# APPENDIX IV - CALCULATION — INLAND CAPTURE FISHERIES

## INLAND FISHERIES PRODUCTION AT FRESHWATER LANDING PLACES57

Monthly sampling technique is used to analyze catch and value of inland fisheries production from large human-made freshwater bodies, such as dams, and also large freshwater reservoirs. The sampling sites are freshwater landing places of the fishing boats that operate in those reservoirs. The survey is divided into two steps as follows:

1. Survey for number of fishing boats that daily land fish at fishing places; and
2. Analyze the species composition and value of catch from fishing boats that land fish at fishing places by using sampling method.

The equations for analysis are as follows:

 = = When = production landed at fishing places in month h = value of production landed at fishing places in month h Nh = number of total boats at fishing places in month h nh = number to sample boats at fishing places in month h Xhij = catch of species i of sample boat j in month h h = month 1, 2,…, 12 i = species 1, 2,…, m j = sample boat 1, 2,…, n Phij = average price of species i of sample boat j in month h So = = When = total catch of all year = value of total catch all year

## INLAND FISHERIES PRODUCTION FROM FRESHWATER NATURAL RESERVOIRS58

The survey is yearly conducted to obtain the annual catch production of natural reservoirs, in all provinces by sampling technique. The natural reservoirs are divided into three groups as follows:

1. Reservoirs, which are divided into five sub-groups by area, i.e. smaller than 50 rai, 51-100 rai, 101-500 rai, 501-1 000 rai, and larger than 1 000 rai;
2. Natural swamps, which are divided into five sub-groups by area, i.e. smaller than 10 rai, 11-30 rai, 31-50 rai, 51-100 rai, and larger than 100 rai; and
3. Fish barrage, which are divided into five sub-groups by area, i.e. smaller than 10 rai, 11-30 rai, 31-50 rai, 51-100 rai, and larger than 100 rai.

The equations for catch analysis by province are as follows:

 Xhij = When Xhijk = catch of species h, natural reservoir group i, area j, sample reservoir k Xhij = catch of species h, natural reservoir group i, and area j Aij = area of natural reservoir group i, area j aijk = area of sample reservoir k, natural reservoir group i, area j h = species type (1, 2, …, n) i = group of natural reservoirs (1, 2, 3) j = area (1, 2, 3, 4, 5) k = sample reservoir (1, 2,…l, nij)

Then, the catch of all species in each group of natural reservoirs and areas by province is

 Xji =

The catch of all species in all areas of each group of natural reservoirs by province is

 Xi =

The value of species h in natural reservoir group i, area j is

 Vhij =

The value of species h in all areas of natural reservoir group i is

 Vhi =

The value of all species in natural reservoir group i is

 Vhi = When Phij = average price of species h in natural reservoir group i, area j Vhij = value of species h in natural reservoir group i, area j

## Inland fisheries production from pond traps59

The survey is yearly conducted to obtain the annual catch production of pond traps, which are personal or public properties, in all provinces by sampling technique. Pond traps are made for capture fisheries purpose. The one, who wants to harvest the catch production in any pond traps, has to inform the local district office.

The equations for catch, value, and price analysis of each species by province are as follows:

 = When = catch of species j in province i Aij = total area of pond traps, which have production, in province i aij = total area of sample pond traps for species j in province i Xijk = catch of sample pond trap k, species j in province i i = province (i = 1, 2,…, n) j = species (j = 1, 2,…, m) k = sample pond trap (k = 1, 2,…, l) = When = value of species j in province i Aij = total area of pond traps, which have production, in province i aij = total area of sample pond traps for species j in province i Vijk = value of sample pond trap k, species j in province i i = province (i = 1, 2,…, n) j = species (j = 1, 2,…, m) k = sample pond trap (k = 1, 2,…, l) Pij = When Pij = average price of species j in province i Vij = value of species j in province i Qij = catch of species j in province i