public function applyEffect(Fish &$fish)
 {
     // time goes by, health is going down
     $fish->setHealth($fish->getHealth() - 1);
     $fish->addLifeTick();
     $fish->setHunger($fish->getHunger() + 1);
     $fish->setSleepiness($fish->getSleepiness() + 0.5);
     $fish->setPlayfull($fish->getPlayfull() + 3);
 }
 public function applyEffect(Fish &$fish)
 {
     if ($fish->getPlayfull() >= 8) {
         $fish->setHealth($fish->getHealth() - 1);
     }
 }