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| Carrera, Pablo; Churnside, J.h.; Boyra, G; Marques, V; Scalabrin, Carla; Uriarte, A. |
| The feasibility of using airborne lidar (Light Detection and Ranging) was studied to assess the early juvenile fractions of the main pelagic fish species of the coastal Atlantic waters of southern Europe (anchovy, sardine, mackerel, and horse mackerel). Field comparisons with more established echosounder methods were undertaken in the summers of 1998 and 1999 during the recruitment period of sardine and anchovy in the selected areas, in the presence of a variety of oceanographic and environmental conditions. Backscattered energies as well as the types of target recorded by both devices were compared. The distributions of energies and the shape of the targets were generally similar for both techniques, with moderate numerical correlation between sensors,... |
| Tipo: Text |
Palavras-chave: West Iberian Peninsula; Sardine; Recruitment; Echosounder; Bay of Biscay; Anchovy; Airborne lidar. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2139.pdf |
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| Silva, A; Carrera, P; Masse, Jacques; Uriarte, A; Santos, M; Oliveira, P; Soares, E; Porteiro, C; Stratoudakis, Y. |
| This study describes broad-scale spatial variations in sardine growth across the northeastern Atlantic and Mediterranean waters using opportunistic samples collected in recent years. More detailed information on spatial, decadal and seasonal growth variations is provided for the Iberian-Biscay region using data collected in acoustic surveys since the mid-1980s. Growth curves are fitted to annual or monthly length-at-age data using a robust Von Bertalanffy model; parameters for recent samples are compared with literature information using an auximetric plot while differences between areas within the Iberian-Biscay region are tested by log-likelihood ratio tests. Sardine growth performance is generally lower in the Mediterranean and declines across the... |
| Tipo: Text |
Palavras-chave: Iberian Biscay region; Spatio temporal variation; Growth; Sardina pilchardus. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4078.pdf |
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