All Chinook Salmon as stated.
Brown Trout has black spots with white halos around these spots. Usually, there are red spots with white halos as well, but sometimes, these red spots are absent in lake run fish. The anal fin of the Brown Trout is also much shorter and more triangular in shape.
As for consumption, there are two factors:
1) Chinook Salmon in Lake Ontario is fit for consumption, but very restricted. Chinook Salmon less than 30" long should be consumed no more than twice a month. Each meal consists of an 8oz portion with skin and fat removed (belly fat, fat around fins, dark meat on lateral line). If you do not remove the fat, it is even more restrictive as the contamination is stored in the fatty tissue (PCBs). Women of child bearing age and children under 15 should NOT eat any salmon from Lake Ontario.
Check the link below for consumption guidelines for the Credit River. The guide is published by Ministry of Environment and Climate Change. The data is usually updated every 2-5 years. Usually waterbodies that are more popular and closer to population centers are sampled more frequently.
https://www.ontario....ory?id=43357943
2) Chinook Salmon die after spawning. When they near spawning condition, their flesh is already degrading. Since they do not feed intensively in the river as they do in the lake, the energy that is needed to support the upstream migration and nest building is derived from the nutrient stored in the muscle. As more and more energy is used, the muscles degrade until the fish starts to decay. Some anglers jokingly call these fish "zombies" because the fish is left in a half dead state where the mind is still somewhat functioning but the body decays (often with skin and flesh hanging off the body).
All three of your fish are not considered fit for consumption. The first hen is clearly spawned out with an empty abdomen. The second male has small white areas on the belly and anal fin suggesting wounds from spawning activity is infected, not healed and rotting away. The skin under the jaw and on gill plate has also fallen off. The last hen has worn out tail from spawning with the skin and flesh turning white. She also looks spawned out as the abdomen is very empty.
The only Chinook Salmon I would eat now are 1) 3lb or under fish caught trolling in Lake Ontario (commonly called "shakers") or 2) small migrating males around 2-3lbs (commonly called "jacks") that are silver indicating that these fish are recent arrival from the lake with very little time spent in the river.