Egg exemple

using System.Collections;
using UnityEngine;

public class Egg : MonoBehaviour
{
    [SerializeField] Animator animator;
    [SerializeField] Fish fish;

    IEnumerator Start()
    {
        yield return new WaitForSeconds(1200);

        animator.SetTrigger("crack");

        fish.BehaviourActive = true;
        fish.gameObject.transform.SetParent(null);

        yield return new WaitForSeconds(1);

        Destroy(this.gameObject);

        yield return 0;
    }
}