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Titolo:
Assessment of the particulate food supply available for mussel (Mytilus spp.) farming in a semi-enclosed, northern inlet
Autore:
Penney, RW; McKenzie, CH; Mills, TJ;
Indirizzi:
Fisheries & Oceans Canada, St Johns, NF A1C 5X1, Canada Fisheries & OceansCanada St Johns NF Canada A1C 5X1 , NF A1C 5X1, Canada
Titolo Testata:
ESTUARINE COASTAL AND SHELF SCIENCE
fascicolo: 1, volume: 53, anno: 2001,
pagine: 107 - 121
SICI:
0272-7714(200107)53:1<107:AOTPFS>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUSPENSION-FEEDING BIVALVE; EDULIS-L; PLACOPECTEN-MAGELLANICUS; PHYSIOLOGICAL ECOLOGY; COASTAL INLET; GROWTH; SESTON; PHYTOPLANKTON; CULTURE; MOLLUSKS;
Keywords:
seston; particulates; phytoplankton; Mytilus; aquaculture; Newfoundland;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Penney, RW Fisheries & Oceans Canada, POB 5667, St Johns, NF A1C 5X1, Canada Fisheries & Oceans Canada POB 5667 St Johns NF Canada A1C 5X1 a
Citazione:
R.W. Penney et al., "Assessment of the particulate food supply available for mussel (Mytilus spp.) farming in a semi-enclosed, northern inlet", EST COAST S, 53(1), 2001, pp. 107-121

Abstract

Temporal variability in the quantity, organic content, and phytoplankton composition of the particulate food supply available to a cultured mussel population was assessed for a 3-year period in a small inlet of Notre Dame Bay, Newfoundland, Canada. The study site had a restricted flushing rate estimated at 1-2.75 times wk(-1) for a complete water exchange. The quantity ofboth total (TPM) and organic (POM) seston varied temporally from 0.7-23.7 mg l(-1) and 0.05-1.97 mg l(-1) respectively during the 3-year sampling period. TPM typically remained relatively high (> 10 mg l(-1)) through the winter and spring period. Most of the seasonal variation in total seston was due to seasonal variability in the PIM component. Both PIM and POM concentrations were seasonally lowest during summer. The organic fraction of the seston (POM/TPM ratio) was seasonally low in winter and increased steadily through spring and summer to reach its maximum in the autumn. The living phytoplankton component of the seston was typically dominated, both numerically and in biomass, by a variety of diatom and autotrophic nanoflagellate species in the 2-20-mum diameter size range. Discrete diatom population blooms occurred in the autumn of all three years and largely consisted of a single species, Skeletonema costatum. Phytoplankton:detritus ratios were significantly lower during winter. Total phytoplankton biomass levels were seasonally low during winter and summer and were associated with seasonal variation in diatom biomass. We conducted modelling simulations of relationships among seston organic food levels, their temporal variability, tidal flushing rates, cultured mussel biomass and production indices, and estimates of mussel maintenance ration requirements to predict the adequacy of northern inlets to sustain commercial-scale mussel farm development. We conclude from these simulations that small, semi-enclosed, northern inlets likely frequentlyexperience periods when naturally occurring organic seston levels are insufficient to meet basic mussel stock maintenance ration requirements when such inlets are stocked to commercial-scale densities. We infer that periods of food-limited mussel growth and/or production are likely to occur at these high mussel population levels, particularly during summer. Qualitatively poor (low POM:TPM ratio; low phytoplankton:detritus ratio) food supply during winter may also be a further limiting factor. The implications of our conclusions in relation to aquaculture industry development and environmentalmanagement are discussed. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 20:22:13