MATERIALS AND METHODS
Each set of egg jars consisted of five jars, each of which had an internal
diameter of 10.5 cm (4 in PVC pipe) and was 38 cm tall, mounted on a
151
Aquaculmral Engineering 0144-8609/87/S03.50--© Elsevier Applied Science
Publishers ltd. England. 1987. Printed in Great Britain
152 M. G. Poxton, K. R. Murray
VIEW
In
END
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8L
38cm
t
~..-10.5 crn-
Lid
Outlet
Gutter
.Funnel
~ . B a s e
Inlet
Stand
Fig. 1. The salmon egg incubation jars.
base plate of 10 mm PVC sheet (Fig. 1). A 1.2 cm outlet (0.5 in) was
situated just below the top of the jars which therefore had a working
volume of approximately 2.5 litres of eggs. Water was supplied to the
base of each jar through a half section of 4 cm ( 1.5 in) pipe and flowed
through four 5 mm holes upwards through the eggs and out of the top
into a gutter. Inside the jars the eggs were supported on a cut down
perforated filter funnel located on a PVC plug in the centre of each jar.
As constructed each set of jars used £ 14 of materials ( 1980 prices).