1,721,249 research outputs found
The status of red coral (Corallium rubrum) resource in the Northern and Western coasts of Sardinia
No full textRed coral (Corallium rubrum) in Sardinian sea: main regulations, status and biological features.
No full textThe regulation of the red coral harvesting in Sardinia has a long history. Since 1979, to enable a
sustainable exploitation of coral resource, harvesting has been ruled by the introduction of several
restrictions (Regional Law n. 59 - 5 July 1979 “Coral Fishing Regulation”, partly modified by the
Regional Law n. 23 of 30th May 1989). Taking into account that these regulations could have
affected the status of the red coral banks, the spatial distribution of the deep red coral resource in
the Northern and Western coasts of Sardinian has been studied and, at present, the status of banks
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is continuously monitored. Three zones with different demography and density have been
identified from data on size structure obtained both by ROV video transects and colony sampling
by professional divers. The specific ecological causes affecting the different observed red coral
morphological structures are the object of an ongoing study. Moreover, data on growth pattern
and reproductive biology are presented. Two different growth rates were found for the deep
colonies collected in the Northern and North western coast of Sardinia. Furthermore, the
reproductive features of deep and shallow colonies of C. rubrum, collected between late May and
June, are illustrated and compared. The analyses included the reproductive status of both polyps
and colonies. Important reproductive parameters as fecundity and fertility of both female and
male colonies for different size classes are also described
RECENT RECORDS OF SCHEDOPHILUS OVALIS (OSTEICHTHYES, CENTROLOPHIDAE) FROM SARDINIAN WATERS (CENTRAL-WESTERN MEDITERRANEAN)
No full textThe first occurrence of several young and adult specimens of Schedophilus ovalis (Cuvier, 1833) found at different depths along the coast of Sardinia (Italy) were documented. Morphological and meristic characters of some mature and immature specimens were reported. The presence of this species in Sardinian waters confirms its geographical distribution is progressively and continuously expanding within the Mediterranean basi
Spillover effects of a marine protected area on a exploited lobster Palinurus elephas resource
No full textWe investigated the effects of the Su Pallosu marine protected area (Central western Mediterranean) on the adjacent Palinurus
elephas (Fabricius, 1787) fishery. After 11 years of no-take protection, a gradient of the lobster biomass (Catch Per Unit Effort) from
the interior of the reserve up to a distance of about 20 km from its centre was found. CPUE showed non linear decline with distance
from the centre of the reserve
ON THE GROWTH OF THE EUROPEAN SPINY LOBSTER, PALINURUS ELEPHAS (FABRICIUS, 1787) FROM SARDINIAN WATERS (CENTRAL WESTERN MEDITERRANEAN SEA)
No full textGrowth of spiny lobsters Palinurus elephas was investigated using tagging data. A total of 4044 lobsters were tagged and released between 1997 and 2004 in an area off central-western Sardinia, Italy, where fishing is banned. The growth increments of 248 lobsters, recaptured inside the no-take area and in the surrounding zones, were recorded and analysed with two different procedures, and von Bertalanffy growth parameters were estimated for each sex. Males showed a higher asymptotic carapace length than females (167.9 versus 120.2 mm). Growth increments recorded inside and outside the no-take area did not reveal any density-dependent effects on females. Small but non-significant differences were evident for males, showing faster growth in lobsters caught outside the no-take area
Relazioni trofiche nelle specie di Scorpena (Linneo, 1758) del Mediterranoe centro-occidentale
No full textFeeding habits of three species of Scopraenidae, Scorpaena notata, S.porcus and S.loppei (Osteichthyes, Scopraenidae) as a function of size were investigated to assess the inter and intra specific competition. Crustaceans decapoda were the main food item in all three species. A strong interspecific food overlap was observed in small size classes and between adults (medium and large size classes) of S.porcus and S.notata whereas intraspecific competition between small size classes and adults was high only for S.loppei
Evoluzione dell’incremento ponderale alla muta di Palinurus elephas (Fabricius, 1787) in cattività
No full textThe mean of weight increment at moult for 11 females (41-71 mm CL) and 12 males (35-76 mm CL) of Palinurus elephas (Fabr., 1787) held in tanks was calculated by weekly weight data. The higher percentage of weight increment ( 82% and 73% respectively in females and males) occurs in a week before the exuviation when the spiny lobsters cease feeding (K fase). 7-10 days after exuviation they resume eating; their shells are completely hardened in one month (T fase). Then the weight remains constant during the following S fase until the next K fase
Quattro anni di ripopolamento attivo dell’aragosta rossa Palinurus elephas in un’area della Sardegna centro occidentale
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