Recursos Marinos y Pesquerías

Comunicaciones presentadas en el II FDI de Roma

26/03/14 ,

Entre el 3 y el 6 de marzo de 2014, Pablo Pita asistió al II Simposio Fishery-Dependent Information de Roma. Este es el resumen de la comunicación oral que presentó:

Different alternatives to traditional top-down management have been implemented over the last years in Galicia. Since co-management, largely based on TURFs, is successfully managing some marine benthic invertebrate fisheries, the fishery sector is interested in expanding bottom-up initiatives to other fisheries. The new CFP is also pushing to increase fisher’s involvement in the management of their fisheries, thus European bodies are funding co-management projects, like GAP2 and GEPETO.

GAP2 is using fisher’s TEK for mapping habitats and fishing grounds, and also data loggers and log-books to allocate CPUE of the fisheries in a study area (Ría of Arousa). GEPETO is focused in the management of the Galician octopus fishery.

The octopus fishery is a paradigmatic example of top-down management that generates many conflicts between fishers and policy makers. Managers complain that their regulations are routinely ignored, while fishermen argue that these regulations are implemented without their participation.

Meetings between fishers, scientists and policy makers have been performed to overcome a confrontation that is putting at risk one of the most traditional and economically relevant fisheries in Galicia. In the meetings, organized by GEPETO, information of the octopus fishery was provided by GAP2: interviews were performed to identify the fishing grounds of the fleet, while information on fishing routes and catch, collected in data-loggers and daily log-books, was used to obtain the distribution of CPUE.

We hope that, as a result of the meetings, will be opened a scenario that offers new perspectives for the management of the Galician octopus fishery.

Aquí la presentación:

Y esta es la comunicación en formato poster que también fue presentada en el simposio:

¿Quieres contar peces y no sabes cómo?

07/02/14 ,

En este artículo que acabamos de publicar en Marine and Freshwater Research, comparamos tres métodos para estimar abundancias de peces costeros: mediante buceadores, mediante cámaras de vídeo fijas y mediante ROV.

Además, una foto propia es portada de la revista. La protagonista de la foto, es además la coautora del artículo Diana Fernández-Márquez.

Este es el resumen del artículo:

Comparative works on sampling techniques allow selecting the best methods to study each target fish community. We analysed the structure of a coastal fish community in Galicia (north-western Spain) by comparing the following three techniques: diver-based underwater visual census (UVC), remotely operated vehicle (ROV) and remote underwater video (RUV). All techniques detected abundant and frequent taxa, but divers obtained more precise and complete inventories (80% of identified taxa) than did ROV (60%) and RUV (47%), were faster (only 1.4 days to achieve the estimated taxa list) than were ROV (2.0 days) and RUV (475.7 days), and were more reliable in estimating the abundances of highly mobile, less abundant, less frequent, cryptic and smaller fish. Conversely, RUV obtained the poorest estimates of abundances, and even though it obtained more replicates (136), there were more zeros (98%) than with divers (16 replicates, 64% zeros) and ROV (11 replicates, 75% zeros). Furthermore, the economic cost of the video system was triple the cost of the diving gear; consequently, we recommend using divers to study the coastal fish communities in the shallow waters of the North Atlantic Ocean. However, further research is necessary to explore the full capabilities of video techniques in long-term studies, in greater depths and in adverse weather conditions.

Navajas de Bueu

30/10/13 ,

Por medio del proyecto europeo GAP2 llevamos un tiempo trabajando con una herramienta de evaluación de poblaciones de navaja en colaboración con Jeremy Prince, el Dpto. de Ecoloxía e Bioloxía Animal de la Universidade de Vigo, la Federación Galega de Confrarías de Pescadores, las Confrarías de Aguiño, Cambados y Bueu (más información aquí y aquí).

Pues así es esta pesquería:

Dime lo que comes y te diré lo que eres

24/10/13 ,

Este es el panel que enviamos a la organización del XVI Foro dos Recursos Mariños e da Acuicultura das Rías Galegas, celebrado en la Illa da Toxa, Pontevedra, el 10 y 11 de octubre de 2013.

Y este es el resumen de la comunicación:

Se ha estudiado la ecología alimentaria de la comunidad de peces de los arrecifes rocosos de Galicia mediante el análisis de contenidos estomacales y de las relaciones de ?13C y ?15N de 5 especies de peces. Los valores de ?15N se emplearon después para estimar el nivel trófico de las especies. En general los peces evidenciaron hábitos carnívoros, pero explotaron diferentes recursos: Conger conger (Linnaeus, 1758) y Diplodus sargus (Linnaeus, 1758) se alimentaron de organismos bentónicos y Chelon labrosus (Risso, 1827) de pelágicos, mientras que Dicentrarchus labrax (Linnaeus, 1758) y Labrus bergylta (Ascanius, 1767) fueron menos selectivos. La longitud de la cadena trófica estimada (C. conger NT=3.2) indica que las especies de peces estudiadas representan una parte significativa de esta red trófica costera. En estos ecosistemas, C. conger and D. labrax actúan como súper-depredadores, mientras que C. labrosus, en el otro extremo de la red trófica (NT= 2.4), tiende a ser omnívoro.

Las pesquerías artesanales gallegas, representadas en Amsterdam

19/09/13 ,

A finales del pasado junio Xoán López, el Secretario de la FGCP y un servidor, asistimos a la reunión anual del proyecto GAP2 en Ámsterdam, además también asistimos al Policy Day, una jornada con especial atención hacia la gestión de las pesquerías artesanales y a la Conferencia MARE (seguir leyendo).

Contando peces

09/07/13 ,

La revista Marine and Freshwater Research acaba de aceptar la publicación de un artículo sobre una comparativa de censos mediante buceadores, ROV y cámaras de video remoto (RUV):

Short-term performance of three underwater sampling techniques for assessing differences in the absolute abundances and in the inventories of the coastal fish communities of the Northeast Atlantic Ocean

Pablo Pita, Diana Fernández-Márquez y Juan Freire

Abstract

Comparative works on sampling techniques allow selecting the best methods to study each target fish community. We analysed the structure of a coastal fish community in Galicia (NW Spain) comparing three techniques: diver-based underwater visual census (UVC), remotely operated vehicle (ROV) and remote underwater video (RUV). All the techniques detected abundant and frequent taxa, but divers obtained more precise and complete inventories (80% of identified taxa) than ROV (60%) and RUV (47%); fasters (only 1.4 days to achieve the estimated taxa list), compared to ROV (2.0 days) and RUV (475.7 days); and were more reliable to estimate the abundances of highly mobile, less abundant, less frequent, cryptic and smaller fish. Conversely, RUV obtained the poorest estimates of abundances, and though obtained more replicates (136), obtained more zeros (98%), compared with divers (16 replicates, 64% zeros) and ROV (11 replicates, 75% zeros). Furthermore, the economic cost of the video systems tripled the cost of the diving gears, consequently we recommend using divers to study the coastal fish communities in the shallow waters of the North Atlantic Ocean. However, further research is necessary to explore the full capabilities of video techniques in long-term studies, in great depths or in adverse weather conditions.

MF12301  Accepted 02 July 2013

Proyectos