TABLE VIIa. DAILY RATES OF BIODEPOSITION IN Crassostrea AND Mytilus
(29-30 October 1968)
Total amounts Total amounts
of biodeposits
of biodeposits
Interval of time
produced
produced in
the daytime
dry wt/12 h
09.00- 12.00- 15.00- 18.00- 21.00- 00.00- 03.00- 06.0012.00 15.00 18.00 21.00 00.00 03.00 06.00 09.00 (18.00-06.00), (06.00-l8.00),
at night
dry wt/12 h
per animal
per animal
Z
5
b
Pseudofaeces(mg) 0.9
1.0
0.4
2.7
2.3
2.0
5.2
2.4
12.2
4.7
R
?
kCrassostrea
Faeces (mg)"
7.2
9.5
8.6
7.1 10.0 15.4 18.4 10.1
50.9
35.4
gigas
Total (mg)
8.1 10.5
9.0
9.8 12.3 17.4 23.6 12.5
63.1
40.1
Mytilus
Faeces (mg)"
5.4
7.8
7.7
8.7
8.5 10.4 16.0
4.7
43.6
25.6
galloprovincialis Pseudofaeces(mg) 1.6
1.2
1.2
1.7
3.3
7.5
5.1
3.0
17.6
7.0
Total (mg)
7.0
9.0
8.9 10.4 11.8 17.9 21.1
7.7
61.2
32.6
a Faeces and pseudofaeces in dry weight (mg)/3 h per animal.