Microbiological Studies on the Weakening of Fishing Nets-VIII:The Microbiological Deterioration of Fishing Nets During Storage (3)

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Changes in flora of marine aerobic cellulose-decomposing bacteria occurring in fishing nets during storage after fishing were observed by the following procedure. The samples of fishing nets employed were stored at room temperature (9-15°C) or 30°C for desired periods, under wet condition, after fishing. The relative number of living cells of two main groups of marine aerobic cellulose-decompos-ing bacteria (Cytophaga and true bacteria) occurring in each sample was counted by means of the plating procedure. The results obtained are given in Table 1. Table 1 shows that in fishing nets, under wet condition, the proportion of Cytophagas to the total marine aerobic cellulose-decomposing bacteria increases during storage. At 30°C the relative number of Cytophagas increases more rapidly than at 9-15°C. This result suggests that the marine cellulose-decomposing Cytophagas are more resistant or more adaptable than marine aerobic cellulose-decomposing true bacteria to such storage conditions. It is thought, therefore, that the marine cellulose-decomposing Cytophagas may play the most important role in the deterioration of fishing nets during storage after fishing.
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