Fishery statistics
Effective management decisions regarding development or use of fishery resources must be based on adequate statistics. Reliable data on any two of catch, catch-per-unit-of-effort, and effort and on size/age composition of the catch are minimum requirements for assessment leading to rational management policies. Each country should have a statistical system that is efficient and adequate, but also inexpensive and simple. In the Indian Ocean countries studies, there is great variety in the kind an d effectiveness of statistical systems; they fall into six broad categories. Although overall data for a country may be imprecise, there may be data restricted in subject or area that can be of great value. Prescribing interim statistical systems for countries with weak or imprecise systems is not recommended; such systems develop a momentum of their own and are difficult to replace by well-designed systems. The best course is to introduce the long-term system in a pilot model in a selected regi on and then gradually extend it, modifying it as necessary by experience gained in using it. A uniform sampling design is recommended for all countries in the gathering of data so that statistics may be compared. There are two broad approaches in designing a sample survey: one based on fishing unites or boats as the primary sampling unit, the other based on landing centres as primary units. Fieldwork must be closely supervised to make any statistical system function well.
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| Format: | Document biblioteca |
| Language: | English |
| Published: |
FAO ;
1971
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| Online Access: | https://openknowledge.fao.org/handle/20.500.14283/B2357E http://www.fao.org/3/a-b2357e.pdf |
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| Summary: | Effective management decisions regarding development or use of fishery resources must be based on adequate statistics. Reliable data on any two of catch, catch-per-unit-of-effort, and effort and on size/age composition of the catch are minimum requirements for assessment leading to rational management policies. Each country should have a statistical system that is efficient and adequate, but also inexpensive and simple. In the Indian Ocean countries studies, there is great variety in the kind an d effectiveness of statistical systems; they fall into six broad categories. Although overall data for a country may be imprecise, there may be data restricted in subject or area that can be of great value. Prescribing interim statistical systems for countries with weak or imprecise systems is not recommended; such systems develop a momentum of their own and are difficult to replace by well-designed systems. The best course is to introduce the long-term system in a pilot model in a selected regi on and then gradually extend it, modifying it as necessary by experience gained in using it. A uniform sampling design is recommended for all countries in the gathering of data so that statistics may be compared. There are two broad approaches in designing a sample survey: one based on fishing unites or boats as the primary sampling unit, the other based on landing centres as primary units. Fieldwork must be closely supervised to make any statistical system function well. |
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