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Spirlin (Alburnoides bipunctatus) is found in great numbers in most Transylvanian rivers. The species has an important role in the ecosystems in which it is found in terms of feeding and habitat occupation. The morphmetric characthers of this species vary between different habitats, outlining morphometric plasticity. Morphometric profiles were made for different populations of Spirlin, to evaluate differences in body shape. Considering that different environmental conditions influence the morphology of Spirlin populations, morphometric characteristics were determined. In order to assess differences in spirlin body shape, specimens from the four major Transylvanian catchments were collected by angling techniques. The specimens were preserved and transported to the University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, where morphometric measurements and weight determinations were conducted in the Physiology of Aquatic Organisms Laboratory. Spirlin from Mures, Somes, Cris and Viseu catchments were studied, as it follows: 21 specimens from Aries River (Mures catchment), 61 specimens from the river Crisul Repede (Cris catchment), 21 specimens from Somesul Mic River (Somes catchment) and 20 specimens from Viseu River. A number of 39 determinations were made. The obtained results reflect the morphometric differences among populations of Spirlin from some Transylvanian main rivers. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

In this study the structure of the Danube crayfish (Astacus leptodactylus) population from Ţaga Mare Lake, Cluj County was analyzed. According to the study results, three age categories (2+, 3+ and 4+) were identified for the Danube crayfish specimens. Numerically, females are more numerous than males, the sex ratio between males and females being as follows: SR2+ = 0.33; SR3+ = 0.33; SR4+ = 0.86. In terms of body size, males are better developed, except for their abdominal segments, where females are better developed due to the female reproductive function. [ABSTRACT FROM AUTHOR]