Sampling Strategy
This method selects only a small number of units from a group for examination, minimizing time and cost without reducing accuracy.
Sampling method
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
Sampling at each landing site follows this every-other-day rhythm, yielding 10 to 11 surveys per month.
Sampling every 2 days
The basic design of all NSAP forms was adopted from this United Nations agency.
Food and Agriculture Organization (FAO)
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
Under this approach, all observations in the fish population are given the same probability of being sampled.
Random Sampling
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
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
This software program, referenced from Gayanilo et al. 1997, is used to analyze length frequency data.
FISAT
Sub-sampling must always be done this way to determine species composition and collect length frequency data.
By Gear
This is the minimum percentage of landed boats that should ideally be sub-sampled.
10%
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
Every third day in the monthly cycle is a non-sampling day reserved for this activity.
Data checking and form completion
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
If the catch arrives pre-sorted by species or size, borrow sub-samples from each of these groups after weighing them.
Pre-sorted Groups