REARING OF BIVALVE MOLLUSKS
49
generally more rapid at higher temperatures. A t 30°C larvae began to
set as early as the 7th day after fertilization. Sometimes, the entire
population grown a t this temperature would metamorphose within
la'i(&. 1% Ihfforoii(-tw iu H i w R of 18-tiay-old Iarvtw of Mrreencirda merceruiriu grown
at 10°C (ubovr) wid 30°C (below). Avorago lorlgth of lervao were 105 and 195 fi,
respectively.
5 to 7 days. When grown at 18°C the first metamorphosing individuals
were noticed 16 days after fertilization, although in some cultures this
event did not occur until after 24 days. Other factors, such as quantity
and quality of food, density of larval population, etc., are no doubt
Y
49
generally more rapid at higher temperatures. A t 30°C larvae began to
set as early as the 7th day after fertilization. Sometimes, the entire
population grown a t this temperature would metamorphose within
la'i(&. 1% Ihfforoii(-tw iu H i w R of 18-tiay-old Iarvtw of Mrreencirda merceruiriu grown
at 10°C (ubovr) wid 30°C (below). Avorago lorlgth of lervao were 105 and 195 fi,
respectively.
5 to 7 days. When grown at 18°C the first metamorphosing individuals
were noticed 16 days after fertilization, although in some cultures this
event did not occur until after 24 days. Other factors, such as quantity
and quality of food, density of larval population, etc., are no doubt
Y