258
15.4.2 System Requirements and Management
Artificial substrates with egg clusters are transferred to hatch in fibreglass tanks
of 50-L capacity containing 40-L filtered seawater. Two pieces of longitudinal-cut
PVC pipe (25-mm diameter, 400-mm length) equipped with aeration devices are
placed in each tank, facing in the same direction, to generate and direct an artificial
current (Fig. 15.5). Tanks are cleaned by siphoning out the old water and replaced
by a volume of 50 %. Temperature change is minimised by means of outside running
water around the tank base (Nabhitabhata et al. 2005). The average temperature
Fig. 15.4 Hatchling of
Euprymna hyllebergi (dorsum, 17x). (Photograph of J
Nabhitabhata)
Fig. 15.3 Egg capsule of
Euprymna hyllebergi; surface
is colored brown by attached
diatoms (40x). (Photograph
of J Nabhitabhata)
J. Nabhitabhata and M. K. Nishiguchi
15.4.2 System Requirements and Management
Artificial substrates with egg clusters are transferred to hatch in fibreglass tanks
of 50-L capacity containing 40-L filtered seawater. Two pieces of longitudinal-cut
PVC pipe (25-mm diameter, 400-mm length) equipped with aeration devices are
placed in each tank, facing in the same direction, to generate and direct an artificial
current (Fig. 15.5). Tanks are cleaned by siphoning out the old water and replaced
by a volume of 50 %. Temperature change is minimised by means of outside running
water around the tank base (Nabhitabhata et al. 2005). The average temperature
Fig. 15.4 Hatchling of
Euprymna hyllebergi (dorsum, 17x). (Photograph of J
Nabhitabhata)
Fig. 15.3 Egg capsule of
Euprymna hyllebergi; surface
is colored brown by attached
diatoms (40x). (Photograph
of J Nabhitabhata)
J. Nabhitabhata and M. K. Nishiguchi