The big ones are still out there

Is a big fish like this also a good eating?
Not an authority but the rule of thumb is the larger and older fish the higher the toxin levels.

  • Canned white tuna consists of albacore, a large species of tuna that accumulates moderate amounts of mercury. EDF recommends that both adults and children limit their consumption of canned white tuna to less than once per week.
  • Canned light tuna usually consists of skipjack, a smaller species with approximately one-third the mercury levels of albacore. Most people can safely eat canned light tuna once per week, but EDF recommends that young children (ages 0-6) limit their consumption of canned light tuna to less than once per week.
  • http://seafood.edf.org/common-questions-about-contaminants-seafood
That's a beast.
 
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