Fish is an important part of one’s diet in most cultures. Fish is a good and inexpensive source of protein and omega 3 fatty acids. Oily fish like salmon, tuna, trout, carp and hilsa contain a lot of omega 3 fatty acids and DHA that are important for brain development. However, the recommended serving of oily fish is 2 servings per week to prevent health risks from pollutants. The other category of fish called white fish (cod, haddock etc) or fresh water fish (catfish, tilapia, pomfret etc) have less omega 3 fatty acids but are good source of proteins and have less chances of associated risks from pollution http://www.weightlossresources.co.uk/diet/healthy_eating/oily_fish.htm
Here is a list of some common fish that are part of South Asian, Indian and Chinese cuisine and readily available in groceries in the Phoenix area. I have also included their local names so that they are easily recognizable in the grocery aisles. For a list of common Bengali fish names refer to https://en.wikipedia.org/wiki/List_of_fishes_in_Bangladesh
1. Rohu (Labeo rohita; commonly called Rui): This fish is a staple in Bengali cuisine from India and Bangladesh. It is imported from Bangladesh and available frozen in Bangladeshi groceries like I-Mart in Chandler, Deshi Plaza in Tempe etc.
2. Grass Carp (Ctenopharyngodon idella; commonly called grass carp): This fish is an import from China and is readily available in lakes and ponds around Phoenix. It tastes just like Indian carp (Rohu). It is available fresh in Lee Lee Oriental Supermart in Chandler, Mekong Market in Mesa, 99 Ranch Market in Phoenix etc.
3. Big head carp (Catla catla; commonly called Katla): Another freshwater fish of carp family that is imported from Bangladesh. Available in I-Mart in Chandler, Deshi Plaza in Tempe and Lee Lee Oriental Supermart in Chandler.
4. Bigmouth buffalo (Ictiobus cyprinellus; commonly called Buffalo fish): Its availability is seasonal and available in Lee Lee Oriental Supermart in Chandler.
5. Wallago (Wallago attu; commonly called Boal): It is imported from Bangladesh and available in I-Mart in Chandler.
6. Featherback fish (Chitala chitala; commonly called Chital): It is available in Lee Lee Oriental supermart and I-Mart in Chandler. I-Mart also has the minced fish to make fish cutlets (chital macher muitha)
7. Hilsa (Tenualosa ilisha; commonly called Ilish): It is a Bengali specialty and available in I-mart in Chandler and Deshi Plaza in Tempe.
8. Tilapia (Oreochromis mossambicus; commonly called tilapia): Live tilapia is available in Lee Lee oriental supermart in Chandler. Refrigerated varieties can be bought from Mekong Market in Mesa and tilapia fillets are available in Fry’s, Bashas, Costco etc.
9. Pomfret (Brama brama; commonly called pomfret): Available in all Asian groceries like Lee Lee Oriental Supermart in Chandler, Mekong Market in Mesa, 99 Ranch Market in Phoenix etc.
10. Silver sheat fish (Ompok pabo; common name pabda): It is a type of catfish and available frozen in I-Mart and Lee Lee Oriental Supermart both in Chandler.
Some other varieties like puti, chapila, tengra, bata, mrigal etc are also available frozen in I-Mart. You can visit the store at 928, N Alma School Road, Chandler.