/**
* Eliminazione elemento da Matrice
* @param FishInterface $fish
* @return null
*/
public function delete(FishInterface $fish)
{
$pos = $this->matrix->search($fish);
if ($pos == null) {
return null;
}
$this->population = $this->copyArrayWithoutFish($fish);
$this->matrix->put(self::OCEAN, $pos);
}
