Tilapia Substitution

red snapper (flakier texture)
or
flounder
or
sole
or
orange roughy can be substituted for tilapia.

Pompano Substitution

grouper can be substituted for pompano.

Monkfish Substitution

blackfish
or
lobster (more expensive)
or
mahi-mahi (sweeter)
or
red snapper can be substituted for monkfish.

Mahi-mahi Substitution

monkfish (not as sweet)
or
tuna
or
tilefish (flakier texture, not as sweet) can be substituted for mahi-mahi.

Grouper Substitution

striped bass
or
mahi-mahi
or
black sea bass (flakier texture)
or
red snapper (flakier texture) can be substituted for grouper.

Tuna Substitution

swordfish
or
sturgeon
or
halibut
or
salmon can be substituted for tuna.

Sturgeon Substitution

 salmon
or
swordfish
or
halibut
or
tuna
or
whitefish can be substituted for sturgeon.