Yellowtail flounder, redfish (Sebastes spp.) and witch flounder indices from the Spanish Survey conducted in Divisions 3NO of the NAFO Regulatory Area
Since 1995, Spain carries out a spring stratified random bottom trawl survey in Div. 3NO of the NAFO Regulatory Area. Total mean catches, biomass and mean numbers for yellowtail flounder (Limanda ferruginea) are presented for the period 1995-8 for redfish (Sebastes spp.) for the period 1997-2018 and...
| Autores: | , , |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/329394 |
| Acesso em linha: | http://hdl.handle.net/10261/329394 |
| Access Level: | acceso abierto |
| Palavra-chave: | Centro Oceanográfico de Vigo Pesquerías |
| Resumo: | Since 1995, Spain carries out a spring stratified random bottom trawl survey in Div. 3NO of the NAFO Regulatory Area. Total mean catches, biomass and mean numbers for yellowtail flounder (Limanda ferruginea) are presented for the period 1995-8 for redfish (Sebastes spp.) for the period 1997-2018 and for witch flounder (Glyptocephalus cynoglossus) for the period 2002-2018. Detailed indices are presented from 2013. Yellowtail flounder indices do not show a clear trend. Biomass increased from 1997 to 1999 has maintained almost constant values until 2013 and then decreased in 2014-2018. Redfish indices oscillate greatly over time, probably because the gear does not sample adequately aggregating pelagic species. There was a sharp increase in 2009 and since then until 2015, biomass fluctuated maintaining higher values than before 2009. In 2016 biomass dropped and increase again in 2017-2018 to the 2012 level. The 3N division comprises around the 90% of the total biomass in the last years. Good year classes have not been registered recently. Length distribution in thousands (abundance) by Division and year since 2002 is presented. Following the trend of the biomass, most of the abundance corresponds to Division 3N. Witch flounder is very scarce and its indices fluctuated throughout the series reaching the minimum value in 2014 and 2018, with an increasing trend in the middle time. Recruitment was quite good at the beginning of the series but poor in recent years. |
|---|