Is Tuna a Fish with Scales

Although many Kosher fish are completely covered with scales, Halacha requires only a minimum number of scales to accord a fish Kosher status (see Y.D. 83:1). Tuna, for example, have very few scales, yet are nevertheless considered a Kosher fish.

Is tuna fish halal in Islam?

Tuna fish is Halal, as all fish are Halal.

Is it cruel to eat tuna?

Tuna fish accumulate toxic mercury in their flesh as a result of industrial pollution, and the side effects of mercury poisoning include finger curling, cognitive impairment, and coordination problems.