1% of the fishery landings) to 635 metric tons in 1994 (> 67%) (Lotaçor, 1980-1995). Available information on age and growth of Alfonsino from the Atlantic has come from fisheries sources and consists mainly of length-frequency, catch curves, age frequencies and length-at-age curves (Leon & Malkov, 1979; Kotlyar, 1987; ICES, unpublished report; Assessment Committee, 1995-1996; Gauldie, 1995). The objectives of this study were to determine the age from sagittae otoliths and to conduct a preliminarily growth study of the Alfonsino from the Azores.
- European contribution to the study of age and growth of bluemouth Helicolenus dactylopterus dactylopterus from the Azores (Scorpaenidae)Publication . Esteves, E.; Aníbal, J.; Krug, H.; Da Silva, H. M.; Bianco, Pier GiorgioHelicolenus dactylopterus, Bluemouth is a benthic (200-m)fish species common in the Atlantic Ocean Norway, South-Africa, Azores, Madeira and Canaries, and in the Mediterranean Sea. It is one of the three scorpaenid species increasing economic value captured by the artisanal fleet directions towards the Blackspot, Pagellus Bogaraveo.