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 Biosense Laboratories AS
 Thormøhlensgt. 55
 Bergen, N-5008,
 Norway
 Tel:(+47) 55543966
 Fax:(+47) 55543771
 E-Mail: biosense@biosense.com

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11-ketotestosterone ELISA test kit
While testosterone is the primary androgenic male steroid found in mammals, 11-keto testosterone (11-KT) is a second key andogenic steroid found in fish. It occurs in males together with testosterone in amounts which vary from less than 1 ng/ml to as much as 50-100 ng/ml, depending on the species and the stage of the reproductive cycle. In the sea bass, testosterone concentrations are generally higher than 11-KT, with peak levels found after the spawning season. 11-KT, on the other hand, remains at levels less than 1 ng/ml but rises abruptly to 4-6 ng/ml during spermiation at the height of the spawning season (1). 11-KT also shows individual variations in Arctic char, with dominant males having significantly higher 11-KT levels (2).

References:
1 Prat, F., Zanuy, S., Carrillo, M., et al. Seasonal changes in plasma levels of gonadal steroids of sea bass, Dicentrarchus labrax L. Gen Comp Endocrinol 78, 361-373 (1990)
2 Elofsson, U.O.E., Mayer, I., Damsgård, B., et al. Intermale competition in sexually mature arctic char: effects on brain monoamines, endocrine stress responses, sex hormone levels, and behavior. Gen Comp Endocrinol 118 450-460 (2000)

The kit is recommended for industrial safety laboratories, ecotoxicological testing laboratories, and academic research laboratories involved in chemical product testing, effluent testing, environmental monitoring and ecotoxicological research.

For further information please contact us at biosense@biosense.com