GENERAL LINEAR MODEL (GLM) ANALYSIS OF THE EFFECTS OF PACKAGING MATERIALS AND PRESERVATIVES ON NUTRIENT COMPOSITION OF SMOKED FISH

Abstract

This study aimed at assessing the effect of packaging materials and preservatives on nutrient composition of fish was carried out using 864 live Clarias gariepinus with an average weight of 226g acquired from an earthen pond of a fish farm in Omi-Adio, Ibadan, Nigeria. The experiment was conducted using a 4 × 3 × 11 factorial experiment (4 preservatives, 3 packaging materials and 11 storage periods).  The protein content of the fish decreased consistently from 77.538 (0days after smoking - _DAS) till it reaches 51.253 (140_DAS). The variance of the protein however increases from 1.051 (for 0_DAS) till 25.487 (140_DAS). The moisture content of the fish increases consistently from 5.703 (for 0_DAS) to 24.976 (for 140_DAS). Summary statistics of the packaging materials revealed that mean protein ranged between 59.817±0.94 obtained for the fish packed with basket and 65.897±0.659 (plastics). Highest moisture content of 17.896 (±0.676) was obtained for fish packed with basket while the least moisture content of 13.160 (±0.427) was obtained for fish packed with plastic. All the nutrients returned negative covariates with the protein and the covariates generally ranges between 0.037(cov_xy of ash and crude fibre) and 91.206 (var_x,x of protein). The general linear model analysis of the fish nutrients revealed that there exist significant difference in the protein, moisture content, ash, fat and crude fiber with = 77.40, 460.24, 111.02, 395.77 and 2037.76 respectively.