Without abstract.

In This study formaldehyde concetration were examined in 5 species of persian Gulf by schryer test . These speciese were "Silver pomfret" (pampus argenus) " brushteeth lizard fish " , (saurdia tubil), "Barred spanish Macerel " (sconbermurus commerson)" sardinella longiceps " and Green tiger shrimp (penaeus semisulcatus) , the rate of formaldehyde concen tration determined in three different temperture storage as 0c , - 20c. -40c. 1 – The results indicated formaldehyde in the Muscle of fish. 2 – The level of formaldeyde concentration obtained in this species have been compared and discussed. 3 – The Flucation in forma dehyde concentration in this species dose not show the same pattern. 4 – Using the schryr test the shelf life for each species were calculated. The longest shelf life were found to be belong to sliver pomfret and shortest to be belong to lizard fish . T.V.N. test in this study as a subsidary contrul test.

Without abstract.