Striped pijor (Telestes metohiensis) is endemic fish species from the group of minnows that is widespread in Eastern Herzegovina.The term minnow covers several fish species fish of watercourses in the karst area that is characterized by a specific way of life. Namely, one part of the life cycle is carried out in the underground lakes of karst caves, and when in certain hydrological phases comes to overflowing in the flood zone, minnows come out to surface waters. Research of physiological and ecophysiological characteristics of this species have a special significance because it is insufficiently researched species, which is on the Red List of the Republic of Srpska, while the two largest bases of these data WCMC and IUCN classified it in the first category of vulnerable species. The paper presents the results of research of leukocyte lineage of striped pijor from three watercourses: Vrijeka, Opačica and Zalomka. Using electrofishing, a total of 61 individuals were taken from the three mentioned rivers. Taking blood for hematological analysis was performed by cardiac puncture. Leukocyte lineage is represented by the leukocyte count and leukocyte formula. In differential blood count the largest presence was found in the count of lymphocytes and neutrophils. By comparing these parameters among individuals from different watercourses significant differences were not detected. However, differences were found in the proportion of basophils by females compared by streams, as well as differences in the proportions of pseudo-eosinophils and basophils by males and females within the watercourse. Key words: striped pijor, leukocytes, endemic species СажетакГатачка гаовица (Теlestes metohiensis) представља ендемичну врсту риба из групе гаовица, са распрострањењем на подручју источне Херцеговине. Термином гаовица обухваћено је више врста риба вода крашких подручја, које се карактеришу специфичним начином живота јер један дио животног циклуса проводе у подземним језерима крашких пећина, а када у одређеним хидролошким фазама долази до изливања воде у плавне зоне, гаовице излазе у површинске воде. Истраживања физиолошких и екофизиолошких карактеристика ове врсте имају посебан значај јер се ради о недовољно истраженој врсти, која је обухваћена Црвеном листом Републике Српске, док је двије највеће базе ових података WCMC и IUCN сврставају у прву категорију рањивих врста. У раду су представљени разултати истраживања параметара леукоцитне лозе гатачке гаовице из три
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