Sprite kit touch userInteractionEnabled = true

Hi I am trying to set the sprite overlay as water with alpha set to 0.3 and other sprites under the fish but I cant touch the fish as the water sprite swallows touches

from this post [ iOS7 Sprite Kit, how do I disable touching a sprite to make it "scroll"? It says to the subclass SKSpriteNode, so after reading on the subclass, I did this https://www.dropbox.com/s/mt067syvbvkmhjb/newClass.zip?dl=0 I can't see where I am going wrong? any help would be a good greeting

my GameScene.swift

import SpriteKit
class GameScene: SKScene
{
override func didMoveToView(view: SKView)
{
  let fishsprite  = fish(imageNamed: "fish")
    fishsprite.position = CGPoint(x: 512, y:350)
    fishsprite.zPosition = 1
    fishsprite.name = "fish"
    addChild(fishsprite)

    let watersprite  = water(imageNamed: "water")
   watersprite.position = CGPoint(x: 512, y: 360)
   watersprite.zPosition = 3
    watersprite.alpha = 0.3
    watersprite.name = "Water"
    addChild(watersprite)
}

      

        
        
        
      

    

}

my water class

 import SpriteKit
 class water : SKSpriteNode
 {
required init(coder aDecoder: NSCoder)
 {
    fatalError("NSCoding not supported")
}

init(imageNamed: String) {
    let waterTexture = SKTexture(imageNamed: imageNamed)
    super.init(texture: waterTexture, color: nil, size: CGSize(width: 1024, height: 768))
    userInteractionEnabled = false // blocks the touches from everything
   // userInteractionEnabled = true //gets  the touches but stop fish getting them
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    for touch in (touches as! Set<UITouch>)
    {

 //                      let location = touch.locationInNode(scene)
 //                   let touchedNode = nodeAtPoint(location)
 //                      println(touchedNode.zPosition)
 //     

    }
}

    override func touchesMoved(touches: Set<NSObject>, withEvent event:   UIEvent) {
    for touch in (touches as! Set<UITouch>)
    {

    }
}

override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
    for touch in touches
    {

    }
}

      

        
        
        
      

    

}

my fish class

  import Foundation
  import SpriteKit
   class fish : SKSpriteNode
  {
    required init(coder aDecoder: NSCoder) {
    fatalError("NSCoding not supported")
}

init(imageNamed: String)
{
    let fishTexture = SKTexture(imageNamed: imageNamed)
    super.init(texture: fishTexture, color: nil, size: fishTexture.size())
    userInteractionEnabled = true
}

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    for touch in (touches as! Set<UITouch>)
    {
        let location = touch.locationInNode(scene)
        let touchedNode = nodeAtPoint(location)
        println(touchedNode)
        zPosition = 15
        let liftUp = SKAction.scaleTo(1.2, duration: 0.2)
        runAction(liftUp, withKey: "pickup")
        let wiggleIn = SKAction.scaleXTo(1.0, duration: 0.2)
        let wiggleOut = SKAction.scaleXTo(1.2, duration: 0.2)
        let wiggle = SKAction.sequence([wiggleIn, wiggleOut])
        let wiggleRepeat = SKAction.repeatActionForever(wiggle)
        runAction(wiggleRepeat, withKey: "wiggle")
    }
}

override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
    for touch in (touches as! Set<UITouch>)
    {
        let location = touch.locationInNode(scene)
        let touchedNode = nodeAtPoint(location)
        touchedNode.position = location
        touchedNode.zPosition = 15
        println(touchedNode)
    }
}
override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
    for touch in touches
    {
        zPosition = 2
        let dropDown = SKAction.scaleTo(1.0, duration: 0.2)
        runAction(dropDown, withKey: "drop")
        removeActionForKey("wiggle")
    }
}
}