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Vertical diel dynamic of fish assemblage associated with an artificial reef (Northern Adriatic Sea) Sala, A.; Fabi, G.; Manoukian, S. (2007). Vertical diel dynamic of fish assemblage associated with an artificial reef (Northern Adriatic Sea). Sci. Mar. (Barc.) 71(2): 355-364 In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134

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Beschikbaar in	Auteurs
VLIZ: Open access 123475 [ download pdf ]

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Trefwoorden

Behaviour > Migrations > Vertical migrations Equipment > Remote sensing equipment > Sonar > Active sonar > Multibeam sonar MED, Adriatic Population characteristics > Biomass Structures > Hydraulic structures > Offshore structures > Artificial reefs Adriatic Sea [Marine Regions] Marien/Kust

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Auteurs		Top
Sala, A. Fabi, G. Manoukian, S.

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Abstract

The vertical diel activity of a fish assemblage inhabiting the Senigallia artificial reef (northern Adriatic Sea, Italy) was evaluated from July to November 1996 using enhanced hydroacoustic techniques. Extensive seabed mapping of the area was done using a multibeam echosounder to obtain background imagery of the reef structures and identify the most suitable locations for placing stationary acoustic transducers. Three acoustic transducers were placed inside the reef area, while a fourth was located in the open sea outside the area. Data analysis was conducted on three different depth layers: surface, midwater and bottom. In each layer, diel fish biomass inside the reef showed two peaks, one in the early morning and the other in the late evening. Slightly different behaviour was observed outside the protected area. Comparison of the layers showed that fish biomass was not homogeneously distributed along the water column throughout the sampling period. There were high values in the middle and bottom layers until the end of August. However no, significant biomass variations in time were observed outside the reef where low values were always recorded in each layer.

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