Ok, so now my mob doesn't die after a little bit of time, but it doesn't matter if he is in the water or not. Im thinking I could just do this to make it move:  

 

this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setBaseValue(0.5D);

 

and put this under the applyEntityAttributes method. Would that make it actually move or is there something else I have to do? Also what could I do so my fish mob dies on land but not in water? Any help would be appretiated!

Ok so now I edited and switched around a couple things in my entityfishmob class, but now when I spawn the mob, it just flies straight up and never dies. Can anyone help me out?

 

Here is my code:

 

package com.MagZAquaticLifeExperience.common.entity;

import com.MagZAquaticLifeExperience.common.MagzAquaticLifeExperience;

import net.minecraft.block.material.Material;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.passive.EntityWaterMob;
import net.minecraft.init.Items;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;

public class EntityFishMob extends EntityWaterMob {

    private float randomMotionSpeed;
    private float randomMotionVecX;
    private float randomMotionVecY;
    private float randomMotionVecZ;

public EntityFishMob(World par1World) {
	super(par1World);
	 this.setSize(1.0F, 0.5F);
}

protected void applyEntityAttributes() {
	super.applyEntityAttributes();
    this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setBaseValue(200.0D);
}

@Override
    protected boolean canTriggerWalking()
    {
        return false;
    }
    
    @Override
    public boolean isInWater()
    {
        return true;
        //this.worldObj.handleMaterialAcceleration(this.boundingBox.expand(0.0D, -0.6000000238418579D, 0.0D), Material.water, this)
    }
    
    @Override
    public void onLivingUpdate()
    {
        super.onLivingUpdate();
        
        if (this.isInWater()) {
           
           this.randomMotionSpeed = 4.0F;
           this.randomMotionVecX = 1.0F;
           this.randomMotionVecY = 1.0F;
           this.randomMotionVecZ = 1.0F;
           this.worldObj.handleMaterialAcceleration(this.boundingBox.expand(0.0D, -0.6000000238418579D, 0.0D), Material.water, this);
        }else{
        	this.randomMotionSpeed = 0.0F;
            this.randomMotionVecX = 0.0F;
            this.randomMotionVecY = 0.0F;
            this.randomMotionVecZ = 0.0F;
        }
        
        if (!this.worldObj.isRemote)
        {
            this.motionX = (double)(this.randomMotionVecX * this.randomMotionSpeed);
            this.motionY = (double)(this.randomMotionVecY * this.randomMotionSpeed);
            this.motionZ = (double)(this.randomMotionVecZ * this.randomMotionSpeed);
        }
        
        if (!this.worldObj.isRemote)
        {
            this.motionX = 0.0D;
            this.motionY -= 0.08D;
            this.motionY *= 0.9800000190734863D;
            this.motionZ = 0.0D;
        }

    

    }
    
    @Override
    public void moveEntityWithHeading(float par1, float par2)
    {
        this.moveEntity(this.motionX, this.motionY, this.motionZ);
    }


    
    @Override
    protected void updateEntityActionState()
    {
        ++this.entityAge;

        if (this.entityAge > 100)
        {
            this.randomMotionVecX = this.randomMotionVecY = this.randomMotionVecZ = 0.0F;
        }
        else if (this.rand.nextInt(50) == 0 || !this.inWater || this.randomMotionVecX == 0.0F && this.randomMotionVecY == 0.0F && this.randomMotionVecZ == 0.0F)
        {
            float f = this.rand.nextFloat() * (float)Math.PI * 2.0F;
            this.randomMotionVecX = MathHelper.cos(f) * 0.2F;
            this.randomMotionVecY = -0.1F + this.rand.nextFloat() * 0.2F;
            this.randomMotionVecZ = MathHelper.sin(f) * 0.2F;
        }

        this.despawnEntity();
    }
    
    @Override
    public boolean getCanSpawnHere()
    {
        return this.posY > 45.0D && this.posY < 63.0D && super.getCanSpawnHere();
    }
    
    @Override
    protected void dropFewItems(boolean par1, int par2)
    {
        int j = this.rand.nextInt(3 + par2) + 1;

        for (int k = 0; k < j; ++k)
        {
            this.entityDropItem(new ItemStack(MagzAquaticLifeExperience.SaltwaterFish, 1, 0), 0.0F);
        }
    }



protected String getLivingSound() {
	return "";
}

protected String getDeathSound() {
	return "";
}

}

bumparoo 

Anyone?