The effect of water temperature on food transit time and digestive enzymes activity in Caspian kutum (Rutilus kutum) larvae

Nahid Ghysvandi; Abdolmajid Hajimoradloo; Seyed Hossein Hoseinifar

The effect of water temperature on food transit time and digestive enzymes activity in Caspian kutum (Rutilus kutum) larvae

2014

Nahid Ghysvandi | Abdolmajid Hajimoradloo | Seyed Hossein Hoseinifar

The present study investigates the effects of water temperature on digestive enzymes activity and food transit time in Caspian kutum (Rutilus kutum) larvae. Caspian kutum larvae (532 ± 0.05 and 543 ± 0.02 mg) were divided into two groups with three replicates and reared at different water temperature i.e. 25.6 ± 0.4°C (T1) and 18.4 ± 0.1°C (T2). At the end of the experiment, sampling of intestine was performed at 0, 1, 3, 5, 8, 16, 24 and 30 h after feeding from each treatment. In T2, food was observed until 24 h after feeding and the intestine was empty 29 h after feeding, while in T1 19 h after feeding the intestine was empty. Digestive enzymes activities were higher in T2 treatment. The peaks of trypsin and alkaline phosphatase enzymes activity were found 8 h after feeding in T1, while occurred 16 h after feeding in T2. The highest chymotrypsin and alpha-amylase enzymes activity were observed 5 and 8h after feeding in T1 and T2, respectively. These results confirmed remarkable effects of temperature on food transit time and digestive enzymes activity of Caspian kutum.

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