2024-03-28T16:16:47Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/607382019-09-25T10:13:17Zcom_10261_47com_10261_8col_10261_300
The physiological energetics of mussels (Mytilus galloprovincialis Lmk) from different cultivation rafts in the Ria de Arosa (Galicia, N.W. Spain)
Navarro, Enrique
Iglesias, J. I. P.
Pérez-Camacho, A.
Labarta, Uxío
Beiras, Ricardo
16 páginas, 3 figuras, 5 tablas
Physiological components of growth (clearance and ingestion rates, absorption efficiencies and
metabolic rates) were determined in specimens of mussels (Mytilus gafloprovincialis) from several
cultivation rafts in the Ria de Arosa (Galicia, Spain). Choice of raft location within the estuary was
intended to provide an oceanic-terrestrial gradient of conditions. Experiments were performed directly
on the raft, under natural conditions of food availability. Water was pumped to feeding trays
from two different points (front and back) to account for the variability in seston concentration
associated with the filtering activity of the hanging culture.
Food concentration was found to be highly variable (0.35 to I .O 1 mg POM l- ’ ), the main differences
being accounted for by site characteristics. Conversely, food quality (here defined as mg POM
per mm3 of packed particles) experienced minor variations (0.59 to 0.7 I ), with the sole exception of
the innermost site studied (quality 0.43). Absorption efficiencies were clearly dependent on food
quality and could be adequately modelled as an exponential function of that variable.
The scope for growth (SFG) measured at the front of the raft was consistently higher than at the
back and confirmed empirical evidence on growth rates. This result does not merely reflect improved
feeding conditions in the input area but associated effects of increased clearance rates and absorption
efficiencies exhibited by mussels from the front of the raft. On the other hand, raft positioning within
the estuary appears to induce noticeable differences in the feeding behaviour of mussels, as evidenced
by higher clearance rates determined in more oceanic areas.
2012-11-21T11:03:49Z
2012-11-21T11:03:49Z
1991
artículo
Aquaculture 94(2-3): 197-212 (1991)
0044-8486
http://hdl.handle.net/10261/60738
10.1016/0044-8486(91)90118-Q
eng
http://dx.doi.org/10.1016/0044-8486(91)90118-Q
closedAccess
Elsevier