Silver salmon

Rancitelli, L.A., W.A. Haller, and J.A. Cooper. 1968. Trace element variations in silver salmon and king salmon muscle tissue. Rapp. Americain BNWL — 715, Part 2 42-47. 

Wisby, W.J. A.D. Hasler. 1954. The effect of olfactory occlusion on migrating silver salmon (O. kisutch). J. Fish. Res. Board Can. 11 472-478. 

Lesions are characterized by sharply demarcated, erythematous papules and plaques often covered with silver-white fine scales. Initial lesions are usually small papules that enlarge over time and coalesce into plaques. If the fine scale is removed, a salmon-pink lesion is exposed, perhaps with punctate bleeding from prominent dermal capillaries (Auspitz sign). 

Secondly, with one main exception, the silver that has been toned by one of these archival toners is stable and is left unaffected by almost any chemical used subsequently. The one main exception is that when immersed in gold toner, sepia-toned silver does change color towards salmon/orange/red, depending on the paper emulsion and the way the sepia toner is made up. 

Assay Dissolve about 100 mg of sample, accurately weighed, in 20 mL of water add 40.0 mL of 0.1 N ceric sulfate prepared as directed for Volumetric Solutions under Solutions and Indicators (or use a commercially available solution) mix well and add 2 mL of silver sulfate solution (5 g of Ag2S04 dissolved in 95 mL of concentrated sulfuric acid). Cover, heat nearly to boiling, and continue heating for 30 min. Cool to room temperature, and titrate with 0.1 A ferrous ammonium sulfate to a pale yellow color. Add 2 drops of orthophenanthroline TS, and continue the titration to a salmon-colored endpoint, recording the volume required, in milliliters, as S. Perform a residual blank titration (see General Provisions), and record the volume required as B. Each milliliter of the volume B - S is equivalent to 2.650 mg of NaH2P02H20. 

There are more than 450 copper alloys, including brasses, bronzes, copper-nickels, nickel-silvers, and other specialty alloys. Copper is naturally a salmon color and may oxidize or patinate to gradually become dark brown or a greenish blue. Its alloys may range from pink to brown to gold to silver in color. 

The blank value is measured first, since the colour tone obtained is later used as a guide for the sample solution containing cyanide at the end of the titration process. Put 10 ml of 1 m sodium hydroxide solution into a glass beaker, add 20 ml distilled water and 0.1 ml indicator solution, then set the magnetic stirrer in motion. Immerse the tip of the burette in the distilled water solution and release enough silver nitrate solution to cause a change in colour from yellow to yellow-red or salmon-pink. The colouring only remains for a short time. 

Some important freshwater flsh are eels carp tench roach silver bream pike, jackflsh or pickerel perch, pike-perch or blue pike salmon rainbow, river or brown trout and pollan (freshwater herring or white flsh). Unlike sea flsh, the catch of freshwater flsh is of little economic importance (cf Table 13.2), although it does offer an important source of biologically valuable proteins. 

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