1,721,021 research outputs found
Master Degree: Induction de la maturation des ovocytes de Coquille Saint Jacques (Pecten maximus) et declenchement de la ponte par des neurotransmetteurs: serotonine-like, dopamine-like et prostaglandine PGE2
No full textPecten maximu
Nursery survey of Nursehound, Scyliorhinus stellaris (Linnaeus, 1758), around Monte Argentario peninsula (Tuscany, Italy) with new tools Poseidon R.O.V. (Remote Operative Vehicule)
No full textThe Nursehound, Scyliorhinus stellaris (Linnaeus, 1758), is a benthonic catshark present inshore and offshore in the northeast and eastern central Atlantic, over the continental shelf between southern Scandinavia and Senegal, and is also distributed throughout the Mediterranean. This species is fished by bottom trawls, gill nets, bottom set long lines, handlines and fixed bottom nets, and occasionally by pelagic trawls. Although limited data are available on the exploitation and trends in abundance, declines have been indicated in the Mediterranean Sea, particularly around the Balearic Islands and in the northwest Mediterranean. The capacity for resilience of this species is affected by a low level of interconnectivity between isolated populations around islands far from the continental coast. Few informations are available on its biology; however, it is a large bodied species and is likely more vulnerable to population depletion than the Smallspotted Catshark (S. canicula), which also occurs in the region. Given its large size, patchy distribution and evidence of decline in the Mediterranean Sea, an assessment of at least Near Threatened is warranted (IUCN Red List. 2009). In 2018 Sharks Studies Centre activated a new project aimed at locating, around Monte Argentario Pensinsula in Tuscany (Ita), the presence of Nursehound Nursery using Poseidon R.O.V.(Remote operative vehicule), an underwater drone that can operate up to 120 meters deep with 5 hours of autonomy. The project, partially funded by the Tuscany Region (Go Green 2018), will allow to identify eggs spawning areas. The first 2 years of observations, 2018 and 2019, are presented and discussed
New record of the great white shark Carcharodon carcharias from Lampedusa
Full text linkThis new record confirms that the Central Mediter ranean, and Sicilian coasts in particular, still represent a key area for the population of Mediterranean white
sharks, but also for other shark species (Bilecenoglu et al., 2013); in fact, 43% of all white shark sightings in the Italian seas (Micarelli et al., 2011) are from this area
Maturation and fertilisation in vitro of Pecten maximus oocytes using serotonine and dopamine agonists
No full textMaturation and fertilisation in vitro of Pecten maximus oocytes using serotonine and dopamine agonist
Husbandry of Anthias anthias under natural conditions
Full text linkThe fairy basslet (Anthias anthias) is a fis, with a gregary behaviour, that is found commonly at depths from 30m to 200malong the continental shelf and in caves with coralline seabed. Fifty Anthias specimens were collected by scuba divers and transferred to the Argentario Aquarium (Italy), where a special tank was prepared to host them. The anthias spent 3 days in an acclimation containerat different depths before returning to the surface. The present paper disusses the data concerning the first 24 months of their husbandry under natural conditions
La risposta alla Serotonina iniettata nelle gonadi di esemplari di Pecten jacobaeus pescati nel mare Adriatico
No full textThe possibility of induce spawing of male and female gametes using serotonin has been successfully tested in the scallop, Pecten jacobaeus
Preliminary histological observations of mature gonads in Pecten jacobaeus fished off western Sardinia Item
No full textIn Italy, the studies on Pecten jacobaeus are limited to natural populations present in Adriatic Sea, because of widespread and commercial interest of this species. Brief information on this species, with particular emphasis on diffusion and fishing techniques, are reported by Renzoni (1991). The studies on on its biology and reproductive physiology are limited to the Adriatic area (Valli 1977, 1979). The present study aims to increase current knowledge on the reproductive biology of P.jacobaeus, in the Tyrrhenian sea, looking also the possible aquaculture development of this resource
Notes on a rare case of bluntnose sixgill shark hexanchus griseus stranded on the coast of tuscany in the central tyrrhenian sea [Note su un raro caso di spiaggiamento di capopiatto hexanchus griseus lungo la costa toscana nel mar tirreno centrale]
No full textA rare stranding event involving a 297 cm long mature male bluntnose sixgill shark (Hexanchus griseus) occurred on the Tuscan coast in the central Tyrrhenian Sea. The stranded specimen had 6 rows of teeth indicating that it
belonged to the H. griseus and not to the Hexanchus nakamurai species, which only has 5. Biometric data on two teeth of the left front region of the lower jaw were collected. The body of the specimen did not show evidence of
capture, only a deep cut at the height of the orbital arch suggesting a crash or the ramming of a boat
Prima segnalazione di Fistularia commersonii (Rüppell, 1835) (Fistularidae, Pisces) nel Tirreno settentrionale
No full textNotes on the immigrant fish from the Red Sea belonging to the species Fistularia commersonii (Ruppel,1835) (Fistularidae, Pisces), fished in waters of the North Tyrrhenian Sea. This specimen has been catched from a fishing vessel, along the coast of Monte Argentario (Italy), in october 2004
Application of laser photogrammetry on C. carcharias in natural environment
No full textMost morphometric methods of investigation used on large marine organisms are intrusive, as they involve the capture or the killing of the animal. In the last decade new methods and new technologies have been developed able to supply the same morphometric data avoiding contact with the animal. The result of these efforts was the introduction also in the ecological field of laser photogrammetry. Photogrammetry is a non-invasive remote sensing technique that uses digital photography or images to measure objects or, in the case of animals, morphometry. Laser photogrammetry uses two laser beams, parallel to each other, to obtain the real dimensions of a body starting from a digital image. The objective of the present study is to provide a contribution to the definition and validation of the method for the study of white sharks. Data were collected during XIV° Scientific Expedition in South Africa (2017) managed by Centro Studi Squali and Unical to study the behaviour of Carcharodon carcharias. We proceeded to create a system suitable for the study of the white shark, being careful to the problems highlighted in the literature. The realized instrument was equipped with two filming means, in this way the attention was focused on two aspects: the real effectiveness of laser photogrammetry and the efficiency of using a reflex camera compared to an action-cam. The tool made allowed to obtain valid data. From these, estimates of the total lengths of the samples encountered were obtained by processing the frames considered valid using an appropriately defined protocol. The results obtained by the two imaging systems were compared with each other and with the data derived from the visual estimation (traditionally used not invasive method). The comparison of results allowed some indications regarding the effectiveness of the new morphometric measurement system and its degree of reliability
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