Studies on Echo Counting for Estimation Fish Stocks-I

Overlap Counting and Reading of S-type Echo Counter

Abstract

A preliminary consideration and method is presented for calculating the fish abundance index in the S-type echo counter for estimating fish stocks of concentrated fish.
i) The mean density of fish per unit volume of water sampled is: n=4π^r∑^T∑PR¹¹²/P01²(r1-r2)φnpσf
ii) The total quantity of fish distributed around the waters surveyed is: Ns=∑(ni+Δn/2)(r1-r2)Ai
The next paper will deal with the practical application of the above method.