Spawn medicine ovaprim injection hormones for fish breeding
How is spawning triggered naturally?Spawning, the release of gametes (mature oocytes/eggs by the female or of sperm/milt by the male) from the gonads (ovaries or testes), is the final event in the reproductive cycle (Rottmann et al. 1991a), and is the result of complex interactions between a variety of hormones and different tissues/organs in the fish's body.The following description is a very simplified version of major events (Rottmann et al. 1991a; Figure 1a) that occur during natural spawning. Environmental and internal factors (which differ from species to species) trigger a hormone cascade leading to egg maturation and release in females, and sperm maturation and release in males. First, a hormone called "gonadotropin-releasing hormone" (GnRH) is released from the hypothalamus portion of the brain and travels to the pituitary gland, which then releases gonadotropin hormones (especially GtH-II). The gonadotropin hormones/GtH-II travel to the ovaries and testes and stimulate them to produce steroids and prostaglandins, hormones that act directly on the gonads to cause final maturation and release of oocytes ("eggs") in females (ovulation), and the release of sperm in males (spermiation) (Rottmann et al. 1991a; Evans and Claiborne 2006). In some species of fish, a compound called dopamine naturally blocks this hormone cascade and inhibits egg and sperm production under certain conditions, for example, exposure to major stressors.What is Ovaprim?Ovaprim is a two-part drug consisting of 1) a shorter, synthetic version of GnRH and 2) domperidone. Ovaprim is marketed ready to inject in a liquid form.In the ornamental fish industry, Ovaprim is used as a spawning aid to induce ovulation (release of mature oocytes/eggs) and spermiation (release of milt/sperm) in mature, properly conditioned brood-fish. Ovaprim is especially useful for species for which natural spawning in captivity is difficult to induce.
DESCRIPTION:Dexamethasone is a glucocorticosteroid with a strong antiflogistic, anti allergic and gluconeogenetic action. COMPOSITION:Contains per ml.:Dexamethasone base ....2 mg.Solvents a
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