Effect of salinity on growth
and survival of king scallop spat (Pecten maximus)
Ian Laing-2002
Aquaculture, 205:(1-2): 171-181
Abstract:
Hatchery-reared king scallop (Pecten maximus
L.) spat were held at a range of salinities (26-30 and 30-35 psu) at
temperatures between 9 and 21 °C. Mean growth rate (as increase in shell
height), food cell clearance rate and condition index (as ratio of dry meat
weight to dry shell weight) were similar in the salinity range 30-35 psu at
all temperatures. Growth rate was significantly lower at 26 psu than at
28-30 psu at 13-21 °C. Food cell clearance rates were always lower at 26
psu than at 30 psu, but the difference was only significant at 13 °C.
Condition index was not affected by salinity in the range 26-30 psu at any
of the temperatures tested. In experiments in which scallop spat were
exposed to low salinity (20-25 psu) for short periods (up to 6 h/day over 3
days) at ambient temperature (7.2-18.7 °C). The subsequent growth rate was
usually significantly lower at 20-psu exposure, and this salinity gave high
mortality in one experiment at 10 °C. Reductions in growth rate were
temporary, and growth recovered to control (ambient salinity) rates within
10 days after exposure.
(The Centre for Environment, Fisheries and
Aquaculture Science, CEFAS Weymouth Laboratory, Barrack Road, The Nothe,
Weymouth, Dorset, DT4 8UB, UK, Tel.: +44-1305-206600; fax: +44-1305-206601,
e-mail: i.laing@cefas.co.uk)