Certain fish has high levels of mercury that is why you are supposed to avoid it.
Idk why they said no avoid it, its pretty stupid its just food and it actually has some good protine. I ate anything just make sure its cooked well. Nothing raw.
AVOID Eating
Marlin
Orange roughy
Tilefish
Swordfish
Shark
Mackerel (king)
Tuna ( bigeye, Ahi)
High Mercury
Eat no more than three 6-oz servings per month
Sea Bass (Chilean)
Bluefish
Grouper
Mackeral ( Spanish, Gulf)
Tuna (canned, white albacore) See tuna chart below
Tuna ( Yellowfin)
Mercury Levels In Fish: Lower Mercury
Eat no more than six 6-oz servings per month
Bass ( Striped, Black)
Carp
Cod ( Alaskan)
Croaker ( White Pacific)
Halibut ( Pacific and Atlantic) Jacksmelt ( Silverside)
Lobster
Mahi Mahi
Monkfish
Perch (freshwater)
Sablefish
Skate
Snapper
Sea Trout ( Weakfish)
Tuna (canned, chunk light)
Tuna (Skipjack)
Lowest Mercury
Enjoy two 6-oz servings per week
Anchovies
Butterfish
Catfish
Clam
Crab (Domestic)
Crawfish/crayfish
Croaker
Flounder
Haddock
Hake
Herring
Mackeral (N Atlantic, Chub)
Mullet
Oysters
Perch (ocean)
Plaice
Salmon ( Canned, Fresh)
Sardines
Scallops
Shad ( American)
Shrimp
Sole
Squid ( Calamari)
Tilapia
Trout (freshwater)
Whitefish
Whiting