ABSTRACT - 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.

Insediamento, reclutamento ed accrescimento di bivalvi eduli su strutture in sospensione nell’area del campo sperimentale.

BRESSAN, MONICA;
2006

Abstract

ABSTRACT - 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/1558516
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