Sodium tripolyphosphate treatment before packaging and freezing of fillets of trap-caught cod (Gadus morhuaL.)in-rigorwas compared with treatment in plain water.The once-frozen treated fillets, evaluated by an analytical taste panel after frozen storage at −12°F (−24.5 °C) for periods up to 27 weeks, had significantly better texture characteristics than did the untreated control fillets.Thaw-drip was significantly smaller in treated samples but this effect was less pronounced after extended frozen storage.Lipid hydrolysis proceeded at the same rate in both treated and untreated fillets.There was no significant difference between the electrophoretic patterns of the proteins found in the treated and untreated samples. In both cases the muscle albumins constituted the major portion of the proteins in the drip.Results indicate that polyphosphate-treated fillets prepared from trap cod could have greater market acceptance than untreated fillets. The producer would benefit from improved quality of product and from increased yield.