WarcraftPets Forum

Gilnean Raven might be an idea - it's a flyer (so it's strong against water types), and the ability "Nevermore" would put the damper on the Crawdad's Wish ability. (it should be faster in combat)
Also, its second tier abilities are anti-healing, as to reduce the amount healed.

Wish is already a 5 turn cooldown ability, so Nevermore would be wasted on it, unfortunately. Though, Call Darkness and/or Darkflame would be decent counters for the healing done.

Most any moth should be able to do well over 300 damage per round to an aquatic pet. I would assume other flying pets would have a similar damage output. Combine it with a pet that has Call Darkness (or is also flying like the raven), and it should be pretty easy to kill.

Brilliant kaliri with quills and predatory strike. Crawdad is a high HP pet, predatory strike will kill it at ~900 hp (assuming you don't miss or dodge).

Brilliant Kaliri indeed rips to shreds any aquatic 1on1 in no time.

Fluxfire Feline will take him down in 3 rounds

Otherwise, I'd go with a bat or any flying with Reckless Strike to deal him about 500-600 per round

Fluxfire Feline will be a much better addition to any PVP team that any flyer I know though