Publications by authors named "H OtterA"
Genetic markers are widely used in fisheries management around the world. While the genetic structure and markers selected are usually based on samples from the wild, very few controlled experiments have been carried out to investigate possible differences in influence on traits between markers. Here we examine the bi-allelic gene pantophysin (Pan I), widely used in the management of Atlantic cod, in a series of crosses under a range of temperatures.
View Article and Find Full Text PDFWild caught North Sea saithe Pollachius virens were monitored for growth, sex steroid profiles and oocyte development pre-spawning and measured for egg size and group fecundity during the spawning season in the laboratory. Vitellogenesis commenced in late October-early November, at a leading cohort size (C ) of c. 250 µm, after which oocytes grew rapidly in size until spawning started in February.
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- - Atlantic cod has various migratory and stationary groups in the North Atlantic, with the Northeast Arctic cod (NEAC) migrating for spawning, while neighboring Norwegian coastal cod (NCC) remain stationary.
- - Research reveals that genetic differences between NEAC and NCC are maintained due to specific chromosomal inversions that inhibit genetic mixing, located in a 17.4-Mb region on linkage group 1.
- - A NEAC-specific haplotype linked to adaptations for long migrations contains 763 genes related to swim bladder function, oxygen levels, and muscle organization, showing that natural selection drives these differences despite the two populations interbreeding.
The detection rates of stationary acoustic transmitters deployed at three depths on two Atlantic salmon Salmo salar cage farms for c. 2 months were investigated. Deployment depth, time of day, day of the year and specific incidences at the farm substantially affected the rate of signal detection by the receiver.
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