Anybody know if/ how they can tell from a female and/or male scallop and how they reproduce ?

Answer 1

I don't know that you could sex them, other than relative size if you're asking about the flame scallops (which are a clam, not really a scallop) in saltwater aquariums. They have a life cycle where they change from male to female as they grow: http://findarticles.com/p/articles/mi_m0QPU/is_2_24/ai_n15380342?lstpn=article_results&lstpc=search&lstpr=external&lstprs=other&lstwid=1&lstwn=search_results&lstwp=body_middle These do poorly in aquaria, in case you might be thinking of getting one (or two as the case seems).

If you're asking about the bay scallops/sea scallops we eat, some of these are both genders at the same time: http://findarticles.com/p/articles/mi_m0QPU/is_3_23/ai_n13562911

Others are separate genders their entire lives, but you'd need to dissect them to find out which is which: http://www.bioc.rice.edu/precollege/galbay/galbay99/students/scallop/scallopbay.html
http://www.mi.mun.ca/mi-net/aquacult/scallop.htm#reproduction

Answer 2

In general sea scallops have both sexes. Scallops reproduce by releasing their eggs and sperm into the water in the hope that chance match-ups will occur.

More info
http://www.cobscook.org/cobscookBay/soundings/art6-sca.htm

Answer 3

sry no possbe way