Premium
A Proposed Standard Weight Equation for Blue Suckers
Author(s) -
Neely Ben C.,
Hamel Martin J.,
Steffensen Kirk D.
Publication year - 2008
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/m07-158.1
Subject(s) - percentile , mathematics , quadratic equation , quadratic model , fish <actinopterygii> , metric (unit) , log log plot , statistics , binary logarithm , combinatorics , geometry , biology , fishery , operations management , response surface methodology , economics
Abstract Length and weight data were obtained from 46 populations of blue suckers Cycleptus elongatus ( N = 8,811 fish) across the species' geographic distribution to develop a standard weight ( W s ) equation. The W s equation was derived using the empirical percentile technique applied to fish between 240 and 809 mm total length (TL). We calculated a quadratic model and a linear model to derive W s . The proposed 75th‐percentile quadratic equation (metric units) is log 10 W s = −2.980 + 0.977 log 10 TL + 0.461(log 10 TL) 2 , where W s is expressed in grams and TL is expressed in millimeters. The proposed English‐equivalent 75th‐percentile quadratic equation is log 10 W s = −3.354 + 2.273 log 10 TL + 0.461(log 10 TL) 2 , where W s is expressed in pounds and TL is expressed in inches. The 75th‐percentile linear equation (metric units) is log 10 W s = −6.301 + 3.456 log 10 TL, and the proposed English equivalent is log 10 W s = −4.104 + 3.456 log 10 TL.