Any operation relating to chank fisheries to be under licence

F. Any operation relating to chank fisheries to be under licence.--On and from the date specified under sub-section (1) of section 6-D, no person shall fish or dive for chank or collect chanks from any chank beds, or use any vessel for such purposes or carry on any business, industry or other activity in respect of chanks except under a licence granted by the authorised officer in such manner as may be prescribed: Provided that nothing contained in this section shall be deemed to require the obtaining of any licence in respect of such chanks as are alleged to have been inadvertently caught along with other species of fish as incidental to fishing in the course of any fishing operation made by any person; and such chanks so caught inadvertently shall be surrendered immediately to such authority within such time in consideration of payment of such rates, as may be prescribed.