Publication
Age and growth of the Atlantic chub mackerel Scomber colias Gmelin, 1789 off Madeira Island
| dc.contributor.author | Vasconcelos, Joana | |
| dc.contributor.author | Dias, Manuel A. | |
| dc.contributor.author | Faria, Graça | |
| dc.date.accessioned | 2011-10-07T10:58:01Z | |
| dc.date.available | 2011-10-07T10:58:01Z | |
| dc.date.issued | 2011 | |
| dc.description.abstract | The Atlantic chub mackerel, Scomber colias Gmelin, 1789, is one of the main fisheries resources of Madeira Island. It is caught by a small and coastal purse-seine fleet that traditionally operates around the island. From January 2002 to December 2003, monthly samples of chub mackerel were collected from landings by this commercial fishing fleet. A total of 2212 sagitta otoliths were extracted for age readings from 1068 males (17.4-41.7 cm total length, TL), 1066 females (18.0-41.2 cm TL) and 78 undetermined (13.0-26.8 cm TL). A single reader aged the fishes using surface-read whole otoliths aiming to build annual age-length keys. Age readings precision and reader consistency were assessed by using the average percentage error index (APE ≤ 1.52). Ages were validated up to 4 years using marginal analyses. Estimated mean lengths at age and length von Bertalanffy growth curve parameters, estimated by non-linear methods, showed no significant differences (p>0.05) between sexes (L∞=50.08 cm TL, k=0.252 yr-1 and t0=-1.339 yr; males and females combined). Length-weight relationships were estimated aiming to convert growth in length to growth in weight. No differences between sexes were found in length-weight parameters (P>0.05). For sexes combined, total weight (TW, g) = 0.00218.LT 3.40 and the estimated asymptotic weight, W∞=1523.7 g. | por |
| dc.identifier.citation | "ARQUIPÉLAGO. Life and Marine Sciences". ISSN 0873-4704. Nº 28 (2011): 57-70 | por |
| dc.identifier.issn | 0873-4704 | |
| dc.identifier.uri | http://hdl.handle.net/10400.3/1228 | |
| dc.language.iso | eng | por |
| dc.publisher | Universidade dos Açores | por |
| dc.relation.ispartofseries | Ciências Biológicas e Marinhas = Life and Marine Sciences;28 | |
| dc.subject | Average Percent Error Index | por |
| dc.subject | Length-weight Relationship | por |
| dc.subject | Otolith Age Reading | por |
| dc.subject | Scomber japonicus | por |
| dc.subject | Madeira Island | por |
| dc.title | Age and growth of the Atlantic chub mackerel Scomber colias Gmelin, 1789 off Madeira Island | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | por |
| rcaap.type | article | por |