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Summary Gynogenesis is one of several chromosome‐manipulating techniques used in fish. In gynogenesis the male does not contribute to the genetic material of the offspring, and the sperm cells act only as stimulators in order for the egg to start development. This technique has several applications, both in aquaculture and in biological research: gynogenetic fish may be used as a step in the production of all‐female populations, the production of isogenetic‐ and inbred lines, revealing of the sex determination mechanism, construction of genetic maps, and testing of environmental vs genetic control of different traits. The aim of this study was to develop a simple protocol for production of gynogenetic cod (Gadus morhua L.) for further use in aquaculture research. Various milt dilutions and UV‐irradiation doses were tested, in order to inactivate the sperm without destroying its ability to induce egg development. This was followed by pressure treatment of the eggs shortly after ‘fertilization’ to suppress the completion of meiosis II, and thereby restoring diploidy. A dose of 9000 erg mm−2, followed by a 5‐min pressure treatment (58.6 MPa) 180 min‐degrees after fertilization gave 100% gynogenetic larvae. Histologically, sexual differentiated fish were all females, possibly confirming female homogamety in Atlantic cod. No particular signs of reduced growth, survival or enhanced deformity rates were observed after the fish had reached the juvenile phase. Mortality was, however, high during the egg and larval stages. This protocol has made capable the production of gynogenetic cod juveniles in significant amounts using relatively simple means; the next step will be to elaborate on the technique in order to produce mitotic gynogenetic (double haploid) individuals, which are 100% homozygous.
Journal of Applied Ichthyology – Wiley
Published: Dec 1, 2011
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