The problem of invasive species of fish is a major issue, both internationally and nationally. The presence of invasive species is often associated with acclimatization of new species of fish, activities correlated with the absence of effective control and quarantine programs. In other words, when new desired species are imported, other accompanying species are also brought in often in the form of embryonated eggs or juveniles. The brown bullhead, which we have studied, is also an invasive species of fish in Stejeris Lake, Cluj County. This species is of interest, both scientifically and economically. From the scientific point of view, brown bullhead has a high capacity of resistance to environmental changes, unfavourably conditions, which ensures a perpetuation of the species in almost every aquatic environment. Even though it is recognized that the economic impact of this invasive species is significant, not much information is available at present, and neither is there much data about the topography of its internal organs, which is being studied in this paper.
In this research we analysed the phenotypic characterization of Salmo trutta fario species and we studied the effect of the saline solution used as an activator for seminal material. The spermatozoa mobility ratio in our study ranged from 60% to 95%, with an average of 74% when using water and 84.5% when a saline solution (NaCl) of 7‰ was used. The average mobility time ranges between 58.7 seconds (water) and 99 seconds (saline solution). Biochemical analyses of seminal plasma were performed and parameters such as ions concentration (Na + , K + , Ca
2+, Mg 2+ , Cl -), protein profile (BUN, TP), lipid profile (TG, Chol) and enzyme profile (ALP) were followed. As a result of our research on semen in brown trout, we noticed that saline solution (7‰) compared to water when used as an activator of seminal material, is more effective in activating spermatozoa.
Spirlin (Alburnoides bipunctatus) is an important element of the trophic chain of aquatic ecosystems in Romania's hilly areas. To assess the conservation status of this species, 21 specimens were taken from the Letca area, Sălaj County. The specimens caught were weighed and analysed from the meristic (8 determinations) and morphometric (36 determinations) points of view. The obtained results reflect the homogeneity of the fish population in terms of morphology (their coefficients of variation showing lower values). This study will continue in the future with the analyses of the spirlin populations from several sectors of the Someș River and its tributaries.
The purpose of this this study was to complete the data from the specialized literature regarding some morphological charactersof male and female breeders of brown trout (Salmo trutta fario), exploited in Fiad trout farm, Bistrița-Năsăud County, Romania. The body mass (Bm) of males ranged from 0.67 kg to 1.39 kg with a mean value of 0.96 ±0.07 kg. The body mass of females (Bm) ranged from 0.50 kg to 0.90 kg with a mean value of 0.73±0.04 kg. In terms of descriptive statistics, the values of variability of studied characters, both males and females, are low. This low variability, shows the existence of a good homogeneity of the breeding group from Fiad trout farm.The One-Way ANOVA analysis showed that there is no statistically significance difference for the means of studied characters, except for commercial length and small perimeter of fishes. The results of t-test for showed that there is a statistically significance difference between the measurements and the gender of the specimens.
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