Translation Series No.1211

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important constituents of the food, whereas in the Danzig Deep only
Belone played a temporary role.
Table 51. The most important food ingredients as percentaes
of the total food weight (without the unidentifiable mash).
Fishing Months Mean
Food . value
ground IX X XI XII I II III IV V VI simp. weig'd
5
Sprattus
Clup. har.
Belone
Ammodyt.
Gasterost.
Mysideae •
57 67 45 36
10 20 31 29
29 9 16
2 4 11
0 2 8 1
0 0
5 90 97 69 58 76
80 7 2 31 26 14
0 7 2
1 I 1 3 • 1
3 0 2 1
8 0 1 0
6
'
Sprattus
Clup. har.
Belone
Ammodyt.
Gasterost.
Mysideae
•
75
25
8 79
39 2
38 19
8 0
0
54 25
7 11 0
1
73
1 1
91 33
40 29
14 16
IO 16
12 15
2 3
21 18
4
Sprattus
Chip. har.
Ammodyt.
Gasterost.
89 96
9 1
1 2
0
93 93
5 5
2 2
0 0
0 = . .< 0.5 per cent
6.3.3. Differences in dependence on the gear employed
No exact comparison is possible between the weight of the
stomach content of salmon caught with line and that of salmon caught in
nets. There are no data for both kinds of gear corresponding to the same
months and years and the same fiehing grounds. In Fig. 40 have therefore
been inserted the mean value s . for the years of investigation on the fishing
ground 5 (Danzig Deep). According to the curve there are apparent no sub-
stantial differences from October to March. Only beginning in April do the
netted aalmon show a considerably-larger stomach content than the hooked
salmon. However, this result has to be accepted with reservations, because
in March only five and in April only eight" hooked salmon from the Danzig
LID. 341]