Greetings.
First, please pardon me if i say a few words to those who have been a trifle harsh with you.
My impression is that the Japanese are justly renowned for their unfailing courtesy, kindness and helpfulness to all; especially to strangers trying to negotiate the labyrinths of their truly amazing culture.
Would it not be wonderful to perpetuate that well-deserved reputation and help someone who is sincerely trying to resolve a problem? He would long remember the warmth with which he was received and no matter how initially "erroneous" his query might have appeared, some thoughtful research might have suggested paths he could have pursued to find his own directions, wherever they might have led?
As to someone confidently proclaiming THE GOLDEN ratio for THE TERIYAKI sauce, perhaps other opinions also hold even greater weight, e.g. sans any sugar but 2 shoyu : 2 sake : 3 mirin? Chef Saito :
I am not Japanese, but I love Japan, and Japanese culture. I am woefully ignorant in all respects. My English is poor, wordy and labored. Please pardon what I write below which may be totally incorrect. I hope it may provide a tiny glimmer to our friend.
To our experts in Japanese cooking: Non-Japanese might use the term TERIYAKI in a broader sense than native Japanese, just as native Japanese use terms for Italian pasta dishes that could conceivably surprise an Italian purist. Pasta Napolitano with tomato Ketchup?
Many newcomers to Japanese cooking often pick up ideas from "experts" like Elizabeth Andoh. They might use terms like "teriyaki" in a very broad sense, to include glazing sauces used to dress grilled or pan-seared items with a characteristic [ to them] Japanese flavor!
Elizabeth Andoh, if I remember correctly, gives the recipe for a "TARE" base where chicken wings are charcoal-grilled to pick up a smoky flavor and then braised in a dashi-sake-mirin stock [ +/- ginger, scallions] to extract all the rich umami flavors and gelatin.
I think she says that professionals skewer raw chicken parts on soaked bamboo skewers and constantly dip them in this tare base while grilling on charcoal. This keeps enriching the base over time while the skewered meat becomes richly glazed.
I could be totally wrong about everything I have just written, but I suspect that the gentleman seeking information about a teriyaki sauce using chicken or salmon bones may have come across similar ideas and is trying recreate the method.
Red miso is used in Chinese bbq pork marinades to impart a strong umami flavor [ Chinese Cooking Demystified: Char Siu Pork; Youtube] and perhaps could be used with fish/salmon bones, plus sake, etc. to achieve a tare-like base?
Black Cod with White Miso is a dish made famous by Nobu and Chef John at Food Wishes, Youtube has a modified method using white miso, that also could be modified for use with salmon, or white fish trimmings and frames to create a concentrated tare base for grilling or pan cooking?