REARING OF BIVALVE MOLLUSKS
13
hand, the temperature exceeds that indicated by the thermostat, the
solenoid valve in the cold water line opens, allowing circulating cold
water to reduce the tank temperature. To have the entire mass of
water at uniform temperature a circulator pump is employed. The
temperature controls of the entire unit are so arranged that all tanks
may be maintained a t the same temperature, within the range from
5" to 37°C or, if necessary, at different temperatures.
Fro. 0, Tompertrturo rtppnratus for rirnahtnour r t u d h of c:ortairi wrpmb of bsturvlor
of juvonihi rnoll~inkn in rtinnii~~ wutor of clifTorenb but oonstnnt tomperaturn.
A, wwnp t i a h for tLir trrppod in nea wator linen; B, oold and warm water constant
Ifivcil jaw tiwin wlrinti wutor in diffnrtlnt proportions enters mixing jam (C). Ewh
jrrr i m y Iw nisic~lainod nt any teinportrtwt ranging from 6" (in winter) to 35OC;
D, ultfrHvirdtrtl mi& thi-ougti whirli all norr wetor peeeee t o corinhnt level jam;
E, conntant love1 jars from whirli phytoplankton ia added at a definite rate to
running sea water ; F, floats controlling levels in constant level jam.
To control the temperature of the air chambers in which culture
vessels are kept in some experiments thermostatically-controlled eleotric heaters are used. For example, in experiments, where a sories of
four banks of five trayu each of standing water are umd to hold juvenilo
clams, a uniform constant temperature ie maintaincd by encloNing ail
twenty trays in a chamber where thcrmo~tatically-controlled c!lectrio
heaters are installed (Fig. 8). When heated air is uwd, however,
13
hand, the temperature exceeds that indicated by the thermostat, the
solenoid valve in the cold water line opens, allowing circulating cold
water to reduce the tank temperature. To have the entire mass of
water at uniform temperature a circulator pump is employed. The
temperature controls of the entire unit are so arranged that all tanks
may be maintained a t the same temperature, within the range from
5" to 37°C or, if necessary, at different temperatures.
Fro. 0, Tompertrturo rtppnratus for rirnahtnour r t u d h of c:ortairi wrpmb of bsturvlor
of juvonihi rnoll~inkn in rtinnii~~ wutor of clifTorenb but oonstnnt tomperaturn.
A, wwnp t i a h for tLir trrppod in nea wator linen; B, oold and warm water constant
Ifivcil jaw tiwin wlrinti wutor in diffnrtlnt proportions enters mixing jam (C). Ewh
jrrr i m y Iw nisic~lainod nt any teinportrtwt ranging from 6" (in winter) to 35OC;
D, ultfrHvirdtrtl mi& thi-ougti whirli all norr wetor peeeee t o corinhnt level jam;
E, conntant love1 jars from whirli phytoplankton ia added at a definite rate to
running sea water ; F, floats controlling levels in constant level jam.
To control the temperature of the air chambers in which culture
vessels are kept in some experiments thermostatically-controlled eleotric heaters are used. For example, in experiments, where a sories of
four banks of five trayu each of standing water are umd to hold juvenilo
clams, a uniform constant temperature ie maintaincd by encloNing ail
twenty trays in a chamber where thcrmo~tatically-controlled c!lectrio
heaters are installed (Fig. 8). When heated air is uwd, however,