Fish Population Dynamic and Stock Assessment (2+1)

Procedure

1. Samples for length frequency should be collected at random from the commercial catches as soon as they are landed.
2. Sampling should be done before sorting into various market size groups
3. Length data should be collected separately for different gears and for different mesh types of the same gear.
4. Length frequency data are to be collected for about 100 specimens once in a month (25specimens in week) for two years covering a wide range of length groups.
5. While collecting data sexes should be treated separately.
6. While recording the length data, total length or fork length or standard length should be taken depending on convenience. The data should be recorded in mm or cm in a primary register.
7. It is better to take the length frequency data for a minimum period of two years(24 months)
8. Classify the individual length recorded into length groups which should not normally exceed twenty five.
9. The weekly data may be pooled on a monthly basis
10. Age and growth data have to be processed using the integrated method of Pauly
11. From the estimated age and growth data, growth parameters can be ascertained.