Effect of teleost pituitary growth hormone on growth of Tilapia mossambica and on growth and seawater adaptation of sockeye salmon (Oncorhynchus nerka)
1977; Elsevier BV; Volume: 33; Issue: 2 Linguagem: Inglês
10.1016/0016-6480(77)90241-6
ISSN1095-6840
AutoresW. Craig Clarke, Susan Walker Farmer, K.M. Hartwell,
Tópico(s)Growth Hormone and Insulin-like Growth Factors
ResumoPurified Tilapia growth hormone (GH), which has already been shown to have slight but significant activity in the rat tibia assay, was found to promote growth in two intact teleost species, Tilapia mossambica and Oncorhynchus nerka (sockeye salmon). Tilapia GH and bovine GH were approximately equipotent in stimulating an increase in both length and weight of these fish. In salmon, ovine prolactin (PRL) stimulated growth with a much lower potency than Tilapia GH, while Tilapia PRL was inactive. Furthermore, bovine GH, Tilapia GH, and ovine PRL facilitated adaptation of the salmon to sea water, while Tilapia PRL had no effect. These data, along with published results of teleost bioassays specific for Tilapia PRL, demonstrate that teleosts can readily distinguish between Tilapia GH and Tilapia PRL. This separation contrasts with previously reported similarities between the two hormones with respect to amino acid composition, immunochemistry, and activity in the rat tibia assay.
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