var Aquarium = Container.expand(function () {
	var self = Container.call(this);
	this.getWaterBounds = function () {
		var waterGraphics = this.getChildByName('Water Graphics');
		return {
			left: (2048 - waterGraphics.width) / 2,
			right: (2048 + waterGraphics.width) / 2,
			top: (2732 - waterGraphics.height) / 2 - 150,
			bottom: (2732 + waterGraphics.height) / 2 - 150
		};
	};
	var aquariumGraphics = self.createAsset('aquarium', 'Aquarium Background', 0, 0);
	aquariumGraphics.width = 2048 * 1.3;
	aquariumGraphics.height = 2732 * 1.3;
	aquariumGraphics.x = (2048 - aquariumGraphics.width) / 2;
	aquariumGraphics.y = (2732 - aquariumGraphics.height) / 2;
	self.addChild(aquariumGraphics);
	var waterGraphics = self.createAsset('water', 'Water Graphics', 0, 0);
	waterGraphics.width = 2048 / 3 * 2 * 1.2;
	waterGraphics.height = 2732 / 3 * 1.4;
	waterGraphics.x = (2048 - waterGraphics.width) / 2;
	waterGraphics.y = (2732 - waterGraphics.height) / 2 - 150;
	waterGraphics.alpha = 0;
	self.addChild(waterGraphics);
});
var Fish = Container.expand(function () {
	var self = Container.call(this);
	self.getWaterBounds = function () {
		var waterGraphics = LK.getAsset('water', 'Water Graphics', 0, 0);
		return {
			left: (2048 - waterGraphics.width) / 2,
			right: (2048 + waterGraphics.width) / 2,
			top: (2732 - waterGraphics.height) / 2 - 150,
			bottom: (2732 + waterGraphics.height) / 2 - 150
		};
	};
	var fishGraphics = self.createAsset('fish', 'Fish Graphics', .5, .5);
	self.speed = 0.625;
	self.move = function () {
		if (self.targetRotation === undefined || LK.ticks - self.rotationStartTime >= self.rotationDuration) {
			self.targetRotation = Math.random() * Math.PI * 2;
			self.rotationStartTime = LK.ticks;
			self.rotationDuration = Math.random() * 120 + 60;
		}
		var progress = (LK.ticks - self.rotationStartTime) / self.rotationDuration;
		if (progress < 1) {
			var deltaRotation = (self.targetRotation - self.rotation) * progress;
			self.rotation += deltaRotation;
		} else {
			self.rotation = self.targetRotation;
		}
		self.x += Math.cos(self.rotation) * self.speed;
		self.y += Math.sin(self.rotation) * self.speed;
		var waterBounds = self.getWaterBounds();
		if (self.x < waterBounds.left || self.x > waterBounds.right) {
			self.rotation = Math.PI - self.rotation;
		}
		if (self.y < waterBounds.top || self.y > waterBounds.bottom) {
			self.rotation = -self.rotation;
		}
		self.rotation = self.rotation % (Math.PI * 2);
		if (Math.cos(self.rotation) < 0) {
			fishGraphics.scale.x = -1;
		} else {
			fishGraphics.scale.x = 1;
		}
		fishGraphics.rotation = self.rotation;
	};
});
var ClownFish = Container.expand(function () {
	var self = Container.call(this);
	var fishGraphics = self.createAsset('clownFish', 'Clown Fish Graphics', .5, .5);
	self.speed = 0.5;
});
var TangFish = Container.expand(function () {
	var self = Container.call(this);
	var fishGraphics = self.createAsset('tangFish', 'Tang Fish Graphics', .5, .5);
	self.speed = 0.65;
});
var AngelFish = Container.expand(function () {
	var self = Container.call(this);
	var fishGraphics = self.createAsset('angelFish', 'Angel Fish Graphics', .5, .5);
	self.speed = 0.75;
});
ClownFish.prototype = Object.create(Fish.prototype);
ClownFish.prototype.constructor = ClownFish;
TangFish.prototype = Object.create(Fish.prototype);
TangFish.prototype.constructor = TangFish;
AngelFish.prototype = Object.create(Fish.prototype);
AngelFish.prototype.constructor = AngelFish;
var Game = Container.expand(function () {
	var self = Container.call(this);
	var aquarium = self.addChild(new Aquarium());
	LK.stageContainer.setBackgroundColor(0x008080);
	var fishes = [];
	var fishTypes = [Fish, AngelFish, ClownFish, TangFish];
	for (var i = 0; i < fishTypes.length; i++) {
		for (var j = 0; j < 2; j++) {
			var fish = new fishTypes[i]();
			var centerX = 2048 / 2;
			var centerY = 2732 / 2;
			var maxDistance = 600;
			var angle = Math.random() * Math.PI * 2;
			var distance = Math.random() * maxDistance;
			fish.x = centerX + distance * Math.cos(angle);
			fish.y = centerY + distance * Math.sin(angle);
			fishes.push(fish);
			self.addChild(fish);
		}
	}
	LK.on('tick', function () {
		for (var i = 0; i < fishes.length; i++) {
			fishes[i].move();
		}
	});
});

===================================================================
--- original.js
+++ change.js
@@ -78,50 +78,17 @@
 	self.speed = 0.65;
 });
 var AngelFish = Container.expand(function () {
 	var self = Container.call(this);
-	self.getWaterBounds = function () {
-		var waterGraphics = LK.getAsset('water', 'Water Graphics', 0, 0);
-		return {
-			left: (2048 - waterGraphics.width) / 2,
-			right: (2048 + waterGraphics.width) / 2,
-			top: (2732 - waterGraphics.height) / 2 - 150,
-			bottom: (2732 + waterGraphics.height) / 2 - 150
-		};
-	};
 	var fishGraphics = self.createAsset('angelFish', 'Angel Fish Graphics', .5, .5);
 	self.speed = 0.75;
-	self.move = function () {
-		if (self.targetRotation === undefined || LK.ticks - self.rotationStartTime >= self.rotationDuration) {
-			self.targetRotation = Math.random() * Math.PI * 2;
-			self.rotationStartTime = LK.ticks;
-			self.rotationDuration = Math.random() * 180 + 90;
-		}
-		var progress = (LK.ticks - self.rotationStartTime) / self.rotationDuration;
-		if (progress < 1) {
-			var deltaRotation = (self.targetRotation - self.rotation) * progress;
-			self.rotation += deltaRotation;
-		} else {
-			self.rotation = self.targetRotation;
-		}
-		self.x += Math.cos(self.rotation) * self.speed;
-		self.y += Math.sin(self.rotation) * self.speed;
-		var waterBounds = self.getWaterBounds();
-		if (self.x < waterBounds.left || self.x > waterBounds.right) {
-			self.rotation = Math.PI - self.rotation;
-		}
-		if (self.y < waterBounds.top || self.y > waterBounds.bottom) {
-			self.rotation = -self.rotation;
-		}
-		self.rotation = self.rotation % (Math.PI * 2);
-		if (Math.cos(self.rotation) < 0) {
-			fishGraphics.scale.x = -1;
-		} else {
-			fishGraphics.scale.x = 1;
-		}
-		fishGraphics.rotation = self.rotation;
-	};
 });
+ClownFish.prototype = Object.create(Fish.prototype);
+ClownFish.prototype.constructor = ClownFish;
+TangFish.prototype = Object.create(Fish.prototype);
+TangFish.prototype.constructor = TangFish;
+AngelFish.prototype = Object.create(Fish.prototype);
+AngelFish.prototype.constructor = AngelFish;
 var Game = Container.expand(function () {
 	var self = Container.call(this);
 	var aquarium = self.addChild(new Aquarium());
 	LK.stageContainer.setBackgroundColor(0x008080);