ABSTRACT
This study was conducted to validate the Quality Index Method (QIM) scheme and determine storage days on ice for domestically processed Nile perch (Lates niloticus). Samples collected from the fishermen at landing site were used to develop the QIM and for shelf life study at 0ºC to -1ºC for 33 days. Those collected from fish factories and cold stores were used for validation. The study assessed the sensory, microbiological and chemical quality changes of Nile perch on ice. The QIM scheme had the maximum total demerit points score 23 and 24 for gutted and ungutted fish, respectively. The Total Viable Count (TVC) and Specific Spoilage Bacteria (SSB) at the end of storage time (33 days) were 7.64 and 7.36 log10 cfu/g for ungutted and 6.93 and 6.83 log10 cfu/g for the gutted fish, respectively. The TVC and SSB exceeded the limit of acceptability set by Tanzania standards, beyond 14 storage days. Total Volatile Basic Nitrogen (TVBN) value increased slowly with storage time, reaching 11.48 and 12.18 mgN/100g in day 33 of storage for gutted and ungutted fish, respectively. Peroxide values (PV) increased gradually for ungutted Nile perch up to 21 days whereas, rapid increase was observed in gutted Nile perch up to14 days. The Quality Index (QI) scores had a positive correlation (0.91 for TVC, 0.97 for SSB, 0.79 for TVBN) and negative correlation (- 0.40 for FFAs and - 0.33 for PV). There was a significant decrease (p
MASSAWE, E (2021). Development And Validation Of Indices Of Quality Of Lake Victoria Nile Perch (Lates Niloticus) Marketed In Tanzania. Afribary. Retrieved from https://tracking.afribary.com/works/development-and-validation-of-indices-of-quality-of-lake-victoria-nile-perch-lates-niloticus-marketed-in-tanzania
MASSAWE, EMANOELA "Development And Validation Of Indices Of Quality Of Lake Victoria Nile Perch (Lates Niloticus) Marketed In Tanzania" Afribary. Afribary, 11 May. 2021, https://tracking.afribary.com/works/development-and-validation-of-indices-of-quality-of-lake-victoria-nile-perch-lates-niloticus-marketed-in-tanzania. Accessed 22 Dec. 2024.
MASSAWE, EMANOELA . "Development And Validation Of Indices Of Quality Of Lake Victoria Nile Perch (Lates Niloticus) Marketed In Tanzania". Afribary, Afribary, 11 May. 2021. Web. 22 Dec. 2024. < https://tracking.afribary.com/works/development-and-validation-of-indices-of-quality-of-lake-victoria-nile-perch-lates-niloticus-marketed-in-tanzania >.
MASSAWE, EMANOELA . "Development And Validation Of Indices Of Quality Of Lake Victoria Nile Perch (Lates Niloticus) Marketed In Tanzania" Afribary (2021). Accessed December 22, 2024. https://tracking.afribary.com/works/development-and-validation-of-indices-of-quality-of-lake-victoria-nile-perch-lates-niloticus-marketed-in-tanzania