1,721,073 research outputs found
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
Reproductive development versus estimated age and size in a wild Mediterranean population of Octopus vulgaris (Cephalopoda: Octopodidae)
No full textFirst investigation on the relationship between reproductive development and estimated age/size in a wild population of Octopus vulgaris was performed in the Sardinian waters (central western Mediterranean Sea) in order to have a useful tool for integral fishing management in the area. Full sexual maturity was registered from April to August for females with a peak in summer whereas for males it was observed all year round. Size at maturity was 320 g for males (70 mm dorsal mantle length (ML)) and 520 g for females (120 mm ML). From 61 to 465 and from 80 to 390 daily growth increments were counted on the lateral wall of the upper beak, respectively in males and females, obtaining a positive relationship between estimated age and size of the specimens. The sexual maturation was primarily size-dependent with a secondary role played by the age especially in males. The estimated age of 390 and 465 days respectively of the largest female (4661 g) and male (5344 g) as well as that of two males at the end of their lives ('spent') of 310 and 420 days old, have suggested a lifecycle of about 1 year for both genders
Male reproductive system in Neorossia caroli (Joubin, 1902) (Cephalopoda: Sepiolidae) from the Sardinian waters (western Mediterranean Sea)
No full textThe male reproductive system of the bobtail squid Neorossia caroli (Cephalopoda: Sepiolidae) is described
in details for the first time, basing on 90 mature males caught from 500 to 1600 meters in the Sardinian
waters (western Mediterranean Sea). Up to 83 spermatophores were found inside the Needham‘s Sac.
Medium spermatophore length was 16.7 mm. Sperm mass, cement body and ejaculatory apparatus represented
52.4%, 29.3% and 29.7%, respectively, of the total spermatophore length. Empty spermatophores,
spermatophore sheaths and spermatangia also were found in the sac and are described.
Spermatangia implanted in several parts of males body (e.g. head, funnel and eyes) were recorded and
their occurrence is discussed. The spermatophoric reaction was induced in the laboratory by submerging
spermatophores in seawater and it is describe
Using historical series of trawl surveys data to investigate cephalopod life cycles. A new methodological approach towards an integrated fishery science
No full textON 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
On the abundance and spatial distribution of Illex coindetii and Eledone moschata in the Sardinian Seas (central - western Mediterranean) – A preliminary and qualitative investigation with special attention to some environmental constraints
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Findings of the Green algae Penicillus capitatus Lamarck, in South Sardinia (Western Mediterranean)
No full textQuattro anni di ripopolamento attivo dell’aragosta rossa Palinurus elephas in un’area della Sardegna centro occidentale
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