The field of fish genetics is in its infancy in regard to the questions I think you are asking. There is a whole lot more that is unknow than is known. Most of the work I have seen is related to investigating a particular trait or result in a single (or limited) location. I have not heard of or seen anything like a whole LMB (or other species) genome mapping.

Most service providers I am aware of are affiliated with universities, and they work on peer reviewed studies.