Mantenimiento de los colectoresprofundos de langosta, obtención de larvas filosomas y filmaciones submarinas con video cebado.

Mantenimiento de los colectoresprofundos de langosta, obtención de larvas filosomas y filmaciones submarinas con video cebado.

Evaluation of the impact and interaction of gill art aimed at (Scratch) with the bottom, with the benthic species and with the habitats

1. To obtain estimates of Nephrops burrows densities in the Gulf of Cádiz from a randomized isometric grid of UWTV stations spacing 4 nautical miles using the underwater images. 2. To define the Nephrops distribution in the Gulf of Cádiz 3. To obtain density estimates of bentho-demersal macrofauna species 4. To calibrate bentho-demersal macrofauna observed in the underwater videos and those obtained in the beam trawl. 5. To obtain and the occurrence of trawl marks on the sea bed 6. To measure oceanographic variables using a sledge mounted CTD 7. To collect sediment samples 8. To prospect circalittoral and bathyal areas without trawling activity 9. Sea bed morphological and backscatter analyses

1. To obtain estimates of Nephrops burrows densities in the Gulf of Cádiz from a randomized isometric grid of UWTV stations spacing 4 nautical miles using the underwater images. 2. To define the Nephrops distribution in the Gulf of Cádiz 3. To obtain density estimates of bentho-demersal macrofauna species and the occurrence of trawl marks on the sea bed 4. To calibrate bentho-demersal macrofauna observed in the underwater videos and those obtained in the beam trawl. 5. To measure oceanographic variables using a sledge mounted CTD 6. To prospect circalittoral and bathyal areas without trawling activity

COL_MAERL.El objetivo del proyecto es evaluar el impacto acumulado de la pesca sobre los fondos de maërl comparando fondos impactados fuera de la reserva marina de las Islas Columbretes con fondos protegidos, durante más de dos décadas, dentro de la reserva. Este conocimiento informará del desarrollo de métodos de pesca que promuevan actividades sostenibles en el área de estudio. Por lo tanto, en esta campaña los objetivos principales son: 1)Obtener información sobre la distribución de los fondos de maërl en la zona de estudio, mediante observaciones puntuales con cámara sumergible (IPSE). 2)Comparar la composición de las especies indicadoras y estructurales de los fondos de maërl/rodolitos en cuanto a la composición de especies, morfotipos y tamaños. Para ello se realizarán muestreos del bentos mediante dragas. 3)Obtener índices de abundancia y demografía de langosta mediante vídeo cebado. Las tomas de video se llevaran a cabo en zonas con distintos niveles de protección, tanto en el interior de la reserva como en el entorno más cercano. 4) Analizar en detalle las muestras obtenidas con las dragas, con el fin de detectar cambios en la estructura de las comunidades algales y faunales de los fondos de maërl/rodolitos, comparando localidades en un gradiente de presión pesquera.

Mantenimiento de los colectoresprofundos de langosta, obtención de larvas filosomas y filmaciones submarinas con video cebado.

The main objective foreseen in the ECOMARG 2021 campaign, to be carried out on board the R/V Ángeles Alvariño (IEO), is the study of the spatial distribution, structure and dynamics of vulnerable habitats of the ZEC “El Cachucho” (Le Danois Bank and its internal basin) and the head of the nearby Lastres canyon. Specific objectives: • Estimation of the abundance and spatial distribution of the epibenthic communities that characterize the vulnerable habitats present in the area, with special priority for the classified as 1170 Reefs in the DH. • Monitoring of the conservation status of vulnerable habitats and their communities biological, using fixed sampling stations, through indicators of the Red Natura 2000, in accordance with article 17 of the Habitats Directive, applying technical photogrammetric. • Geophysical study of the Lastres and Llanes canyons by obtaining cartography high resolution. • Characterization of the oceanographic dynamics of the BBL (Benthic Boundary Layer - layer near the bottom) in the Gaviera Canyon and in the fixed sampling stations from El Cachucho to know the environmental characteristics of the habitats 1170. • Study of the mobile species (mainly fish, crustaceans, and mollusks) of the Vulnerable habitats present at fixed sampling stations using platforms multiparametric (landers).

Study of strategies to reduce discards and unwanted species: selectivity and survival in trawling in Cantabrian-Northwest zone.

- To obtain estimates of Nephrops densities through underwater videos with photogrammetric sled. - To obtain estimates of Nephrops burrows dendity. - To delimit the distribution of Nephrops in the Gulf of Cádiz. - To obtain estimates of bento-demersal macrofauna density present in the Nephrops fishing ground. - To calibrate bentho-demersal macrofauna observed in the underwater videos and those obtained in the beam trawl. - To prospect non-draggable areas of the circalitoral and batial to know the state of the bottom and the presence of commercial resources. - To gather complementary information on the action of the trawl gear in the seabed. - Oceanographic data collection. - Morphological analysis and acoustic response of the substrate through data acquisition bathymetry and reflectivity, as well as very high resolution seismic profiles of areas already prospected or pending to prospect. - To collect of sediment samples for sedimentological and community characterization of endofauna. - To explore the Portuguese continental margin of the Gulf of Cádiz near the Spanish border in relation to the continuity of the distribution of Nephrops and characterization seabed.