Squeeze juice from limes and orange and pour over salmon. Sprinkle with salt and pepper, stir well with a spoon and place in the fridge for 30 minutes.
In the meanwhile, dice tomato, avocado, red onion, cilantro and jalapenos and add to another bowl. I liek to remove seeds from one jalapeno for some heat but not too hot, it's up to your taste.
Add diced vegetables to the bowl with salmon, stir and adjust seasonings, if needed. Remember tortilla chips are salty. So I would salt after the taste test with a chip.
Serve cold with chips or on a tostada.
Notes
Store: Refrigerate covered for up to 2 days. Do not freeze.