Global Collection and Handling of Fisheries Data

Sampling Strategy

100

This method selects only a small number of units from a group for examination, minimizing time and cost without reducing accuracy.

Sampling method

200

Under this approach, all observations in the fish population are given the same probability of being sampled.

Random Sampling

300

This is the minimum percentage of landed boats that should ideally be sub-sampled.

10%

Catch and Effort

100

These are the three main points of conversation in a direct interview: total landed catch, type of fishing gear used, and this measure of fishing power exerted.

Fishing effort

200

Trawls are measured in hauls and dragging hours; gillnets in net length and setting hours; hook and line in hooks, sets, and this.

Soaking time

300

This data-collection method, where boats keep their own navigation and fishing records, is effective for large-scale commercial boats like purse seiners.

Logbook survey

NSAP Schedule

100

Sampling at each landing site follows this every-other-day rhythm, yielding 10 to 11 surveys per month.

Sampling every 2 days

200

Boats above 3 gross tons are monitored at commercial landing sites; municipal landing sites handle boats of this size or less.

3 gross tons or less

300

Every third day in the monthly cycle is a non-sampling day reserved for this activity.

Data checking and form completion

Handling the Data

100

The basic design of all NSAP forms was adopted from this United Nations agency.

Food and Agriculture Organization (FAO)

200

This software program, referenced from Gayanilo et al. 1997, is used to analyze length frequency data.

FISAT

300

Catches from different gears must never be mixed for this reason, related to the sizes of fish each gear removes from the stock.

Gear Selectivity

Sub-sampling Secrets

100

Random samples should be taken from the top and bottom of the container because large fish are sometimes selectively placed here, with small fish most often hidden here.

Bottom of the container

200

Sub-sampling must always be done this way to determine species composition and collect length frequency data.

By Gear

300

If the catch arrives pre-sorted by species or size, borrow sub-samples from each of these groups after weighing them.

Pre-sorted Groups