. Commercial fisheries review. Fisheries; Fish trade. January 1958 COMMERCIAL FISHERIES REVIEW EXPERIMENTAL PROCEDURE The analyses, both for sodium and potassium, were made with a direct-reading flame photometer. The procedure employed was adapted from one used by the National Canners Associa- tion (1956). Details of the analyses were as follows: \ ' ^^^SSHS^S^^HT? ^^ 1. Partially thaw a c an of frozen sample in luke- warm water for 30 minutes, and then open can. 2. Transfer a 10-gram portion of the sample to a porcelain evaporating dish, 3. Divide the sample into fine particles by cutting it
. Commercial fisheries review. Fisheries; Fish trade. January 1958 COMMERCIAL FISHERIES REVIEW EXPERIMENTAL PROCEDURE The analyses, both for sodium and potassium, were made with a direct-reading flame photometer. The procedure employed was adapted from one used by the National Canners Associa- tion (1956). Details of the analyses were as follows: \ ' ^^^SSHS^S^^HT? ^^ 1. Partially thaw a c an of frozen sample in luke- warm water for 30 minutes, and then open can. 2. Transfer a 10-gram portion of the sample to a porcelain evaporating dish, 3. Divide the sample into fine particles by cutting it with a shears; remove any particles of bone, scale, or skin that maybe present. 4. Tare two porcelain crucibles, and weigh a 4- gram sample into each one. 5. Using an electric hot plate, carefully char the samples. 6. Transfer the crucibles to an electric furnace at 550 for as long as 24 hours if the ash remains FIG. 2 - USING FLAME PHOTOMETER TO DETERN SODIUM AND POTASSIUM IN FISH. \TURAL CONTENT OF C: heat for 4 hours or Table 1 - Analyses of Salt-Water Fish 1 Series No of Common Name Scientific Name Place of Capture Fish in Ash Sodium tioniy Sample %'^ Germo alalunga Washington coast 6 Tie 3U 293 " 334 S Pollock Spanish mackerel (Atlantic) Atlantic coast I 3 48 43 55 236 Scomberomorus maculatus d Halibut Hippogiossus stenolepia Alaska coast 10 1,50 53 60 379 Shad Aloaa sapidissuna Chesapeake area 5 54 62 I YeliowtaLl flounder Limanda ferruginea Fippines Ledgp \ L07 59 67 366 CynoBCion regalia Melanogrammus aeglefinua I Ling cod Fippines Ledge Washington coast \ 62 71 352 347 401 Ophiodon elongatus i (i) Sebastodes tlavidus Washington coast 6 50 57 408 b Porgy (or acup) Stenotomus chrysops Atlantic coast 4 63 72 287 327 Whiting Fippines Ledge 65 Whiting Merlucclus bilinearia 3 a Red rockfiah Sebastodes ruberrimus Washington coast 6 66 75 b Sea bass (Atlantic) Sebaatodes melanops Washington coast ^ 68 78 432 256 492 b Re
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