Herring fish belong to the family Clupeidae, which contains nearly 200 species. They are small, streamlined schooling fish that feed on plankton and live in both freshwater and saltwater.Herring have a single dorsal fin and protruding lower jaws and are silvery in color.erring fish belong to the family Clupeidae, which contains nearly 200 species. They are small, streamlined schooling fish that feed on plankton and live in both freshwater and saltwater.
ESTRING (estradiol vaginal ring) is an off-white, soft, flexible ring with a center that contains 2 mg of estradiol (an estrogen hormone). ESTRING releases estradiol into the vagina in a consistent, stable manner for 90 days.The soft, flexible ring is placed in the upper third of the vagina (by the physician or the patient). ESTRING (estradiol vaginal ring) should be removed after90 days of continuous use.If continuation of therapy is indicated, the flexible ring should be replaced.he soft, flexible ring is placed in the upper third of the vagina (by the physician or the patient). ESTRING (estradiol vaginal ring) should be removed after90 days of continuous use. If continuation of therapy is indicated, the flexible ring should be replaced.
The estrogen ring is a form of estrogen-replacement therapy in which the estrogen is delivered directly to the vagina. The estrogen is slowly released from a small, flexible ring that is inserted into the vagina and kept inside for three months at a time.Women are not generally aware of the ring and are able to have intercourse without their partner being aware of it.ince the vaginal ring and the tablet lead to lower levels of circulating estrogen in the bloodstream compared to taking estrogen by mouth or a skin patch, they are appealing options for women and physicians who are concerned about the risks of estrogen-replacement therapy.