Aquaculture: Genetics. Dr. Craig Kasper FAS 1012 . Genetics: What is it?. Genetics : The science of heredity and variation.
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Dr. Craig Kasper
What other examples are out there??
Splake-brook trout/lake trout, Tiger Musky-northern pike/musky
Sunfish hybrids (many combinations)
affect non-endocrine tissues
Hormones in aquaculture
1) Human Chorionic Gonadotropin (hCG)
-mimics endocrine gonadotropins
-augements serum gonadotropins already present
-injected IM (often to get multiple broodfish to synchronize spawning), chorulon (FDA approved)
-dosage 50-2000 IU/kg wet weight
-330 IU’s for striped bass and white bass
2) Salmon Pituitary Extract (SPE)
-crude acetone dried preparation of whole pituitary
-natural source of gonadotropins
3) Carp Pituitary Extract (CPE)
*Use extracts which are closest phylogenetically to fish being injected!
4) Leutinizing hormone-releasing hormone
=Gonodotropin Releasing Hormone
Leutizing Releasing horomone=GnRH
LHRHa=analog (synthetic) (potent)
-triggers pituitary to release gonadotropins
-Intraperitoneal injection (IP)-rapid absoption
5) Methyltestosterone (MT)-used under strict control
-accelerates growth rate of some fish (no longer used for this purpose)
-sex reversal (apply during sexual differentiation
tilapia, walleye, yellow perch
-can be used to sterilize fish (monosex population)
-can be given orally (food)