Strongylocentrotus fragilishas the greatest size of gonads in Janurary and Feburary of a yearly cycle according to the data collected in Further studies on Allocentrotus fragilis, a deep-sea echinoid(Giese, A. C. 1961).The enlarged gonad size of this period is the indicator of the readiness of spawning ofStrongylocentrotus fragilis. The studies of A. R. Moore proof this information with the sperms and eggs collected in Feburary and March that resembles the development ofStrongylocentrotus fragilis.This spawning time is not caused by increased light and temperature. It might be caused by the occurance of algal extract of the plankton at this time, or the innate periodicity character of the species (Moore, A. R. 1959).
(Strongylocentrotus fragilis is usually referred asAllocentrotus fragilis.)
Strongylocentrotus fragilis is a species of sea urchin of the family Strongylocentrotidae.
This is a regular sea urchin, with a spherical test bearing the anus and top and mouth on the bottom. They are somewhat flattened, and of pale pinkish color with white spines. It is a deep-sea species, and they can occur in great number where food is abundant.
This is an abyssal species, occurring at many hundred meters deep on the western coasts of the North America.[1] They are distributed throughout the continental shelf and slope, being most abundant in the 200-300m depth range.[2][3]
It was first scientifically described in 1912 by Jackson.[4]
This species is often referred as Allocentrotus fragilis, and its taxonomy is still under debate.[1]
Strongylocentrotus fragilis is a species of sea urchin of the family Strongylocentrotidae.
