DOI: 10.2478/cjf-2022-0016
Review article
Comparative analysis of selected tissues of brown trout (Salmo trutta m. fario) from the fish pond and river Pliva, Bosnia and Herzegovina
2022, 80 (4) p. 151-164
Radojka Pajčin, Rajko Roljić, Zoran Ružić, Vera Nikolić, Smiljana Paraš
Abstract
Brown trout (Salmo trutta) is the most common type of fish that is grown in open and flowingfish ponds on the rivers of Bosnia and Herzegovina for consumption purposes. We conducted this study to examine the morphological and histological characteristics of trout from these fish ponds in comparison with trout from outside the fish farm. The study was conducted during three seasons: spring, summer, and autumn to perceive a complete picture of the condition of selected tissues and the condition of brown trout. Physicochemical characteristics of water from the Pliva River near Pljeva and the fish pond dealing with intensive breeding of trout were analyzed. These analyses have shown that there are no major deviations in water quality and that the water in the pond is of excellent quality. A total of 90 trout were harvested during all three seasons and their morphometric characteristics were determined by analyzing ten parameters. After dissection of all individuals, histological and stereological analysis was performed with the aim of comparing the tissues of the liver, stomach, gills and muscles. These analyses showed significant differences in the histoarchitecture of selected trout tissues from the pond compared to the river. Liver tissue had altered hepatocyte shape and presence of adipocytes; stomach tissue was with stronger mucosa and weaker muscle layer; gill tissue had lower respiratory lamellae; while muscle tissue had a significant presence of adipose tissue in brown trout living in the fish pond compared to those in the river.All the changes are due to the quality of commercial food, and the inability to move freely.
Keywords
brown trout, physicochemical analysis of water, morphometry, histology, stereology, Pliva river