Melhoramento da tenda secadora de Berkel et al. (2005) para o processo da secagem do Ocar (Thryssa spp) capturado na praia de Zalala, província da Zambézia

Abstract

Improvement of any procedure or product is something continuous, where the improved will always lack improvement. The present study had as a general objective to improve the drying tent of Berkel for the drying of the Anchovy (Thryssa spp.) captured in the beach of Zalala, in Quelimane. Anchovies are species of fish of the genus Thryssa that belong to the family Engraulidae that in Quelimane are consumed mostly post preserved by the method of natural drying, this drying which is made in the open sun. For the implementation of the research, first two tents were built, one original of Berkel and other improved of Berkel. The improvement consisted of placing two spars on the ground to ensure that the tent did not fall off against the wind and small holes were made in the air outlet instead of openings that were prone to dust and insect entry. For this, three drying experiments S1, S2 and S3 were made. In these three experiments were simulated three different treatments simultaneously, drying in the open sun (Ta), with the tent of Berkel (Tb) and with the tent improved (Tc). After this, the drying temperature for the three treatments was monitored so with the wind speed of the medium. The results showed that the drying temperature was higher for the improved tent and then for the Berkel tent, registering low in the external environment (maximum temperatures of S1: 40.4 oC, 39.4 oC and 27.5 oC respectively). Test F at 5% significance level showed significant differences (P≤0.05) in the mean average drying temperatures of the external environment compared to the Berkel tent and the improved one. However, there were no significant differences (P≥0.05) in the temperature inside the Berkel tent and the improved in all experiments. The wind speed reached up to 8.3 m/s, but none of the tents collapsed because they were fastened to the ground. In all experiments there was greater moisture loss in the dried fish in the improved stall compared to the other two methods, and secondly the dried fish in the Berkel tent.