Health Status of the Nase (Chondrostoma nasus) in Breeding Farms from the Jihlava River Basin

Abstract

This study compares two fish farms in the Jihlava River basin that differ mainly in the intensity of rearing of the nase fry and in water sources. During rearing, we observed the health condition of fry from hatching to expedition at the age of one year. Four species of parasites (i.e., Ambiphrya ameiuri, Apiosoma piscicolum, Trichodina sp., Diplostomum spathaceum) were found to infest the fish and Aeromonas hydrophila was isolated by bacterial culture. In both breeding facilities the intensity and prevalence of Ambiphrya ameiuri increased during the summer. The state of health and its development including the recognised infections was similar in both farms. Immunological indicators such as differential white cell count, absolute white cell count and the oxidative burst in autumn were evaluated in the fry samples. Although fry from both farms had similar health condition, the results on immunological indicators show that fry from farm I are more exposed to the effects of stressors. In the next phase, we confronted immunological indicators of fry from farm II and brood fish from the Jihlava River. The results show differences in immunological indicators, which could be caused by a variety of stress factors having different effects on the immune system of these two fish categories. The environment affects greatly the immunity of juvenile as well as brood fish. It reflects in the different levels of immunological indicators in the comparison of fry from two farms as well as in the comparison of fry and brood fish from the river. Chemiluminescence, phagocytic activity, brood fish, fingerling

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“…Additionally, the multidisciplinary approach combining not only aquaculture production data but also welfare and healthy aspects, genetic, phenotypic and geographic structuring of phenotypic and genetic diversity across populations both natural and captive) should be given strong attention (Rabova, Rab, Ozo uf-Costaz, Ene, & Wanzebock, 2003;Hanfling et al, 2009;Popovic et al, 2013;Hudson et al, 2014). Rearing riverine fish under non-flowing conditions may be stressful and lead to adverse growth but also can increase the potential to the diseases (Recek, Palikova, Lojek, & Navratil, 2009). Using of local fish stocks instead of non-native stocks often use in commercial hatcheries seems to be preferred for many aspects in conservation captive breeding restocking programs of many endangered species (Laikre, 2010;Luikart, Ryman, Tallmon, Schwartz, & Allendorf, 2010;Popovic et al, 2013;Vetesnik, Halacka, Papousek, Mendel, & Simkova, 2009).…”

Chronic effects of a monogenean Ligictaluridus floridanus (Ancyrocephalidae) infection on channel catfish (Ictalurus punctatus) growth performance

“…One of the factors associated with fish mortality in cultured systems is related to stress. Environmental and management farm practices including social stress may affect the immune system of fish, leading to or predisposition to disease (Reček et al 2009). …”