1,720,969 research outputs found
Trophic habits of Red Scorpionfish Scorpaena scrofa (Osteichthyes, Scorpaeniformes) in the Central Western Mediterranean
No full textFeeding habits of Scorpaena scrofa in the Sardinian waters were analysed. The trophic spectrum of this commercial species was mainly composed of teleosts and crustaceans, in particular Decapoda Natantia, followed by Amphipoda and Decapoda Brachiura. The diet changed according to the sex and the size of the specimens
Deep water red coral from the island of Sardinia (north-western Mediterranean): a local example of sustainable management.
No full textSince 1979, red coral harvesting in Sardinia has been regulated by regional laws. The regulations, including a
minimum take size of 10-mm basal diameter, were imposed to limit and control harvesting. Our study indicated that.75%
of the red coral colonies harvested in 2007–08 in the north-western coast were above the legal minimum size for
exploitation. Moreover, extensive surveys with remotely operated vehicles allowed us to document the real structure of
wild populations. Large colonies (.10 mm) represented a big portion of the population (,38% of the total), suggesting
that harvesting effort did not affect yet the maximum size of colonies. All these results seem to be confirmed by the
application of the model of Beverton and Holt. This model shows that the fishery of red coral in Sardinia reaches its
maximum yield at an age at first capture of 20 years, an age significantly lower than the average age of 30 years calculated
for the colonies actually harvested in the Sardinian coast. Our data confirmed that the measures enacted in the Sardinian
regulations provide for an adequate management of this resource and, in addition, can represent a guideline for other
countries that still lack a valid management plan
Preliminary data on red coral Corallium rubrum (Linneo, 1758) population of Sardinia sea (western Mediterranean)
No full textNote of historical and actual exploitation of Corallium rubrum(L.,1758) in the Central Mediterraenan
No full textGrowth of a bathyal species, Alepocephalus rostratus, from the Sardinian Channel = Acrescimento di una specie batiale, Alepocephalus Rostratus, nel Canale di Sardegna
No full textData on age estimation and growth of Alepocephalus rostratus (Osteichthyes) (TL 9.7-45.7 cm) in the Sardinian Channel (Central-Western Mediterranean) are reported. High correlations between morphometric variables (TL, WT, OL, OW) were found. Considering the otolith rings as annual, this species was found to be very long-lived (maximum 21 yr) with a very slow growth rate
NOTE ON HISTORICAL AND PRESENT EXPLOITATION OF CORALLIUM RUBRUM (LINNEO, 1758) IN THE CENTRAL WESTERN MEDITERRANEAN
No full textThe analyses of the landings and CPUE data from 1978 to 2005 for red coral in Sardinian seas (Central Western Mediterranean) were made. A statistical decrease in the landings can be observed. This reduction resulted very close to the decrease in the number of boats harvesting red coral. CPUE analysis at last allow to know that the average yearly amount of red coral landings by diver resulted steady with tim
The reproductive cycle of a deep-sea eel, Nettastoma melanurum (Nettastomatidae: Anguilliformes) from the south-eastern Sardinian Sea (central-western Mediterranean)
No full textThe reproductive cycle of the deep-sea eel Nettastoma melanurum was described based on 397 specimens (171 males and 226 females). Experimental trawl surveys between depths of 772 and 1598 m and commercial hauls (580-600 m) on compact mud bottoms off the south-eastern Sardinian waters (central-western Mediterranean) were carried out. The Sardinian catches did not indicate any particular trend of size-range in relation to depth in both sexes and seem to be sexually dimorphic with females growing almost 9A cm longer than males at maximum lengths. It was a dioeceous and an oviparous deep-sea species. For females and males, six stages of oocyte development, characterizing the different stages of maturity, were identified. Histological examination demonstrated that ovaries of N. melanurum showed a 'group-synchronous' pattern, highlighting a type of monocyclic ovary. The species showed a size at first maturity of 53.5 cm and 50.5 cm total length in females and males respectively. The reproductive period appeared to be unique and well defined in both sexes. Their monthly changes of gonadosomatic index and maturation phases of ovaries and testis showed that the species was in a resting period from March to July. Vitellogenesis and spawning began in September and ended in January. Nettastoma melanurum seemed to be a fecund species (8132-18755 eggs)The reproductive cycle of the deep-sea eel Nettastoma melanurum was described based on 397 specimens (171 males and 226 females). Experimental trawl surveys between depths of 772 and 1598 m and commercial hauls (580-600 m) on compact mud bottoms off the south-eastern Sardinian waters (central-western Mediterranean) were carried out. The Sardinian catches did not indicate any particular trend of size-range in relation to depth in both sexes and seem to be sexually dimorphic with females growing almost 9A cm longer than males at maximum lengths. It was a dioeceous and an oviparous deep-sea species. For females and males, six stages of oocyte development, characterizing the different stages of maturity, were identified. Histological examination demonstrated that ovaries of N. melanurum showed a 'group-synchronous' pattern, highlighting a type of monocyclic ovary. The species showed a size at first maturity of 53.5 cm and 50.5 cm total length in females and males respectively. The reproductive period appeared to be unique and well defined in both sexes. Their monthly changes of gonadosomatic index and maturation phases of ovaries and testis showed that the species was in a resting period from March to July. Vitellogenesis and spawning began in September and ended in January. Nettastoma melanurum seemed to be a fecund species (8132-18755 eggs)
First evaluation of the relationships between the morphology of coral colonies and currents in Sardinian seas
No full textFirst evaluation of the relationships between the morphology of coral colonies and currents in Sardinian seas
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