This paper presents the available information of the Red seabrem fishery in the 
Strait of Gibraltar and updates the documents presented in previous years with 
the  information  from  the  last  analyzed  year,  2010.  The  document  presents 
data  about  landings,  LPUE,  length  frequencies  and  also  observers  on  board 
programme  information  which  should  be  useful  for  considerations  about  the 
fishery.Versión del edito

Acosta, J.J. (Juan José)

Burgos, C. (Candelaria)

Farias, C. (Carlos)

Gil, J. (Juan)

Soriano, M.M. (María del Mar)

English

This paper presents the available information of the Red seabrem fishery in the 
Strait of Gibraltar and updates the documents presented in previous years with 
the  information  from  the  last  analyzed  year,  2010.  The  document  presents 
data  about  landings,  LPUE,  length  frequencies  and  also  observers  on  board 
programme  information  which  should  be  useful  for  considerations  about  the 
fishery

Gil, Juan

Acosta, Juan José

Soriano, María del Mar

Farias, Carlos

Burgos, Candelaria

Digital.CSIC

The Red seabream (Pagellus bogaraveo) fishery in the Strait of Gibraltar: ICES Subarea IX updated data

This paper presents the available information of the Red seabrem fishery in the 
Strait of Gibraltar and updates the documents presented in previous years with 
the  information  from  the  last  analyzed  year,  2011.  The  document  presents 
data  about  landings,  LPUE,  length  frequencies  and  also  biological  matters
which should be useful for considerations about the fishery

Repositorio Institucional Digital del IEO

 1 Working Document 19 presented to the ICES Working Group on the  Biology and Assessment of Deep Sea Fisheries Resources  ICES WGDEEP - Copenhagen 2-8 March 2011 This Working Document has not been peer-reviewed by ICES WGDEEP and should not interpreted as the view of the Group. The Working Document is appended for information only.  The Red seabream (Pagellus bogaraveo) fishery in the Strait of Gibraltar: ICES Subarea IX updated data. Juan Gil, Juan José Acosta, Mª del Mar Soriano, Carlos Farias and Candelaria Burgos Instituto Español de Oceanografía Centro Oceanográfico de Cádiz  Puerto Pesquero. Muelle de Levante s/n 11006 Cádiz, Spain  Abstract This paper presents the available information of the Red seabrem fishery in the Strait of Gibraltar and updates the documents presented in previous years with the information from the last analyzed year, 2010. The document presents data about landings, LPUE, length frequencies and also observers on board programme information which should be useful for considerations about the fishery.  1. Introduction and fishery description Since the earlies 1980´s an artisanal fishery targeted to the red seabream (Pagellus bogaraveo, namely “voraz”) have been developing along 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 and 2010). Spanish red seabream fishery in the Strait of Gibraltar is almost a monospecific fishery with one clear target species which represents the 74% from the total landed species which constitutes a fleet component by himself (Silva et al., 2002). The Instituto Español de Oceanografía (IEO) began the study and the fishery monitoring following the request from the Fishermen Corporations. In 2006, 2008 and 2010 assessment trials were attempted within the ICES WGDEEP (ICES, 2006, 2008 and 2010). The main objective of this paper is to provide an updated summary of the current status of knowledge on the fishery and biology of this deep-water species in ICES area IX at the 2011 ICES WGDEEP meeting. 2. Material and methods  2 Fishery information was gathered for the period 1983-2010 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). Besides, from 2005 to 2009 a scheme of observers on board “voracera” fleet has been carried out. Sampling level was 5 boats and 3 trips per month. Caught species were recorded in number (including length distribution). A Kolmogorov-Smirnoff test was applied for the comparison between landings and observers on board length distributions. 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, except in 1996 and 1997, till arise the lowest value of the recent years in 2002. 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 the last year. There´s still no scientific reasons which guarantee the sustainability of the recent landings increase in this fishery. Figure 2 shows a sort of fishery footprint from the information obtained with the observers on board programme. Fishing grounds are located at both sides of the Strait of Gibraltar and quite close to the main ports. - LPUEs and CPUEs: Fishing effort increases too till 2009 (Figure 3). 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). Thus, the LPUE trend from the decline of the fishery, 1997, should be interpreted with caution because it cannot be a real image of the resource abundance. Whilst the CPUE trend from the tuning fleet (observers on board programme) shows a totally different situation. The Figure 4 presents the CPUE (number per line) from 2005 to 2009. Values vary around 3 red seabream per ±70 hooks but the general trend seems to be slightly decreasing. - Length frequencies: The fishery resource suffers a decrease of the landed mean length (Figure 5) mainly from 1995 to 1998. 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. The mean  3 length of the landings gets progressively increasing from 1999 onwards, but along the last years the trend varies increasing again from 2006 on in both ports. However the median value from these years remains under the mean in every case and close to the minimum landing size in Algeciras. The mean length from both landing ports became lower in 2010. Figure 6 presents the length distribution from the tuning fleet. Every year of comparison (2005-2009) presents significative differences between those and the landings length distribution. The differences among the sampling protocols adopted may be explained this fact: observes on board did a sort of concurrent sampling while in the fishmarket it had be done a stratified sampling (covering the 4 market categories).  4. Conclusion There is no evidence of the fishery sustainability at the current levels. Control and enforcement of the management measures are desirable. From 2005 till 2009 landings increase every year, exceeding the fishing plans TAC. Landings and mean length decreasing in 2010 remember a recent and similar history from the middle 1990s.  Acknowledgments We would like to express our most sincere gratefulness to all those institutions and people for his collaboration in the execution of the present work: - Instituto Español de Oceanografía. - Consejería de Agricultura y Pesca de la Junta de Andalucía. - People from the Fishermen Brotherhood and Fishmarket of Tarifa, for their readiness and facilities offered to obtain the required samples, especially to Juan José Rodríguez-Santander. - Ricardo Sánchez Leal (called Jordi) for his help with the length distribution figures.  4  References 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., 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).   5 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. 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    Figure 1. Red seabream Spanish fishery of the Strait of Gibraltar: Landings (1983-2010). -6.3 -6.2 -6.1 -6 -5.9 -5.8 -5.7 -5.6 -5.5 -5.4 -5.3 -5.2 -5.135.735.835.93636.136.236.32006-6.3 -6.2 -6.1 -6 -5.9 -5.8 -5.7 -5.6 -5.5 -5.4 -5.3 -5.2 -5.135.735.835.93636.136.236.32005-6.3 -6.2 -6.1 -6 -5.9 -5.8 -5.7 -5.6 -5.5 -5.4 -5.3 -5.2 -5.135.735.835.93636.136.236.32007-6.3 -6.2 -6.1 -6 -5.9 -5.8 -5.7 -5.6 -5.5 -5.4 -5.3 -5.2 -5.135.735.835.93636.136.236.32008-7 -6.5 -6 -5.5 -5 -4.5 -4 -3.5 -33535.53636.537-6.3 -6.2 -6.1 -6 -5.9 -5.8 -5.7 -5.6 -5.5 -5.4 -5.3 -5.2 -5.135.735.835.93636.136.236.32009SpainMoroccoBoat 2Boat 4Boat 3Boat 5Boat 1Boat 2Boat 4Boat 3Boat 5Boat 1Boat 2Boat 4Boat 3Boat 5Boat 1Boat 2Boat 4Boat 3Boat 5Boat 1Boat 2Boat 4Boat 3Boat 5Boat 1TarifaTarifaTarifaTarifa TarifaAlgecirasAlgecirasAlgecirasAlgecirasAlgeciras Figure 2. Red seabream Spanish fishery of the Strait of Gibraltar: Yearly soaking positions footprints from observers on board.  7  Figure 3. Red seabream Spanish fishery of the Strait of Gibraltar: Evolution of the chosen effort unit and estimated LPUE (1983-2010). 2005 2006 2007 2008 2009CPUE 3.054 3.033 3.168 2.891 3.0372.82.82.92.93.03.03.13.13.23.2 Figure 4. Red seabream Spanish fishery of the Strait of Gibraltar: Evolution of the CPUE from the observers on board programme (2005-2009). TOTAL (TARIFA + ALGECIRAS)  8 TARIFA ALGECIRAS Figure 5. Red seabream Spanish fishery of the Strait of Gibraltar: Evolution of the landings length distribution descriptive statistics. 02468101225 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58N (%)Total Length (cm)2005 2006 2007 2008 2009 Figure 6. Red seabream Spanish fishery of the Strait of Gibraltar: Observers on board programme catches length distribution (2005-2009). 

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The Red seabream (Pagellus bogaraveo) fishery in the Strait of Gibraltar: ICES Subarea IX updated data

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