sea urchins fecundation

[Socotroco]

I am making a proyect and I need help. At what density do sea urchins fecundated? at 45ppm? 20ppm? or sea water density?

[BrianPlankis]

Luis,

Do you mean specific gravity? sea urchins should be maintained at natural sea water strength (1.025-1.027 with 1.026 being best) and optimal temperatures.

Here is one reference on sea urchin spawning:

http://www.biolbull.org/cgi/content/abstract/181/2/261

I would suggest using google scholar or other databases for more references. What kind of project are you doing?

Brian

[Socotroco]

Is for my zoology class. I want to have some ideas before beginig with the experiment.