Here is a list of all the effects:
Regeneration is a positive effect that allows the animal to quickly restore health.
Icefish and Axolotl get x3 regeneration when standing still; The Sunfish gets x2 regeneration near the surface and x3 regeneration at the surface. One of the Humpback's songs makes it regenerate 4x as fast for a few seconds.
The regeneration icon is indicated as a red plus next to the animal.
Speed is a positive effect in which the animal moves faster. With negative values, the animal slows down.
Flying fish enhances its speed when flying; Horseshoe Crab gets 90% speed with boost; Bat applies a slowness on animal in zone of its ray with a boost; Worm and Bobbit worm are faster underground; when Barracuda gets invisible, it losts speed; Jumping above the surface gives dolphin +33% speed each time (stackable 3 times); when Giant Salamander gets invisible, it losts speed; When Frilled shark gets boost, it gradually increases the speed; Colossal squid applies slowness on animal when hit; Thresher shark boosts to shoot 5 whirls backward, which deal damage and slowness; Goblin shark shoots a whizzbang that applies slowness; Cashalot boosts to emit a slow ray that puts a speed debuff on most animals. +15% speed in deeeep; one of Humpback Whale's sings puts slowness on most animals that are close to him; Atlantic Torpedo aura put small slowness.
If any animal swims in whirlpool, it gets -30% speed.
When animal is slow by whirlpool or another animal attack, its health strip becomes
speed debuff in whirlpool
The speed icon looks like this: >>
Strength is a positive effect in which animal will do stronger its next attack.
The strength icon is indicated as a sword.
Bleeding is a negative effect in which animal loses its health and does not naturally heal while bleeding.
When animal has this effect, its health strip becomes
Strangulation is a negative effect in which animal loses its health and oxygen and can only turn and boost.
Anaconda can wrap around animals and give them this effect.
If animal has this effect, its health strip becomes dark yellow.
Electroshock is a negative effect, that gives damage to animals and immobilizing them.
If animal has this effect, its health strip becomes dark yellow, like a Strangulation.
If the animal swims into the Octopus ink, it has got blindness for a certain time.
If animal has this effect, its health strip becomes black.
Poison is a negative effect which players inflicted loses health and are slowed down by 10%.
If animal has this effect, it’s health strip becomes purple.
Anaconda cannot give poison effect, but in cannot be poisoned too.
Coconut crab can charge boost, hit the animal underwater and give this effect.
While this effect animal would sink down and and blow bubbles, but no oxygen loss for aquatic animals or extra oxygen loss for air-breathing animals.
Other air-breathing animals cannot eat these bubbles and regain their oxygen bar, unlike the shipwreck bubbles.