JSFiddle - React, Tailwind, and code Playground

HTML

<div id="fish"></div>

CSS

#fish{background-image:url(http://www.2020mediaonline.com/lptest/images/fish_off.jpg);width:459px;height:474px;}

JavaScript

$('#fish').hover(
  function(){$('#fish').css("background-image", "url(http://www.2020mediaonline.com/lptest/images/fish_on.jpg)")},
  function(){$('#fish').css("background-image", "url(http://www.2020mediaonline.com/lptest/images/fish_off.jpg)")}
);