By Robert J. Wootton, Carl Smith
Reproductive Biology of Teleost Fishes is the 1st built-in assessment of the reproductive biology of the bony fishes, that are the main species-rich and different team of vertebrates. Teleosts reveal awesome version of their modes of copy, and this quantity is meant to supply a framework for realizing the amazing reproductive variety of this team. It describes their reproductive biology utilizing, at any place attainable, phylogenetic analyses and life-history conception as a way to interpret the data. The ebook addresses the genetic, physiological, behavioural, ecological, evolutionary and utilized features of teleost replica in a comparative framework that emphasises the adaptive foundation of reproductive diversity.
Reproductive Biology of Teleost Fishes offers a accomplished synthesis of fish replica that might be of significant curiosity to lifestyles scientists, really ecologists, evolutionary biologists, physiologists and complicated undergraduates, postgraduates and examine staff requiring a entire evaluation of fish copy. The publication is appropriate for classes in fish biology and ecology, reproductive body structure and reproductive genetics. It additionally addresses utilized questions and should be of worth for classes on fisheries technological know-how and aquaculture. Libraries in all universities and learn institutions the place organic sciences, fisheries technology and aquaculture are studied and taught must have a number of copies of this significant publication on their cabinets.
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Extra info for Reproductive Biology of Fishes
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2009). Morphologically distinct sex chromosomes are rare. They have been identified in sockeye salmon (Oncorhynchus nerka, Salmonidae), rainbow trout (Oncorhynchus mykiss, Salmonidae), lake trout (Salvelinus namaycush, Salmonidae) and brook trout (Salvelinus fontinalis, Salmonidae). However, not all populations of O. mykiss show visible heteromorphic sex chromosomes. In O. nerka, the diploid number of chromosomes in males is 57, whereas in females it is 58. In males, the Y chromosome has fused with an autosome.
In O. niloticus (XX–XY), no significant deviations from a balanced sex ratio were obtained over the temperature range 20–33 °C, but at 35–37 °C, there was a significant skew to male-biased ratios. A strength of these studies was that the analysis eliminated the confounding effect of sex-selective mortality. Again, families raised at the same temperature showed different ratios, indicating a parental genetic effect in addition to the effect of temperature. In O. aureus ZZ–ZW, a masculinising effect was obtained at a rearing temperature of 35 °C, and also, but to a lesser extent, with a daily temperature cycle of between 27 and 35 °C.
The aquaculture industry would prefer to rear all-female cohorts because of the better growth and larger size of the females – hence the interest in the mechanism of sex determination in this species. For D. , 2012). , 2012). , 2012). Breeding experiments using D. , 2007). The data were compatible with a polygenic model of sex determination, but with some of the variability in sex ratios reflecting environmental effects (see ‘Environmental sex determination in teleosts’). An interpretation of the results for D.