Biology Reference
In-Depth Information
only recorded from October to December; however there were larger numbers in October and
November.
Table 3
.
Number of tucuxi,
Sotalia guianensis
caught with drift gillnets by the artisan
fishing fleet across months and years in the Amazonian Estuary. The data are displayed
by strata (stratum 1 = S1; stratum 2 = S2).
1996
1997
1999
2000
2001
S1
S2
S1
S2
S1
S2
S1
S2
S1
S2
Jan
6
6
23
74
24
60
29
83
Feb
3
5
11
55
23
49
20
27
Mar
4
3
23
120
22
129
25
170
Apr
7
47
19
76
51
109
May
13
47
45
88
32
22
23
45
Jun
Jul
22
46
34
90
Ago
51
230
17
194
Set
29
153
Oct
26
13
83
133
Nov
20
22
45
79
Dec
25
14
65
221
Totals
71
49
13
14
64
296
428
1245
244
806
Table 4. Statistics of fishing trips with and without bycatch of S.
guianensis,
in the
Amazonian estuary between strata (stratum 1= S1; stratum 2 = S2) and between
periods. The two time-periods of whe
n
this study was conducted are labeled as 1 for
1996-1997 and 2 for 1999-2001. Mean (
x
), standard deviation (SD) and sample size (n)
statistics are included.
Fishing Excu
rsion
Fishing Trip with bycatch
Peri
o
d
Total
S1
S2
Total
S1
S2
1
x
2.4
1.3
6.8
7.2
5.3
9.7
SD
6.8
4.6
10.9
10.2
8.3
11.9
n
440
350
90
147
84
63
2
x
3.3
1.2
6.9
5.4
2.6
8.1
SD
5.8
2.1
8.1
6.6
2.3
8.2
n
927
590
337
572
281
291
Table 5. Distribution according to gender and age group of S.
guianensis
in bycatch
collected with drifting gillnets by the artisan fishing fleet of the Amazonian estuary
.
Adult
Young
Calf
Female
Male
Female
Male
Female
Male
To
tal
284
234
71
78
22
14
x
2.5
2.5
2.1
2.0
1.3
1.3
SD
2.3
2.1
2.4
1.9
0.6
0.8
Search WWH ::
Custom Search