Blar i Faculty of Biosciences (BioVit) på forfatter "Gjøen, Hans Magnus"
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Analysis of crosses between three strains of striped catfish (Pangasianodon hypophthalmus) in Viet Nam
Tran, Phuc Huu (Master thesis, 2016-08-18)This study focused on harvest body weight of striped catfish (Pangasianodon hypophthalmus) in a selective breeding program in Vietnam. The first objective was to estimate additive, non-additive genetic effects and heritability ... -
Breeding for disease resistance against Edwardsiella ictaluri in Mekong striped catfish (Pangasianodon hypophthalmus)
Pham, Khoi Dinh (PhD Thesis;2020:77, Doctoral thesis, 2020)Bacillary necrosis (BN) is a disease caused by Edwardsiella ictaluri (E. ictaluri) that results in severe economic losses in farming of Mekong striped catfish (Pangasianodon hypophthalmus) in Vietnam. Genetic selection ... -
Development and evaluation of 4-way crossbred chicken population in Southern Ethiopia
Ambaye, Fassil Bekele (PhD Thesis;2010:46, Doctoral thesis, 2010)Village chickens in Ethiopia are predominantly indigenous. They play an important role in the livelihood of farmers mainly by providing animal protein through meat and egg, as a source of income and family saving, and means ... -
Effect of short time temperature alteration on two key reproduction hormone levels of Nile tilapia (Oreochromis niloticus)
Sultana, Nowshim (Master thesis, 2020)This study investigates the effects of rapid and short temperature change on the levels of the hormones testosterone and estradiol-17β and the subsequent effect on egg maturation in Nile tilapia (Oreochromis niloticus). ... -
Establishment of a base population for long-term genetic improvement of Nile tilapia in Ethiopia
Workagegn, Kassaye Balkew (PhD Thesis;2019:8, Doctoral thesis, 2019)The success of genetic improvement obtained in fish breeding programs depends on the genetic diversity of the founder populations and how the base population is constructed, as they influence the genetic variation of the ... -
Estimation of genetic parameters and strain genetic effects in Oreochromis mossambicus
Das, Koushik (Master thesis, 2019)A breeding program for Oreochromis mossambicus has been established by CEPAQ (Centro de Pesquisa em Aquacultura, translated as The Research Centre in Aquaculture) and is intended to develop the local fish farming industries ... -
Genetic parameters and response to selection for body weight, fillet traits, body size traits and survival in Nile Tilapia (Oreochromis niloticus)
Gulzari, Benan (Master thesis, 2017)This study evaluates the genetic parameters and selection responses in relation to harvest body weight, fillet yield, fillet weight, body size traits (length, depth, thickness) and survival of GenoMar Supreme Tilapia (GST™) ... -
Genetic studies on improvement of striped catfish (Pangasianodon hypophthalmus) for economically important traits
Nguyen, Sang van (PhD Thesis;2010:43, Doctoral thesis, 2010)The aim of this study was to find non-invasive methods for measuring fillet weight, fillet yield and fillet fat on striped catfish (Pangasianodon hypophthalmus), to examine the magnitudes of genetic variance and covariance ... -
Melanin-based skin pigmentation and stress in Atlantic salmon (Salmo salar)
Thorsen, David Krokedal (Master thesis, 2019-05-12)Anybody who has studied, fished for, handled, or consumed Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) will have noticed that the skin of these fishes is typically dappled with black spots. In ... -
Non-additive genetic effects in Nile tilapia
Joshi, Rajesh (PhD Thesis;2018:101, Doctoral thesis, 2018)Nile tilapia (Oreochromis niloticus) is the world’s fastest growing aquaculture species, in terms of annual increase in production (ca 10%) and is today produced world-wide. Most of the commercial and farmed Nile tilapia ... -
Reproductive and Genetic Studies in Large Yellow Croaker
Yu, Xinxiu (Doctoral thesis, 2021-12-15)Large yellow croaker (Larimichthys crocea) is distributed in the coastal regions of East Asia and is one of the most important marine aquaculture species in China. However, due to overfishing, it has been difficult to ... -
Statistical model comparison in genetic analysis of challenge test data on Streptococcus agalactiae resistance in Nile tilapia (Oreochromis niloticus)
Lin, Meng (Master thesis, 2016-08-09)Five statistical models were used to analysis genetic variations, heritability and the ability to predict survival of Nile tilapia based on challenge test data. 12 full-sib Nile tilapia families (1870 individuals) with an ... -
The domestication of Oreochromis mossambicus in a breeding program in Mozambique
Torres Arjona, Guillermo (Master thesis, 2018)This study describes the establishment of a baseline and a base camp for the development of a genetic enhancement program for the Mozambique tilapia, Oreochromis mossambicus, with the scope of utilising both additive and ... -
The neural basis of threat-sensitive behaviour in fish
Silva, Patricia Isabel Mota (PhD Thesis;2015:6, Doctoral thesis, 2020-11-10)Fear, or threat-sensitive behaviour, is an emotionally guided response allowing animals to minimize exposure to potential danger. Stress is a set of physiological/behavioural responses to such exposure. Among other ... -
Variation at early life stages of Atlantic salmon : relationships between emergence time and stress coping styles
Serrano, Jonathan David Vaz (PhD Thesis;2011:08, Doctoral thesis, 2011)Captive fish are exposed to a variety of stressful situations, which can affect growth rates and promote diseases. Identification and selection for stress resistant fish at early stages of the production cycle could be ...