ya man, it is a nutrient that the grower used, and also it is combined with no flushing at the end of the harvest. i have had some "hydro" buds that smelled and tasted just like fish and i asked the same question a long time ago and i got the answer im giving you. best thing is to keep growin your own, do a very good flush, and you should be good to go!

keep it green-dnutz