Background: When pesticides are introduced into wetlands by agriculture, fish quickly absorb them through their gills. Pesticides reduce hatchability, impede growth, and antioxidant response, killing fish. Therefore, it's crucial to find effective pesticide mitigation methods for fish.Objective: In this study, the effects of garlic (Allium sativum) oil on the growth, haematology, biochemistry and histopathology parameters of Nile tilapia (Oreochromis niloticus) exposed to cypermethrin toxicity were investigated.Methods: In the research, cypermethrin was added to the water of the experimental groups at a rate of 1:20 of the LC₅₀ value, and 1.00% garlic oil was added to the fish feed. Fish with an initial weight of 30.26 ± 0.26 g were fed for 45 days.Results: At the end of feeding, the final weights were determined as 69.39 ± 0.41 (G1), 61.81 ± 0.65 (G2), 82.25 ± 0.36 (G3), and 75.04 ± 0.68 (G4) grams, respectively. Histopathological examinations revealed serious lesions in the gill, liver, brain, and muscle tissues in the cypermethrin group, whereas these lesions were minimal or absent in the garlic oil group.Conclusions: Garlic oil supplementation had positive effects on growth, haematology, blood biochemistry, hepatosomatic index and histopathological parameters. These findings suggest that garlic oil is a potential protective agent against cypermethrin toxicity.

This study was conducted to investigate the effects of dietary black cumin (Nigella sativa L.) oil on growth performance, hemato‐biochemical, and histopathology of cypermethrin‐intoxicated Nile tilapia. After determining the LC₅₀ (96 h) value of cypermethrin, cypermethrin was added to the water at a ratio of 1:20 of this concentration, and the fish were fed for 42 days. To reduce the effects of cypermethrin, 1% black cumin oil was added to the fish feed as a potential protectant. Growth parameters, hematology, blood biochemistry, and histopathological changes of Nile tilapia were examined after the feeding period. In this study, the best growth was observed in the group fed with feed containing 1% black cumin oil, while the worst growth performance was observed in the group fed with water containing cypermethrin and without black cumin oil in the feed. As a result of the study, it was observed that black cumin oil added to the fish diet reduced the negative effects of water‐borne cypermethrin on growth, hematology, blood biochemistry, and histopathological parameters of Nile tilapia.

The effects of different levels of boron supplementation to feed on the growth parameters of rainbow trout (Oncorhynchus mykiss) were investigated for the first time using four diet variations (0.01%, 0.05%, 0.10%, and 0.20% of boron in feed) in addition to a control diet (without boron). After 120 days of feeding, the final weight (FW), weight gain, condition factor, feed intake, feed conversion rates, specific growth rate, protein efficiency ratio, survival rates, economic conversion rate, and economic profit index were calculated for each treatment and compared with the control as growth parameters. The initial weight was 17.89 ± 1.12 g; at the end of feeding, the FWs were determined as 89.91 ± 2.11 g for the control and 90.56 ± 1.34 g, 99.21 ± 3.76 g, 88.14 ± 2.43 g, and 78.74 ± 1.47 g for 0.01%, 0.05%, 0.10%, and 0.20% of boron feed treatments, respectively. The results of this study show that feeding rainbow trout with 0.05% boron-supplemented feed stimulates the growth parameters, but 0.20% of boron supplementation inhibits the growth of rainbow trout.