The answer(s)No, it is not true.
Plastic bags and other large plastic things are a big problem for any kind of fish !
StoryMicroplastics are very small pieces of plastic that pollute the environment. Microplastics are not a specific kind of plastic, but rather any type of plastic fragment that is less than 5 mm in length according to the U.S. National Oceanic and Atmospheric Administration (NOAA).They enter natural ecosystems from a variety of sources, including cosmetics, clothing, and industrial processes
Wikipediahttps://en.wikipedia.org/wiki/Microplastics
Linkhttp://www.independent.co.uk/environment/microplastics-ocean-pollution-whales-sharks-threat-plastic-coffee-cups-microbeads-a8194131.html