Effect of salt concentration on the rehydration capacity of sundried ribbon fish (Trichiurus haumela) stored at ambient (28-330c) and refrigeration (40c) temperature

Abstract

A study was done to investigate the changes in water rehydration capacity of laboratory prepared control dried (dried fish treated without salt), 15% salt dried and 25% salt dried ribbon fish (Trichiurus haumela) stored in polyethene bag at ambient (28-33⁰C) and refrigeration temperature (4⁰C). The main objective of this study was to observe the effect of salt on the rehydration capacity of the dried ribbon fish during 2 months storage period. On the 1st day of storage the reconstitution level of control dried, 15% salt and 25% salt dried fish at 28⁰, 40⁰ and 60⁰C was in the range of 30.05 to 70.98% having maximum value for control dried fish after 60 minute of soaking at 60⁰C and minimum value for 25% salt dried fish after 15 minute of soaking at 28⁰C. The reconstitution capacity of the dried fish products gradually increased with increasing soaking time and temperature. After 60 days of storage the rehydration capacity of dried products at same temperatures of 28⁰, 40⁰ and 60⁰C ranged between 27.16 to 61.43% with highest value for control dried products stored at refrigeration temperature (4⁰C) after soaking for 60 minutes at 60⁰C and lowest value for 25% salt dried fish stored at ambient temperature (28-33⁰C) after soaking for 15 minutes at 28⁰C. Rehydration capacity of the dried products decreased very slowly during storage period due to the slow increment of moisture in the products stored both at ambient and refrigeration temperature. Salt-dried fish absorbed less moisture than that of unsalted dried fish and increased salt concentration resulted in the lower moisture absorption in the dried fish and thus reduced rehydration capacity.

Res. Agric., Livest. Fish.5(1): 107-115, April 2018