Spawner

using UnityEngine;
using System.Collections;
using System;

public class Spawner : MonoBehaviour {

    public GameObject Bubble;
    GameObject _Bubble;
    public GameObject Fish;
    public GameObject BlueFish;
    public GameObject GoldFish;
    public GameObject Shark;

    public static bool doSpawn = true;
    public static bool doSpawnFish = true;
    public static bool doSpawnBlueFish = true;
    public static bool doSpawnGoldFish = true;
    public static bool doSpawnShark = true;

    float spawnSpeed = 0.25F;

    void Update()
    {
        if(!MainGlobals.isGameOver)
        {
            if (doSpawn)
            {
                StartCoroutine(spawnBubbles());
            }

            if (doSpawnFish)
            {
                StartCoroutine(spawnFishes());
            }

            if (doSpawnBlueFish)
            {
                StartCoroutine(spawnBlueFishes());
            }

            if (doSpawnGoldFish)
            {
                StartCoroutine(spawnGoldFishes());
            }

            if (doSpawnShark)
            {
                StartCoroutine(spawnSharks());
            }
        }
    }

    IEnumerator spawnBubbles()
    {
        doSpawn = false;
        yield return new WaitForSeconds(spawnSpeed);
        spawnBubble();
        doSpawn = true;
    }

    IEnumerator spawnFishes()
    {
        doSpawnFish = false;
        yield return new WaitForSeconds(UnityEngine.Random.Range(3, 7));
        spawnFish();
        doSpawnFish = true;
    }

    IEnumerator spawnBlueFishes()
    {
        doSpawnBlueFish = false;
        yield return new WaitForSeconds(UnityEngine.Random.Range(8, 15));
        spawnBlueFish();
        doSpawnBlueFish = true;
    }

    IEnumerator spawnGoldFishes()
    {
        doSpawnGoldFish = false;
        yield return new WaitForSeconds(UnityEngine.Random.Range(8, 15));
        spawnGoldFish();
        doSpawnGoldFish = true;
    }

    IEnumerator spawnSharks()
    {
        doSpawnShark = false;
        yield return new WaitForSeconds(UnityEngine.Random.Range(8, 15));
        spawnShark();
        doSpawnShark = true;
    }

    public GameObject spawnBubble()
    {
        Vector3 pos = new Vector3(UnityEngine.Random.Range(-3.0F, 3.0F), -6.5F, -5);
        _Bubble = (GameObject)Instantiate(Bubble, pos, Quaternion.identity);
        float bubbleSize = UnityEngine.Random.Range(1.0F, 1.5F);
        _Bubble.transform.localScale = new Vector3(bubbleSize, bubbleSize, _Bubble.transform.localScale.z);
        _Bubble.transform.tag = "bubble";
        return _Bubble;
    }

    public void spawnFish()
    {
        if(_Bubble.transform.childCount <= 0)
        {
            spawnFishes(Fish);
        }
    }

    public void spawnBlueFish()
    {
        if (_Bubble.transform.childCount <= 0)
        {
            spawnFishes(BlueFish);
        }
    }

    public void spawnGoldFish()
    {
        if (_Bubble.transform.childCount <= 0)
        {
            spawnFishes(GoldFish);
        }
    }

    public void spawnShark()
    {
        if (_Bubble.transform.childCount <= 0)
        {
            spawnFishes(Shark);
        }
    }

    public void spawnFishes(GameObject fishType)
    {
        GameObject newFish = (GameObject)Instantiate(fishType, _Bubble.transform.position, Quaternion.identity);
        newFish.transform.SetParent(_Bubble.transform);
        _Bubble.GetComponent<Rigidbody2D>().gravityScale = UnityEngine.Random.Range(-0.03F, -0.5F); ;
        newFish.transform.localScale = _Bubble.transform.localScale / 2;
        if (newFish.transform.position.x > 0)
        {
            newFish.transform.rotation = Quaternion.Euler(0, 180, 0);
        }
        newFish.transform.Rotate(0.0f, 0.0f, UnityEngine.Random.Range(-45.0f, 45.0f));
    }
}