Ummm... I have a very funny and strange glitch, could someone help?

Basically, my program has a bunch of A.I. fish move around and eat each other. However, instead of eating on contact, they eat constantly, causing some fish to teleport all around and the other to grow constantly. I think the problem is in the eating code, here:
Code:

//check for fish within an area, and chase/run away
    if(ident!=1) {
	if((x+sizex<=fish1.sizex+fish1.x+50 || x>=fish1.x-50) && (y+sizey<=fish1.sizey+fish1.y ||y>=fish1.y)) {
	  if(sizex*sizey>fish1.sizex*fish1.sizey+30) {
	    if(isChasing=false) {
		chase=random(.5,1.5);
		xmov=chase*fish1.xmov;
		ymov=chase*fish1.xmov;
		isChasing=true;
	    }
	  stopChasing=true;
	  }
	}
	if(sizex*sizey<fish1.sizex*fish1.sizey-30) {
	  if(x>fish1.x && xmov<0 || x<fish1.x && xmov>0) {
	    xmov=-1.2*xmov;
	    ymov=-1.2*ymov;
	  } else {
	    xmov=xmov*1.2;
	    ymov=ymov*1.2;
	  }
	}
    }
    if(ident!=2) {
	if((x+sizex<=fish2.sizex+fish2.x+50 || x>=fish2.x-50) && (y+sizey<=fish2.sizey+fish2.y ||y>=fish2.y)) {
	  if(sizex*sizey>fish2.sizex*fish2.sizey+30) {
	    if(isChasing=false) {
		chase=random(.5,1.5);
		xmov=chase*fish2.xmov;
		ymov=chase*fish2.xmov;
		isChasing=true;
	    }
	    stopChasing=true;
	  }
	  if(sizex*sizey<fish2.sizex*fish2.sizey-30) {
	    if(x>fish2.x && xmov<0 || x<fish2.x && xmov>0) {
		xmov=-1.2*xmov;
		ymov=-1.2*ymov;
	    } else {
		xmov=xmov*1.2;
		ymov=ymov*1.2;
	    }
	  }
	}
    }
    if(ident!=3) {
	if((x+sizex<=fish3.sizex+fish3.x+50 || x>=fish3.x-50) && (y+sizey<=fish3.sizey+fish3.y ||y>=fish3.y)) {
	  if(sizex*sizey>fish3.sizex*fish3.sizey+30) {
	    if(isChasing=false) {
		chase=random(.5,1.5);
		xmov=chase*fish3.xmov;
		ymov=chase*fish3.xmov;
		isChasing=true;
	    }
	    stopChasing=true;
	  }
	  if(sizex*sizey<fish3.sizex*fish3.sizey-30) {
	    if(x>fish3.x && xmov<0 || x<fish3.x && xmov>0) {
		xmov=-1.2*xmov;
		ymov=-1.2*ymov;
	    } else {
		xmov=xmov*1.2;
		ymov=ymov*1.2;
	    }
	  }
	}
    }
    if(ident!=4) {
	if((x+sizex<=biggie.sizex+biggie.x+50 || x>=biggie.x-50) && (y+sizey<=biggie.sizey+biggie.y ||y>=biggie.y)) {
	  if(sizex*sizey>biggie.sizex*biggie.sizey+30) {
	    if(isChasing=false) {
		chase=random(.5,1.5);
		xmov=chase*biggie.xmov;
		ymov=chase*biggie.xmov;
		isChasing=true;
	    }
	    stopChasing=true;
	  }
	  if(sizex*sizey<fish1.sizex*fish1.sizey-30) {
	    if(x>biggie.x && xmov<0 || x<biggie.x && xmov>0) {
		xmov=-1*xmov;
		ymov=-1*ymov;
	    } else {
		xmov=xmov;
		ymov=ymov;
	    }
	  }
	}
    }
    //stop fish after they're done chasing
    if(stopChasing=false) {
	isChasing=false;
    }
    stopChasing=false;
//check for collisions between the fish and eat the smaller one
    if(ident!=1) {
	if((x+sizex<=fish1.sizex+fish1.x || x>=fish1.x) && (y+sizey<=fish1.sizey+fish1.y ||y>=fish1.y)) {
	  if(sizex*sizey>fish1.sizex*fish1.sizey+30) {
	    fish1.v=true;
	    fish1.x=random(1000);
	    fish1.y=random(400);
	    fish1.sizex=20;
	    fish1.sizey=20;
	    expand(bites,bites.length+1);
	    bites[chompCount-1]=new Chomp(int(x),int(y));
	    sizex=sizex+5;
	    sizey=sizey+5;
	  }
	}
    }
    if(ident!=2) {
	if((x+sizex<=fish2.sizex+fish2.x || x>=fish2.x) && (y+sizey<=fish2.sizey+fish2.y ||y>=fish2.y)) {
	  if(sizex*sizey>fish2.sizex*fish2.sizey+30) {
	    fish2.v=true;
	    fish2.x=random(1000);
	    fish2.y=random(400);
	    fish2.sizex=20;
	    fish2.sizey=20;
	    expand(bites,bites.length+1);
	    bites[chompCount-1]=new Chomp(int(x),int(y));
	    sizex=sizex+5;
	    sizey=sizey+5;
	  }
	}
    }
    if(ident!=3) {
	if((x+sizex<=fish3.sizex+fish3.x || x>=fish3.x) && (y+sizey<=fish3.sizey+fish3.y ||y>=fish3.y)) {
	  if(sizex*sizey>fish3.sizex*fish3.sizey+30) {
	    fish3.v=true;
	    fish3.x=random(1000);
	    fish3.y=random(400);
	    fish3.sizex=20;
	    fish3.sizey=20;
	    expand(bites,bites.length+1);
	    bites[chompCount-1]=new Chomp(int(x),int(y));
	    sizex=sizex+5;
	    sizey=sizey+5;
	  }
	}
    }
    if(ident!=4) {
	if((x+sizex<=biggie.sizex+biggie.x || x>=biggie.x) && (y+sizey<=biggie.sizey+biggie.y ||y>=biggie.y)) {
	  if(sizex*sizey>biggie.sizex*biggie.sizey+30) {
	    biggie.v=true;
	    biggie.x=random(1000);
	    biggie.y=random(400);
	    biggie.sizex=20;
	    biggie.sizey=20;
	    expand(bites,bites.length+1);
	    bites[chompCount-1]=new Chomp(int(x),int(y));
	    sizex=sizex+5;
	    sizey=sizey+5;
	  }
	}
    }