The growth performance, survival and reproductive success of Clarias gariepinus broodstocks were examined as they responded to 17-methyl testosterone (MT) and absolute ethanol mixed in their feed in varying levels of 50 mgKg-1 /MT, 100 mgKg-1 /MT and 0 mgKg-1 /MT. These inclusion levels also served as the three treatments TC 50, TC 100, TC 0. A total of 24 Clarias gariepinus broodstocks were stocked in six (6) concrete stagnant systems of 4 (2 males, 2 females) fishes per tank of 2metre by 2metre square, with duplicated treatments of TC 50 and TC 100. Treatment TC 0 was also duplicated, and served as the control, with 4 fishes per tanks (2 males and 2 females). Duration was for ninety (90) days. The mean initial weights were taken as 2.05 ±353.56g for treatment TC 50, 1.60 ±282.84g for treatment TC 100 and 1.65±494.98g for treatment TC 0. Highest mean weight gain of 3.45±2.22g observed in the study was seen in the Clarias gariepinus broodstock tank TC 50. Performance index showed treatment TC 50 performed highest with value 601.85±239.09. Survival rate was high in treatment TC 50 with 50.0±0.00%, higher in treatment TC 0 with 62.50±17.68% and highest in treatment TC 100 with 87.50±17.68%. Condition factor K was greater than 1 throughout the study showing well-being of the fishes; highest in treatment TC 50 at value 7.20. Water quality parameters were at normal ranges throughout the study.

As from January 2010 The Israeli Journal of Aquaculture-Bamidgeh (IJA) will be published exclusively as an on-line Open Access (OA) quarterly accessible by all AquacultureHub (http://www.aquaculturehub.org) members and registered individuals and institutions. Please visit our website (http://siamb.org.il) for free registration form, further information and instructions. This transformation from a subscription printed version to an on-line OA journal, aims at supporting the concept that scientific peer-reviewed publications should be made available to all, including those with limited resources. The OA IJA does not enforce author or subscription fees and will endeavor to obtain alternative sources of income to support this policy for as long as possible.

As from January 2010 The Israeli Journal of Aquaculture-Bamidgeh (IJA) will be published exclusively as an on-line Open Access (OA) quarterly accessible by all AquacultureHub (http://www.aquaculturehub.org) members and registered individuals and institutions. Please visit our website (http://siamb.org.il) for free registration form, further information and instructions. This transformation from a subscription printed version to an on-line OA journal, aims at supporting the concept that scientific peer-reviewed publications should be made available to all, including those with limited resources. The OA IJA does not enforce author or subscription fees and will endeavor to obtain alternative sources of income to support this policy for as long as possible.

As from January 2010 The Israeli Journal of Aquaculture-Bamidgeh (IJA) will be published exclusively as an on-line Open Access (OA) quarterly accessible by all AquacultureHub (http://www.aquaculturehub.org) members and registered individuals and institutions. Please visit our website (http://siamb.org.il) for free registration form, further information and instructions. This transformation from a subscription printed version to an on-line OA journal, aims at supporting the concept that scientific peer-reviewed publications should be made available to all, including those with limited resources. The OA IJA does not enforce author or subscription fees and will endeavor to obtain alternative sources of income to support this policy for as long as possible.

Sex determination, growth performance and survival of Clarias gariepinus juveniles were examined as they responded to 17-methyl testosterone (MT) and absolute ethanol mixed in their feed. Varying levels of 50 mgKg-1 /MT, 100 mgKg-1 /MT and 0 mgKg-1 /MT were used. These inclusion levels further served as treatments TCG 50, TCG 100, TCG 0. A total of 270 Clarias gariepinus juveniles were stocked in six (6) concrete stagnant systems of 2metre by 2metre square. Treatments were duplicated and TCG 0 served as the control. Duration was for One hundred and twenty one (121) days. The mean initial weights were taken as 0.05±0.00 a g for treatment TCG 0, 0.06±0.01 a g for treatment TCG 50 and 0.05±0.00 a g for treatment TC 100. Highest mean weight gain of 2.40±0.21 b g observed in the study was seen in the Clarias gariepinus juvenile tank TCG 50. Performance index showed treatment TCG 50 performed highest with value 116.02±0.00 a. Survival rate was highest in treatment TCG 0 with 92.22±1.57 a %, higher in treatment TCG 100 with 83.33±7.86 a % and high in treatment TCG 50 with 81.11±1.57 a %. Condition factor K was greater than 1 throughout the study showing well-being of the fishes; highest in treatment TCG 50 at value 6.67. Water quality parameters were at normal ranges throughout the study.