Mechanical spoilage in fresh Nile perch (Lates niloticus) and Nile tilapia (Oreochromis niloticus) at Katosi landing site

Abstract

Fish suffers 50-60% higher postharvest losses (PHFL) compared to other agricultural commodities consequently leading to economic and nutritional losses along the fish value chain. The physical damages have been given less attention especially in the small-scale fisheries. This study was aimed at identifying and quantifying the Nile perch and Nile tilapia post-harvest losses as a result of physical spoilage or damage at Katosi landing site, found on the shores of Lake Victoria Mukono district in Uganda, which was carried out in March and April of 2023. The study collection tools used were the interviews guides, questionnaire and discussion groups. The results revealed that there were two causes of fish physical spoilage which were; use of monofilament net and handling practices. Whereby handling practices (84.6%) accounted for the most damages identified. Handling practices that caused damages were further characterized into two; hauling or picking and onboard handling. Of the two handling practices, onboard handling (35.7%) accounted for the most losses. However, injuries caused by the hooks played a big role in mediating other forms of spoilage like chemical and microbial spoilages. Nile tilapia fishermen experienced the least PHFL compared to Nile perch fishery. Therefore, this calls for a critique assessment and appropriate guidelines on fish handling practices by the fishermen.