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Off‐Flavor in Channel Catfish from Commercial Ponds
Author(s) -
Brown Steven W.,
Boyd Claude E.
Publication year - 1982
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1982)111<379:oiccfc>2.0.co;2
Subject(s) - ictalurus , catfish , hectare , flavor , zoology , biology , fishery , manure , chlorophyll a , fish <actinopterygii> , agronomy , ecology , botany , food science , agriculture
Channel catfish Ictalurus punctatus from 13 ponds with low feeding rates (<40 kg/hectare per day) and 10 ponds with high feeding rates (>50 kg/hectare per day) in west‐central Alabama had discernable off‐flavor, as determined by sensory evaluation. However, off‐flavor became more intense (causing lower sensory scores) as maximum daily feeding rate increased (r = −0.66; P < 0.01). Six ponds with low feeding rates were in pastures for intensive dairy farming, and considerable manure reached these ponds. When these ponds were omitted, the correlation increased (r = −0.75; P < 0.01). Although correlations between chlorophyll α or chemical oxygen demand (COD) concentrations and off‐flavor scores were not significant (P > 0.05), ponds with the lowest concentrations of chlorophyll α and COD had the best tasting fish. The blue‐green alga Lyngbya sp. was abundant in several ponds where fish had extreme off‐flavor.