Scientific Cooperation to Support Responsible Fisheries in the Adriatic Sea General Fisheries Commission for the Mediterranean (GFCM) Scientific Advisory Committee (SAC) Subcommittee on Stock Assessment (SCSA) - Rome, September 2005 Anchovy (Engraulis encrasicolus, L.) stock assessment in the Adriatic Sea: N. Cingolani a, A. Santojanni a, E. Arneri a, A. Berlardinelli a, S. Colella a, F. Donato a, G. Giannetti a, G. Sinovcic b, B. Zorica b, B. Marceta c a Istituto di Scienze Marine - Sezione Pesca Marittima, Ancona (Italy) b Institute of Oceanography and Fisheries, Split (Croatia) c Fisheries Research Institute of Slovenia, Ljubljana (Slovenia)
FAO – Fishing area 37: Mediterranean and Black Sea - GSA GSA 17
Map showing the boundaries of the Adriatic Sea Geographical Sub-Areas (formerly Geographical Management Units) as originally indicated by the GFCM (solid line) and with the recent revision (dotted line)
Fishing gear used Mid-water pair trawls (volante) Purse seines with light (lampara)
Trieste Grado Marano L Caorle Chioggia Goro P. Garibaldi Cesenatico Rimini Cattolica ITALY: List of ports Fano Ancona S. Benedetto T Giulianova = sampling port = main port Vieste
SLOVENIA: List of ports Izola Koper Piran Portoroz = sampling port
Novigrad Umag Porec Rovinj CROATIA: List of ports Pomer Lovran M. Draga Ika Opatija Rijeka Kraljevica Crikvenica Krk Novi Vinodolski Senj Cres Rab Mali Losinj Pag Zadar Sali Vrgada Biograd Vodice Sibenik Primosten Trogir Split Omis Brac Postira Makarska Hvar Komiza Korcula Vela Luka Ploce (Metkovic) Ston (Broce) Vis Slano Lastovo Dubrovnik Cavtat Novigrad Pula (Vodnjan) Labin (Rabac) = sampling port
Data collection Monthly and daily landings Fishing effort Biological sampling Sub-sampling Catch-weighted length frequency (0.5 cm length class) CPUE Standardised fishing effort Age-length keys Data obtained Time series of catch and effort data
Adriatic (northern and central) anchovy landed catches
Adriatic (northern and central) sardine landed catches
The trend of mid - year total (=stock) biomass at sea derived fromthe VPA performed using data from 1976 to 2004, is compared with the average density (t/nm 2 ) of anchovy, obtained by acoustic survey in North Adriatic ( ; in 2002 and 2003 acoustic survey was not performed )
Anchovy GSA17: CPUE calculated for the fleet of Porto Garibaldi (mid-water trawlers or volanti), from 1976 to 2004
Anchovy GSA17: empirical relationship between the abundance at sea of spawners in the year n and recruits in the year n+1 (the latter being reported near the data points), on the basis of VPA estimates
Conclusions Stock biomass of anchovy dropped at very low level in After this collapse a slow, but continuous recovery of biomass took place. The present assessment shows a stronger recovery during last two years. Due to high biomass fluctuations of small pelagics it is recommended to maintain the current level of fishing effort.