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Open access

Usman Muhammad Tang, Zainal Abidin Muchlisin, Henni Syawal and Heri Masjudi

Abstract

The objectives of the present study were to analyze the effect of temperature regimes on stress levels and to determine the suitable water temperature for the domestication of tapah, Wallago leeri Bleeker. A completely randomized method was used in this study, and three levels of water temperature were tested, namely, 27, 29, and 31°C, in seven replicates. A total of 500 experimental fish were collected from the Kampar River, Langgam, Riau, Indonesia, and transported to the Aquaculture Laboratory, Riau University. The fish were reared in 21 tanks at stocking densities of 70-100 fish tank−1. The fish were fed rough fish three times a day at 08:00, 12:00, and 21:00 for 30 days. Blood samples were taken on days 1, 14, and 29, which were analyzed for cortisol, glucose, and plasma protein. Growth and survival rates were recorded at the end of the experiment. ANOVA showed that water temperature had a significant effect on the stress condition, growth, and survival rate of tapah. Lower blood glucose, protein, and cortisol plasma levels were recorded in fish acclimatized at 29°C with values of 14.44 mg dL−1, 5.35 g dL−1, and 6.90 mg mL−1, respectively. Additionally, higher growth performance (32.30 g) and survival rates (100%) were also found in fish reared at 29°C. It was concluded that the best water temperature for the domestication of tapah is 29°C.

Open access

M. Woźny, P. Brzuzan, M. Gusiatin, E. Jakimiuk, S. Dobosz and H. Kuźmiński

Influence of zearalenone on selected biochemical parameters in juvenile rainbow trout (Oncorhynchus mykiss)

Zearalenone (ZEA) is a mycoestrogen frequently found in food and animal feed materials all over the world. Despite its hydrophobic character, ZEA is also found in surface and ground waters which suggests an environmental risk for aquatic animals. Knowledge concerning mycotoxin-related mechanisms of toxicity is still incomplete, e.g. little is known about the influence of ZEA exposure on fish. The aim of this study was to investigate the effect of ZEA on selected biochemical parameters in juvenile rainbow trout after 24, 72, and 168 h of intraperitoneal exposure (10 mg/kg of body weight). The analysis showed a slight tendency towards prolonged blood clotting time and significant iron deficiency in the liver and ovary of exposed animals. However, no differences in aminotransferase (AlaAT, AspAT) activity or glucose levels in fish plasma was observed. The results of this study suggest that although trout exposed to ZEA did not exhibit any distinct symptoms of liver damage, the mycotoxin tested was able interfere with blood coagulation and iron-storage processes.