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Showing 2 results for Digestive System
Effects of Different Levels of Dietary Vitamin C on Growth Performance, Digestive Enzymes Activity and Blood Stress Factors of Nile Tilapia (Oreochromis Niloticus) Under Sub-Lethal Toxicity of Malathion
E. Salamroodi , K. Rezaei Tavabe, S. Javanmardi,
Volume 8, Issue 1 (3-2019)
Abstract

Aims: Malathion is one of the agricultural organophosphate pesticides used in agriculture that may be found in aquaculture centers. The aim of this study was to investigate the effects of different levels of dietary vitamin C on improving the situation of growth, digestive enzymes activity and blood stress factors of Nile Tilapia (Oreochromis Niloticus) under sub-lethal toxicity of malathion.

Materials & Methods: In this experimental study, 180 Nile tilapia with weight average of 12.5±5g were subjected to 25% concentrations of Lc50 96h of malathion for 28 days and during this period, the fishes were fed with different levels of vitamin C (0, 300, 600, and 900mg/kg of feed). Data were analyzed by Duncan's new multiple range test and one-way analysis of variance through SPSS 24 software.

Findings: The weight gain and specific growth rate of fish fed by the highest vitamin level (900mg/kg of feed) were significantly higher than other groups (p<0.05), while the feed conversion ratio in the fish under mentioned treatment significantly decreased compared to other treatments. Trypsin and chymotrypsin digestive enzyme activities were significantly increased in treatments of 600 and 900mg/kg vitamin C in diet, respectively. The activity of other enzymes at different concentrations of vitamin C in the diet did not show a significant difference (p>0.05). Blood glucose level was significantly higher in control treatment in comparison to the other treatments.

Conclusion: Vitamin C as an anti-stress agent reduces the stress in Nile tilapia subjected by Malathion pesticides and improve the metabolic status and growth performance of Nile tilapia.


A survey on gastrointestinal helminths of Euryglossa orientalis in Bandar Abbas coast
Karaneh Parizadeh, Abdolhossein Dalimi,
Volume 11, Issue 2 (5-2022)
Abstract
So far, very limited research has been done on Euryglossa orientalis parasites in our country. In the present study, helminthic infection of 50 digestive tracts of E. orientalis, were examined in Bandar Abbas in 2016. After procuring the fishes, they were transferred to the laboratory and different parts of their bodies were measured for a morphometric study. Then whole digestive tract of the fishes was removed, opened with a small scissor into a dish and the contents was searched for the presence of helminth. Then, the isolated helminth parasites were fixed in 5% formalin or 70% ethanol and stained with azocarmine. The parasites were identified with the aid of reliable sources. The results indicated that out of 50 fish tested, only 5 fish (10%) were infected with the parasite. Thus, in 10% of the fish, Plagiocirrus primus and in 2% of them, Lepocreadioides zebrini and Scolex pleuronectis were identified. This result shows that the infection of Euryglossa orientalis with helminths is mild in the coasts of Bandar Abbas in summer. P. primus is reported for the first time from Persian Gulf coasts.

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