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Unlike warm blooded creatures, the growth
period for fish continues during the entire lifetime.
But the high rate of growth until the reproductive
maturity slows down gradually toward the end of life
span. There are both some internal and external factors
influencing the growth process. Some species
genetically grow faster than some others. Fish are cold
blooded creatures, and therefore, ecological
characteristics of the environment they live in have a
direct influence on their growing. For this reason,
growth characteristics of the same fish species living
in various habitats can be different from each other.
For example, growth characteristics of the carp fish
population in
Lake
Beyşehir
are different from those of the carp fish population in
Lake
Nazik
.
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Pearl mullet VB growth curve
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İEven though the pearl mullet cannot be
considered as meaty fish, it is not too small either as
the European anchovy is. According to 2006 figures,
fish caught by professional fishermen have a length of
19.8 cm and a weight of 85 g on the average. The growth
parameters by age groups in terms of average length and
weight as provided by Sarı (2001), and also the growth
formula parameters as provided by von Bertalanffy are
given in the following charts.
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Ages
|
|
I
|
II
|
III
|
IV
|
V
|
VI
|
VII
|
|
Males
|
|
Observed
|
-
|
14,50
|
15,93
|
17,21
|
18,21
|
19,37
|
20,89
|
|
Std.
Deviation
|
-
|
0,22
|
0,11
|
0,07
|
0,11
|
0,21
|
0,29
|
|
Estimated
|
10,40
|
13,42
|
15,70
|
17,43
|
18,74
|
19,73
|
20,49
|
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Annual
Growth
|
10,40
|
3,02
|
2,28
|
1,73
|
1,31
|
0,99
|
0,76
|
|
Annual
Growth, %
|
50,75
|
14,74
|
11,13
|
8,44
|
6,39
|
4,84
|
3,71
|
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Females
|
|
Observed
|
-
|
14,73
|
16,04
|
17,31
|
18,13
|
19,34
|
20,42
|
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Std.
Deviation
|
-
|
0,26
|
0,11
|
0,08
|
0,06
|
0,14
|
0,16
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Estimated
|
10,76
|
13,74
|
15,91
|
17,51
|
18,67
|
19,52
|
20,14
|
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Annual
Growth
|
10,76
|
2,98
|
2,17
|
1,60
|
1,16
|
0,85
|
0,62
|
|
Annual
Growth, %
|
53,43
|
14,80
|
10,77
|
7,94
|
5,76
|
4,22
|
3,08
|
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Total
|
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Observed
|
-
|
14,62
|
15,98
|
17,27
|
18,15
|
19,35
|
20,58
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Std.
Deviation
|
-
|
0,17
|
0,08
|
0,06
|
0,05
|
0,12
|
0,15
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Estimated
|
10,59
|
13,60
|
15,83
|
17,48
|
18,70
|
19,60
|
20,27
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Annual
Growth
|
10,59
|
3,01
|
2,23
|
1,65
|
1,22
|
0,90
|
0,67
|
|
Annual
Growth, %
|
52,24
|
14,85
|
11,00
|
8,14
|
6,02
|
4,44
|
3,31
|
| The
observed and estimated fork length of the pearl
mullet by ages (cm)
(Sarı, 2001). |
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Ages
|
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I
|
II
|
III
|
IV
|
V
|
VI
|
VII
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Males
|
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Observed
|
|
38,41
|
47,46
|
56,17
|
63,44
|
71,94
|
77,13
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Std.
Deviation
|
|
2,21
|
1,23
|
0,81
|
1,27
|
1,41
|
2,44
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Estimated
|
11,38
|
24,43
|
39,15
|
53,56
|
66,57
|
77,71
|
86,92
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Annual
Growth
|
11,38
|
13,05
|
14,72
|
14,41
|
13,01
|
11,14
|
9,22
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Annual
Growth, %
|
13,09
|
15,01
|
16,93
|
16,58
|
14,97
|
12,82
|
10,60
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Females
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Observed
|
-
|
36,53
|
50,187
|
59,25
|
66,19
|
74,75
|
84,73
|
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Std.
Deviation
|
-
|
2,65
|
1,17
|
0,93
|
0,65
|
1,46
|
2,67
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Estimated
|
13,19
|
27,45
|
42,68
|
56,82
|
68,92
|
78,79
|
86,57
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Annual
Growth
|
13,19
|
14,26
|
15,23
|
14,14
|
12,11
|
9,87
|
7,78
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Annual
Growth, %
|
15,24
|
16,47
|
17,59
|
16,33
|
13,99
|
11,40
|
8,98
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Total
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Observed
|
-
|
37,37
|
48,85
|
58,05
|
65,50
|
73,91
|
82,06
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Std.
Deviation
|
-
|
0,17
|
0,85
|
0,66
|
0,58
|
1,12
|
2,00
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Estimated
|
12,06
|
25,54
|
40,25
|
54,18
|
66,33
|
76,42
|
84,50
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Annual
Growth
|
12,06
|
13,48
|
14,71
|
13,93
|
12,15
|
10,08
|
8,08
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Annual
Growth, %
|
14,27
|
15,96
|
17,42
|
16,48
|
14,38
|
11,93
|
9,56
|
| The
observed and estimated total weight of the pearl
mullet by ages (g) (Sarı, 2001). |
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Sex
|
L¥
(cm)
|
K
|
t0
(Yıl)
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Males
|
22,830
|
0,278
|
-1,888
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Females
|
21,838
|
0,313
|
-1,168
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Total
|
22,170
|
0,301
|
-1,158
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| The
estimated seasonal fluctation von Bertalanffy
growth paramaters (L¥-Infinity
length , K-Growth constant, t0
-Theoratical age) |
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