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Marine research at <strong>CNR</strong>Figure 2: Otolith image with its nucleus and daily rings.increments in otoliths are used to determineage for several anchovy species[28, 23, 29, 30, 31, 32, 24, 26] and allow,in juvenile fishes, to record growth patternsin the first year of life.In the present paper, data from threeoceanographic surveys together withgrowth data were analyzed to study the spatialdistributions and processes regulatingrecruitment such as growth and mortality.Moreover, we posed the question if habitatfeatures can be associated to favourite anchovyjuvenile growth areas, and if growthdifferences between areas or time lags mayaffect recruitment strength.2 Materials and methods2.1 Juvenile dataJuvenile samples of European anchovywere collected during the recruitment surveysconducted on board of R/V “Dallaporta”during 2001 (4-17 October), 2004(7-19 October) and 2005 (5-13 October).The catches were performed by means ofa mid-water trawl-net with an opening of14 x 7 m, and with the cod-end meshsizeof 19 mm (stretched) in the Straits ofSicily (Figure 1). The mesh size is withinthe range of cod-mesh size for these studies[33]. For each positive trawl an anchovyrandom sub-sample was measuredon board in order to obtain total (TL) andstandard length (SL) to the nearest 1 mm,and total body weight (TW) to the nearest0.1 g by means of a scientific portablemarine scale (Marel S182). Otoliths wereextracted from specimens up to 130 mmTL, i.e. the mean measurement whichrepresents the length when anchovy juvenilesare expected to become adults (oneyear old juveniles; [10]). For each trawl25-50 sagittal otolith pairs – five specimensfor each 0.5 cm size class – wereextracted, cleaned and dry-stored in blackplastic moulds. The trawl cod-end meshsizedid not allow retaining specimens lessthan 45 mm SL.2.2 Oceanographic data and juvenilehabitat characterizationA CTD probe (Minisonde 4a, Hydrolab)was deployed up to a 100 m depth (Figure1) to obtain temperature, salinity andoxygen profiles along the water column ineach station. Data interpolation and mappingwere achieved by means of OceanData View software [34]. Habitat measurementswere obtained averaging the data ofthe two-three CTD stations nearest to eachtrawl.2057
Fishery and Sea ResourcesFigure 3: Depth averaged temperature surface contour plots (0-40 m) with the CTD stations() and the anchovy juveniles total lengths average for each trawl and year (a, b andc ); the depth section plots (d, e and f), are the respective NW-SE temperature contoursections.2058
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