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More Fishery Management Language, Terms etc..
by Ed Cherry
(from Jersey Coast Anglers Association October 2002 Newsletter)
An F ( mortality value) is given in the plans As perhaps F= 0.28 . What exactly does the value of 0.28 mean in percentage of the stock that is being removed or fished ? The table below will show that approximately 25% of the total stock is being removed by all levels of mortality (reviewed in last months newsletter)
|
= % of mortality |
F= Value |
|
0 |
0 |
|
5 |
.0513 |
|
10 |
.1054 |
|
15 |
.1625 |
|
20 |
.2231 |
|
25 |
.2877 |
|
30 |
.3567 |
|
35 |
.4308 |
|
40 |
.5108 |
|
45 |
.5978 |
|
50 |
.6931 |
|
55 |
.7985 |
|
60 |
.9163 |
|
65 |
1.0498 |
|
70 |
1.2040 |
|
75 |
1.3863 |
|
80 |
1.6094 |
|
85 |
1.8971 |
|
90 |
2.3026 |
|
95 |
2.9957 |
This table should enable you to get an approximate value of what the real numbers of fish ( in percentage) insert “are that” they are referring to in a Fisheries Management Plan(FMP).