Baseline study Fish, fry and commercial fishery Nysted Offshore ...

Bio/consult as Page 39
Number
Number
15
10
5
0
15
10
5
May May
June
Eelpout
Wind farm area Reference area
0
0 10 20 30 40 50
Total length (cm)
Gill net
Fyke net
SEAS. Baseline study – Fish, fry and commercial fishery Dok. nr. 2148-03-001-rev3 2P.doc
June
0 10 20 30 40 50
Total length (cm)
Figure 3.8.12. Length distribution of eelpout in the wind farm area and reference area respectively
May and June.
The fact that the eelpout is viviparous complicated the field examinations by making it
difficult to distinguish a spent individual from an individual in the early development of
the gonads before the stage referred to as intermediate.
Længde
(cm)
K. F.
Wind farm area
Gonadevægt (g)
% Gonadevægt
Gonadeindeks N mean mean mean stdv mean stdv N mean mean mean stdv mean stdv
May Juv. Juvenile gonads 5 13,1 ,42 ,0 ,0 ,0 ,00 6 22,3 ,49 ,0 ,0 ,0 ,00
Male sexual diff. 28 17,8 ,49 ,4 ,4 1,3 ,66 3 16,4 ,42 ,2 ,2 ,8 ,67
intermediary 7 21,3 ,49 1,2 ,9 2,3 ,63 3 23,1 ,44 1,2 ,5 2,1 ,55
Female sexual diff. 19 19,2 ,49 ,4 ,3 1,0 ,46 2 21,2 ,49 ,5 ,4 ,9 ,20
intermediary 10 21,1 ,45 ,6 ,5 1,0 ,42 6 22,4 ,49 ,5 ,3 1,0 ,32
Mature
1 16,0 ,26 1,9 17,8
June Juv. Juvenile gonads 4 8,7 ,39 ,0 ,0 ,0 ,00 4 9,5 ,42 ,0 ,0 ,0 ,00
Male sexual diff. 4 16,0 ,48 ,4 ,1 1,9 ,83 1 22,1 ,40 1,0 2,3
intermediary 6 19,5 ,46 ,6 ,5 2,0 1,22 1 16,0 ,46 ,5 2,6
Female sexual diff. 7 20,0 ,44 ,3 ,3 ,8 ,24 2 22,8 ,50 ,6 ,2 ,9 ,30
Spent
6 19,1 ,49 ,4 ,1 1,1 ,14 1 20,7 ,28 ,1 ,4
Længde
(cm)
K. F.
Reference area
Gonadevægt (g)
% Gonadevægt
Table 3.8.8. Average of length, condition factor, weight and percentage of gonads as a function of
the gonad index for eelpout.