Hatchery air cooler
Hatchery header tank
Pumped supply to header
Greenhouse Over reservoir
I
I
I
I
Roof blister
. . . .. 2 . . : ,'I.1- .::. - : : . . . >
7 . ..?. ...
m
7
1
1
T
_.. . _. .:' :. ::..i.. ,..:e.- ., :
. ::. .... ;.I...:: ... .
1 ,
: -7; a r\
- -
Polythene
Incubator
incubator
drain tube
Hatchery
lncu ba tor
Seawater
Tray with
Concrete
Glass
air heater
supply
heater
green algae reservoir wool filter
Scale L
I
I
1
I
I
0
1
2
3
4
5 M
FIG. 6. Closed aea+water oiroulation for "ring plaice : Loweetoft, 1980. (After Shelbourne & d., 1963.)