Results 131 to 140 of about 1,350 (175)
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Sexual Maturation in Kokanee Oncorhynchus nerka
Northwest Science, 2008We used observational and experimental approaches to obtain information on factors affecting the timing of maturation of kokanee Oncorhynchus nerka, a semelparous, landlocked salmon. Gonadal staging criteria were developed and applied to three kokanee populations in Idaho lakes and reservoirs.
Scott D. Patterson +2 more
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Allozyme variability of Oncorhynchus nerka in Japan
Ichthyological Research, 2000We examined allozymic variation in 65 protein-coding loci in three samples of sockeye salmon (Oncorhynchus nerka) from Hokkaide, and Honshu, Japan, Over-all, six variable loci were seen and each of the three samples was variable at 3–5 loci. Two loci,mAH-1,2* andALAT*, were variable at the P0,95 level. Average heterozygosity ranged from 0.012 to 0.013,
Gary A. Winans, Shigehiko Urawa
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Fine structure of the adenohypophysis in immature sockeye salmon, Oncorhynchus nerka
Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1973The ultrastructure of the secretory cells of the adenohypophysis of juvenile sockeye salmon was investigated. Pituitary glands were collected from immature fish transferred experimentally to sea water and subsequently returned to fresh water. The rostral pars distalis contained three cell types: ACTH cells, prolactin cells, and non-secretory cells. The
B A, McKeown, J F, Leatherland
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cDNA for Ribosomal Protein S2 in Sockeye Salmon, Oncorhynchus nerka
Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 1997We isolated a cDNA encoding ribosomal protein S2 in sockeye salmon, Oncorhynchus nerka, using a reverse transcriptase-polymerase chain reaction (RT-PCR) method. The cDNA encoding ribosomal protein S2 is composed of 933 nucleotides, and has a 5'-noncoding sequence of 9 bases, a 885 base open reading frame coding for a 294 amino acid polypeptide, and a ...
S, Hiraoka +4 more
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Liver arginase activity in the sockeye salmon, Oncorhynchus nerka
Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1971Abstract 1. 1. Liver arginase levels in adult sockeye salmon show characteristics similar to that of higher animals. 2. 2. Results show that sockeye liver arginase has a pH optimum of 9·5, is partially dependent on Mn2+ ions and has a temperature optimum of 45°C.
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Journal of Ichthyology, 2009
Data on the present-day (2003–2007) state of the population of kokanee Oncorhynchus nerka introduced in Tolmachevskoe Lake more than 20 years ago are provided. Since the moment of introduction, the population of kokanee has underwent considerable changes: a decrease occurred in the specific rate of growth, average length and weight of fish in catches ...
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Data on the present-day (2003–2007) state of the population of kokanee Oncorhynchus nerka introduced in Tolmachevskoe Lake more than 20 years ago are provided. Since the moment of introduction, the population of kokanee has underwent considerable changes: a decrease occurred in the specific rate of growth, average length and weight of fish in catches ...
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1994
The study has shown through life history examination and DNA analysis that three forms of O. nerka are present in Redfish Lake. The three forms are closely related, but may be sufficiently different to be considered three separate stocks. Fishhook Creek kokanee are temporally isolated from the beach spawners, and may represent the gene pool most ...
E.L. Brannon +2 more
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The study has shown through life history examination and DNA analysis that three forms of O. nerka are present in Redfish Lake. The three forms are closely related, but may be sufficiently different to be considered three separate stocks. Fishhook Creek kokanee are temporally isolated from the beach spawners, and may represent the gene pool most ...
E.L. Brannon +2 more
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THE LIFE HISTORY OF A DRACUNCULOID, PHILONEMA ONCORHYNCHI, IN ONCORHYNCHUS NERKA
Canadian Journal of Zoology, 1967The life cycle of Philonema oncorhynchi was studied by infecting Cyclops bicuspidatus with larvae obtained from gravid female worms in spawning salmon and by subsequent infection of hatchery-reared salmon fingerlings. Later development of the worms was observed in naturally infected fingerling sockeye salmon maintained in fresh water for 2 years ...
Edward G. Platzer, James R. Adams
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Osmoregulatory capability in juvenile sockeye salmon (Oncorhynchus nerka)
Canadian Journal of Zoology, 1971The osmoregulatory capability of sockeye salmon (Oncorhynchus nerka) embryos and fry was tested at weekly intervals by exposing them for 5 days to seawater with a salinity of 29‰. Juveniles that survived the 5-day test were considered to be euryhaline.
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HISTOLOGY AND HISTOCHEMISTRY OF THE PINEAL ORGAN IN THE SOCKEYE SALMON, ONCORHYNCHUS NERKA WALBAUM
Canadian Journal of Zoology, 1967The morphohistology and some histochemical aspects of the pineal organ in the sockeye salmon were studied. The distal part of the organ lies in a pineal fossa in the cranial roof. Photosensory cells and two kinds of ependymal supporting cells are present throughout its epithelium, which is entirely devoid of either melanin or lipofuchsin.
M A, Hafeez, P, Ford
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