This paper presents the available information of the Red seabream (Pagellus bogaraveo) Spanish fishery in the Strait of Gibraltar and updates the documents presented in previous years with the information from 2014. This document presents Spanish data about landings, LPUEs, and landings length frequencies

Acosta, J.J. (Juan José)

Burgos, C. (Candelaria)

Canoura, J. (Jesús)

Farias, C. (Carlos)

Gil, J. (Juan)

Soriano, M.M. (María del Mar)

English

Repositorio Institucional Digital del IEO

 1 Working Document presented to the ICES Working Group on the  Biology and Assessment of Deep Sea Fisheries Resources  ICES WGDEEP - Copenhagen 20 - 27 March 2015 This Working Document has not been peer-reviewed by ICES WGDEEP and should not being interpreted as the view of the Group. The Working Document is appended for information only.  Updating the available information from Spanish Red seabream fishery in the Strait of Gibraltar  Juan Gil, Carlos Farias, Jesús Canoura, Juan José Acosta, Mar Soriano and Candelaria Burgos Centro Oceanográfico de Cádiz Puerto Pesquero. Muelle de Levante s/n 11006 Cádiz, Spain  Abstract This paper presents the available information of the Red seabream (Pagellus bogaraveo) Spanish fishery in the Strait of Gibraltar and updates the documents presented in previous years with the information from 2014. This document presents Spanish data about landings, LPUEs, and landings length frequencies.   1. Introduction and fishery description  Since the earlies 1980´s an Spanish artisanal fishery targeted to the Red seabream (Pagellus bogaraveo, namely “voraz”) have been developing in the Strait of Gibraltar area (ICES IXa South). This fishery has already been broadly described in previous Working Documents presented to the ICES WGDEEP (Gil et al., 2000; Gil & Sobrino, 2001, 2002 and 2004; Gil et al., 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 and 2014). Spanish Red seabream fishery in the Strait of Gibraltar is almost a mono-specific fishery with a clear target species which represents the 74% from the total landed species which constitutes a fleet component by itself (Silva et al., 2002). The Spanish Oceanographic Institute (IEO) began the study and the fishery monitoring following the request from the Fishermen Corporations. In 2006, 2008, 2010 and 2012 different assessment trials were attempted within the ICES WGDEEP (ICES, 2006, 2008, 2010 and 2012). Last year the scientific advice was based on abundance indexes (DLS category 3). Our future goal is to become in DLS 1 (stocks with quantitative assessments) developing a gadget model to analyze and integrate all the available information to be reviewed in 2017 Benchmark Group.  2 While, the main objective of this paper is to provide an updated summary of the available fishery information of this deep-water species in ICES area IX to the 2015 ICES WGDEEP meeting.  2. Material and methods  Fishery information was gathered for the period 1983-2014 from the sale sheets: monthly landings, monthly number of sales and the number of days in which those sales were carried out. Moreover, from the beginning of the IEO monitoring, June 1997, an ad hoc monthly length samplings from the different commercial sizes are carrying out to estimate the landings length distribution (Gil et al., 2000). A sort of Vessel Monitoring System, called SLSEPA, data from the Strait of Gibraltar “voracera” fleet were available for the period 2009 to 2013 (Gil et al., 2014). Boats carry a device, regionally called “green boxes” (to differentiate them from the EU VMS “blue boxes”), that transmit hour and positions (provided by GPS), course and speed to the control centre every three minutes. Data were filtered and analysed to estimate fishing effort, catch rates and the spatial distribution of the Red seabream fishery (Burgos et al., 2013). Unfortunately it cannot be updated this year because we haven´t had time to finish it.  3. Results and discussion  - Landings data: Figure 1 shows a continuous increase of the landings to a maximum in 1994. Since 1994 landings have gone decreasing till 2002, except in 1996 and 1997. Then, from 2003 onwards it shows an increasing trend till reached the highest value of the last years in 2009, followed by a new decrease till 2013, with the lowest value of the recent years. In 2014 landings increase more than the 100% in comparison with the previous year. - LPUEs: Fishing effort increases too till 2009 (Figure 2). It is important to emphasize that the effort unit chosen (number of sales) cannot be too appropriate as do not consider the missing effort. Thus, in the years when the resource is not so abundant the missing effort increases substantially (fishing vessels with no catches, so no sale sheet were recorded). So, the LPUE trend from the decline of the fishery, 1997, should be interpreted with caution because it  3 cannot be a real image of the resource abundance. Anyway the decreasing trend since 2010 is quite clear but in 2014 increase again, like landings. - Length frequencies: The fishery resource suffers a decrease of the landed mean length (Figure 3) mainly from 1995 to 1998 and from 2009 to 2013. It is necessary to point out that species probably does not have a homogeneous geographic and bathymetric distribution related to their length. This fact could explain the different landed mean length between the main landing ports: Tarifa and Algeciras. So the mean length became lower since 2010 but again (like landings and CPUE) increases in 2014 with a total length median and mean value of 36 and 37.6 cm, respectively.  4. Main conclusions  2014 signals (landings, LPUE and length distribution) shows clear increasing trends. However, there is no evidence about its sustainability so further steps toward the fishery analytical assessment (i.e. gadget model development) should be encouraged.  Acknowledgments We would like to express our most sincere gratefulness to all those institutions and people for their collaboration in the execution of the present work: - Spanish Oceanographic Institute (IEO). - Consejería de Agricultura y Pesca de la Junta de Andalucía. - People from the Tarifa´s Fishermen Brotherhood and Fishmarket for their readiness, especially to Juan José Rodríguez-Santander.  References BURGOS, C., J. GIL and L.A. del OLMO, 2013. The Spanish blackspot seabream (Pagellus bogaraveo) fishery in the Strait of Gibraltar: Spatial distribution and fishing effort derived from a small-scale GPRS/GSM based fisheries vessel monitoring system. Aquatic Living Resources, 26: 399–407.  4 GIL, J., J. J. ACOSTA, C. FARIAS and M.M. SORIANO, 2012. Updating the information about the Red seabream (Pagellus bogaraveo) Spanish fishery in the Strait of Gibraltar (ICES Subarea IX). Work. Doc. to the 2012 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., J. J. ACOSTA, M.M. SORIANO, C. FARIAS and C. BURGOS, 2011. The Red seabream (Pagellus bogaraveo) fishery in the Strait of Gibraltar: ICES Subarea IX updated data. Work. Doc. to the 2011 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., J. CANOURA, C. BURGOS and C. FARIAS, 2005. Update of the Red seabream (Pagellus bogaraveo) fishery data in the Strait of Gibraltar (ICES IXa south) including biological information. Work. Doc. to the 2005 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., J. CANOURA, C. BURGOS and C. FARIAS, 2010. The Red seabream (Pagellus bogaraveo) Spanish fishery in the Strait of Gibraltar: Useful information that should be considered for the ICES Subarea IX assessment update exercise. Work. Doc. to the 2010 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., J. CANOURA, C. BURGOS, C. FARIAS and V. POLONIO, 2008. Red seabream (Pagellus bogaraveo) assessment of the ICES IX from the information available of the fishery in the Gibraltar Strait. Work. Doc. to the 2008 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., J. CANOURA, C. BURGOS and I. SOBRINO, 2007. Red seabream (Pagellus bogaraveo) fishery of the Strait of Gibraltar (ICES IXa south): Update of the available information. Work. Doc. to the 2007 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., C. FARIAS, J. CANOURA and J.J. ACOSTA, 2013. The Red seabream fishery in the Strait of Gibraltar: update of the available information from the fishery statistics and some considerations about the current knowledge on the target species growth. Work. Doc. to the 2013 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., C. FARIAS, C. BURGOS, J.J. ACOSTA and J. CANOURA, 2014. The red seabream fishery in the Strait of Gibraltar: an update of the available information. Work. Doc. to the 2014  5 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., I. SOBRINO and M. P. JIMÉNEZ, 2000. A brief description of the Strait of Gibraltar red seabream (Pagellus bogaraveo) fishery. Working Document to the 2000 Report of the ICES S.G. on the Biology and Assessmnet of Deep-sea Fisheries Resources (SGDEEP). GIL, J. and I. SOBRINO, 2001. New biological information about the red seabream (Pagellus bogaraveo) of the Strait of Gibraltar (ICES IXa). Work. Doc. to the 2001 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J. and I. SOBRINO, 2002. Update of the information about the red seabream (Pagellus bogaraveo) from the Strait of Gibraltar (ICES IXa south). Work. Doc. to the 2002 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J. and I. SOBRINO, 2004. Red seabream (Pagellus bogaraveo) fishery of the Strait of Gibraltar (ICES IXa south): Update of the information available. Work. Doc. to the 2004 Report of the ICES Working Group on the Biology and Assessement of Deep-Sea Fisheries Resources (WGDEEP). GIL, J., I.SOBRINO and J. CANOURA, 2003. Update of the information about the red seabream (Pagellus bogaraveo) fishery in the Strait of Gibraltar (ICES IXa south). Work. Doc. to the 2003 Report of the ICES Working Group on the Biology and Assessment of Deep-Sea Fisheries Resources (WGDEEP). ICES, 2006. Report of the Working Group on the Biology and Assessment of Deep-sea Fisheries Resources. ICES CM 2006/ACFM: 28. ICES, 2008. Report of the Working Group on the Biology and Assessment of Deep-sea Fisheries Resources. ICES CM 2008/ACOM: 14. ICES, 2010. Report of the Working Group on the Biology and Assessment of Deep-sea Fisheries Resources. ICES CM 2010/ACOM: 17. ICES, 2012. Report of the Working Group on the Biology and Assessment of Deep-sea Fisheries Resources. ICES CM 2012/ACOM: 17. SILVA, L., J. GIL and I. SOBRINO, 2002. Definition of fleet components in the Spanish artisanal fisheries of the Gulf of Cádiz (SW Spain, ICES Division IXa). Fisheries Research 59 (2002):117-128. 6   010020030040050060070080090019831984198519861987198819891990199119921993199419951996199719981999200020012002200320042005200620072008200920102011201220132014Tons Figure 1. Red seabream Spanish “voracera” fishery of the Strait of Gibraltar: Landings (1983-2014).  020406080100120020004000600080001000012000LPUEFishing effort (Nº sales)Nº sales (Tarifa & Algeciras) LPUE Figure 2. Red seabream Spanish fishery of the Strait of Gibraltar: Evolution of the chosen effort unit (number of sales as a fishing trip proxy) and its estimated LPUE (1983-2014).  7    Figure 3. Red seabream Spanish fishery of the Strait of Gibraltar: Evolution of the landings length distribution (total and by landing port) descriptive statistics (red dot: mean value, red line: median value). TOTAL TARIFA ALGECIRAS 

Updating the available information from Spanish Red seabream fishery in the Strait of Gibraltar

Gil, Juan

Farias, Carlos

Canoura, Jesús

Acosta, Juan José

Soriano, María del Mar

Burgos, Candelaria

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/9670/1/WD_Strait%20of%20Gibraltar%20RSB%20Spanish%20fishery%20info.pdf

Updating the available information from Spanish Red seabream fishery in the Strait of Gibraltar

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