DAO 126:257-262 (2017)  -  DOI: https://doi.org/10.3354/dao03168

NOTE
Hematology and condition factor of tui chub and fathead minnow parasitized by nematode from Upper Klamath Lake, Oregon, USA

Maurício L. Martins1,2,*, Marcos Tavares-Dias3, Andrew J. Janik1, Michael L. Kent1, Gabriela T. Jerônimo2,4

1Department of Microbiology, Oregon State University, 220 Nash Hall, Corvallis 97331, OR, USA
2AQUOS - Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (UFSC), Rod. Ad. Gonzaga 1346, Florianópolis, 88040-900, SC, Brazil
3Embrapa Amapá, Rodovia Juscelino Kubitscheck, km 5, 2600, Macapá, 68903-419, AP, Brazil
4Laboratory of Ichthyopathology and Comparative Zoology, Nilton Lins University, Av. Nilton Lins 3259, Manaus, 69058-030, AM, Brazil
*Corresponding author:

ABSTRACT: This study evaluated the hematological profile and condition factor (Kn) of tui chub Siphateles bicolor and fathead minnow Pimephales promelas and their associations with larvae of Contracaecum sp. infection of the heart. A total of 30 tui chub and 17 fathead minnow were collected from Upper Klamath Lake, Oregon, USA, measured, and weighed and blood was drawn for hematological analysis. Nematode larvae parasitized tui chub with a prevalence of 50% and mean intensity of 1.40, while 11.8% of fathead minnow were parasitized at a mean intensity of 1.0. Non-parasitized tui chub were significantly larger than the parasitized fish, indicating that small fish could be easily predated by the definitive host, a piscivorous bird. Although the relatively large worm occupied a large portion of the atrium, the presence of the larvae did not affect tui chub Kn, possibly associated with low parasite intensity and a harmonic co-evolution. Only parasitized fathead minnow showed significant differences in red blood cell measurements (greater cell width and larger nuclei) compared to non-parasitized fish. Lymphocytes were the most common white blood cells found in tui chub, followed by neutrophils, monocytes, and periodic acid-Schiff positive granular leukocytes; in fathead minnow lymphocytes were followed by heterophils, monocytes, neutrophils and eosinophils. This study is the first report of Kn and description of blood cells and hematological parameters in these fish species.


KEY WORDS: Fish · Cyprinid · Condition factor · Blood · Nematode


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Cite this article as: Martins ML, Tavares-Dias M, Janik AJ, Kent ML, Jerônimo GT (2017) Hematology and condition factor of tui chub and fathead minnow parasitized by nematode from Upper Klamath Lake, Oregon, USA. Dis Aquat Org 126:257-262. https://doi.org/10.3354/dao03168

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