To get rid of a fishy smell in your house while cooking the fish you can soak the fish in some milk which helps get rid of some of the cause of the odor of the fish.
Or you can also soak the fish in some lemon juice prior to cooking the fish and you should not have the odor of cooking fish in your kitchen when you cook it after soaking it in lemon juice.
Also if possible open a door or window while cooking the fish or if you have a range hood with a fan turn the range hood fan on to help extract the fishy odor from the kitchen while cooking the fish.
After I started soaking the fish in lemon juice the fish odor while cooking the fish has not been so bad.
I also on nice days open my kitchen window or my kitchen door that opens to the outside which lets the fish smell and other cooking smells out and lets fresh air into the kitchen and house.
If you have a lingering fish smell in your kitchen you can use baking soda in an open box to absorb the odors of the fish.
Or even use some coffee grounds which help absorb the fishy odors or any other kitchen odors.