Development of a Quality Index Method Scheme for Sensory Assessment of Chilled Yellowfin Tuna

Background: Quality monitoring and/or assessment are parts of a freshness/quality control system, which is of utmost importance for fresh seafood, especially Scombridae fish. The quality index method (QIM) is a simple, convenient, unique, and reliable tool to determine the sensory status and estimate the remaining shelf life of aqua products. Objective: This study aimed to develop a QIM scheme for chilled stored yellowfin tuna and apply the protocol in the fish quality evaluation and storage time estimation. Method: Eight gutted yellowfin tuna of 20, 30, and 40 kg up were used in the study. Five panelists participated in the QIM development, training and application. Control and/or validation analyses were sensory assessment by a control sheet, total volatile basic nitrogen (TVB-N) quantification, and total viable count (TVC) determination. Chilled storage of tuna was performed in liquid ice and traditional crushed block ice. Partial least square regression (PLS-R) was conducted on quality index (QI) dataset over storage time to find the regression line and prediction accuracy. Results: The established QIM protocol for gutted yellowfin tuna comprised 6 attributes (namely, color of whole fish, odor of whole fish and flesh, eyes, appearance of whole fish, flesh color and flesh texture) and a maximal QI of 15. The PLS-R showed that QI could be used to estimate the remaining time with a precision of ± 2.0 and 1.4 days for fish stored in slurry ice and crushed ice, respectively. The TVB-N content in the fish flesh maintained below the acceptable level of 25 mg N/100 g throughout the storage period, which made the parameter impractical to detect the fish shelf life. The TVC overreached the allowable level of 107 CFU/g around the time of fish rejection by the sensory method. Conclusion: The developed QIM scheme for yellowfin tuna showed to be more advantageous in detecting fish quality changes compared to the control sensory method and could be used to estimate the fish's remaining shelf life.

ANALISIS PENANGANAN HASIL TANGKAPAN KAPAL PURSE SEINE DI KABUPATEN BANTAENG

The purse seine is the dominant fishing tool at the Birea Fish Landing Base (FLB) which generally catches small pelagic fish. Handling fresh fish is an important part of the chain of the fishing industry. The problem that dominates fishermen and owners is the decline in the quality of fish caught due to fishing time at sea, so that preservation technology is needed that is able to maintain the quality of the fish longer from being caught until landed in the fishing port.The purpose of this study was to analyze the handling and quality of the purse seine fish catch and to analyze the handling and quality of the fish catch after landing from the purse seine ship. This research was conducted on a purse seine vessel in Bantaeng Regency from February to March 2020. Of the five vessels that were the object of research, vessels with better fish quality were vessels that used management with a ratio of 1: 1 meaning 1 kg for 1 kg of fish. The behavior management of fish traders in the market and the travel time from the fish caught to the market are factors that influence the effect of the decline in fish quality.

Farmer Share Analysis of Tuna Fishermen in Gorontalo City, Indonesia

This research was conducted in Tanjung Kramat Village, Hulonthalangi District, Gorontalo City, Gorontalo Province. This study aims to determine the value of tuna fisherman's farmer share and to determine the marketing channels of tuna in Tanjung Kramat Village. The results showed that the marketing channels for tuna fishers in Tanjung Kramat Village were 2 channels. Channel I is Fishermen –CamarLaut Company– Consumer Countries (Singapore, Malaysia, and Japan) channel II Fishermen - collectors - exporters CV. Baris Tuna Anugerah Gorontalo – Consumer Countries (Singapore, Malaysia, and Japan). The value of farmer share in the channel I gets the value of farmer share which is adjusted to the quality criteria of fish, there is quality A getting farmer share as much as 33% while on AC quality there is farmer share as much as 41% and quality C there is farmer share as much as 36% While in channel II the value of farmer share with fishermen to collectors according to the quality of the fish. In quality A, the farmer share value obtained is 90%, AC quality is 82% and C quality is 75%, while the farmer share value for collectors is to CV. Tuna Anugerah line that is adjusted to the quality of the fish. Quality A gets a farmer share value of 30% and AC quality gets 26% and quality C gets a farmer share value of 26%.