1,720,992 research outputs found
Novel micellar system for Vitamin D3 oral delivery: Assessment of enteric absorption through a digestion-like in vitro model
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Opportunities and limits of the CFP on the Upper Adriatic coast: applications and operational proposals in support of the fishing sector
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Insediamento di larve di bivalvi su collettori artificiali in unâ€TMarea a barriere artificiali nel Nord Adriatico.
No full textAbstract: From December 2003 to November 2004 a research project on larval settlement of bivalves was carried out in the Northern Adriatic Sea, using some series of collectors (“Chinese cap”) suspended at -2 and -10 m depth. The study revealed the period and density of settlement, as well as the bathymetric preferences of certain species of bivalves. These studies contribute to the knowledge of the distribution of bivalve larvae in the sea environment
Insediamento e reclutamento di Tapes philippinarum.
No full textPREMESSA
Tutte le pratiche di molluschicoltura, e quindi anche l’allevamento della vongola filippina Tapes philippinarum, necessitano del seme, cioè dei giovanili con i quali iniziare il ciclo produttivo. Vongole neo-insediate, al pari di mitili, ostriche e cappesante, possono essere raccolte direttamente in natura (“seme selvatico”) o provenire da impianti di riproduzione controllata (schiuditoi). In genere, il seme frutto di reclutamento naturale garantisce però un maggior successo dell’allevamento, in quanto è già svezzato, geneticamente più forte (maggiore ibridazione), soggetto a minor tasso di mortalità (migliore resa) e costa meno.
Anche in laguna di Venezia le attuali pratiche di allevamento si basano pressoché totalmente sul prelievo di “seme selvatico”, in aree definite “nursery”, dove grazie a condizioni ambientali favorevoli, s’insediano le giovani vongole che poi sono seminate dagli allevatori in spazi acquei in concessione.
I concessionari dei parchi per venericoltura possono, infatti, ottenere l’autorizzazione a raccogliere da aree lagunari prestabilite quantitativi di seme determinati annualmente dalla Provincia di Venezia. A volte l’abbondanza del reclutamento naturale in laguna di Venezia ha consentito ai pescatori di dedicarsi per tempi prolungati quasi esclusivamente alla raccolta del seme, con il fine di venderlo ad altre imprese che esercitano la venericoltura nelle diverse lagune Nord-adriatiche
Insediamento, reclutamento ed accrescimento di bivalvi eduli su strutture in sospensione nellâ€TMarea del campo sperimentale.
No full textABSTRACT - From December 2003 to November 2004 a research project on the larval settlement of bivalves was carried out in the “Campo Sperimentale”. Each sample consisted of two sets of artificial collectors, consisting each of ten “chinese caps”, ten “pegs” and four “bags”, were tied to a suitable surface long-line system and suspended at -2 and -10 m depth. So each sample consisted of 48 collectors. From December 2003 to November 2004 ten samples were plunged and recovered after about a month, and four after three months. The peak of settlement was in spring-summer period, mostly in August for families Mytilidae, Pectinidae and Veneridae, although some families, as Anomidae and Hiatellidae, settled mainly during the winter season. In August some species of worthless Mytilidae, as Modiolarca subpicta (Contraine, 1835) and Modiolula phaseolina (Philippi, 1844), were rather abundant (188 ind/m2/day on “caps” at 10 m), whereas Mytilus galloprovincialis (Lamarck, 1819) settled between April and July with lower abundance values, mainly on “pegs” and “bags” at 2 m depth. Pectinidae species, Chlamys varia (Linnaeus, 1758), Proteopecten glabra (Linnaeus, 1758) and Aequipecten opercularis (Linnaeus, 1758), present during the whole study period, were mostly abundant in summer (up to 267 ind m-2 day-1) and showed a higher settlement on “bags” and “chinese caps” at 10 m depth. Veneridae, mostly Paphia spp., were rather low (max 36 ind/m2/day on “caps” at 2 m). M. galloprovincialis and Veneridae clearly preferred the most surface collectors, whereas Pectinidae preferred the deepest ones. Moreover, in order to define a suitable spat harvesting strategy throughout the different year periods, a calendar of the settlement, which may be useful for the shellfish producers, was assessed
Indicatori economico-ambientali per lo sviluppo sostenibile della pesca in laguna veneta.
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