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• The comparison of sperm motility and density in four different goldfish (Carassius auratus) types

  135-140

  Borbála Nagy

  Gergely Bernáth

  Levente Várkonyi

  József Molnár

  Levente Zete Láng

  Tibor Izsák

  Tamás Bartucz

  István Iittzés

  Áron Ittzés

  Béla Urbányi

  Zoltán Bokor

  Views:

  102

  Different goldfish types play an important role both in ornamental fish farming and science. Considering its historical background, the goldfish is a suitable model animal for the study of artificial selection as well as for developmental biological studies. Sperm motility and cell density is an important parameter in determining sperm quality. The aim of our study was to examine the effects of different goldfish types on the sperm quality. Several sperm motility parameters (progressive motility (pMOT, %), straight line velocity (VSL, μm s^-1), curvilinear velocity (VCL, μm s^-1), linearity (LIN, %), amplitude lateral Head Displacement (ALH, μm), Beat Cross Frequency (BCF, Hz)) of four different goldfish types (Common goldfish-“wild type” N=5, Shubunkin N=4, Black Moor N=4, Oranda N=5) was compared during 60 hours (at 12-hour intervals) at refrigerated storage (4 °C). The variability of sperm density was also investigated in all types. A similar cell concentration was determined in the four goldfish variants (Common goldfish 2.01*10¹⁰ ± 3.46*10⁹; Shubunkin 1.71*10¹⁰ ± 3.25*10⁹; Black Moor 1.66*10¹⁰ ± 3.02*10⁹; Oranda 1.56*10¹⁰ ± 5.83*10⁹). Statistically significant difference between the 4 goldfish types in the motility parameters and cell density was not noted. However, a decreasing tendency in Black Moor sperm motility parameters (pMOT, VCL and VSL) was observable, as well as a reduced spermatozoa density in Oranda was also recorded. Our results can contribute to the improvement of the common hatchery propagation of goldfish. Future studies can add more evidence of the possible effects of artificial selection on the reproduction in different goldfish types.

   

• Effect of the dry and rainy weather on the Idared and Golden Reinders apple varieties fruit quality

  107-110

  Attila Illés

  Péter Tamás Nagy

  Tamás Lang

  Zoltán Szabó

  József Nyéki

  Miklós Soltész

  Views:

  83

  Weather conditions have an important role in fruit production. In the last few decades, this role is increased and basically determines the
  fruit quality and quantity. Despite of this statement, there is but very few information about impacts caused by weather anomalies in
  Hungarian orchards. Regarding this, the relation between the external, and internal values of the Idared and Golden Reinders apple varieties,
  the changing of the temperature and precipitation in a dry year (2009) as well as in a rainy year (2010) were investigated. The examined
  apple varieties are grown at the same training system (rootstock, spacing, training, pruning system). The average weight, average diameter,
  acid content and soluble solids were higher in 2009 than in 2010, although the precipitation was higher in 2010. Due to the many rainy days
  the intensity of sunshine and the number of sunny days were less. To produce better quality it is very important the amount of the sunshine
  and heat, the optimal temperature and the precipitation rate.