LENGTH-WEIGHT STRUCTURES AND FECUNDITY OF ANADROMOUS MASU SALMON (ONCORHYNCHUS MASOU) FROM WESTERN KAMCHATKA

2021 ◽  
pp. 74-87
Author(s):  
O.A. Zakharova ◽  
◽  
S.M. Zudina ◽  
Keyword(s):  
Pacific Salmon ◽  
Masu Salmon ◽  
Oncorhynchus Masou ◽  
Western Kamchatka ◽  
The Pacific ◽  
Northern Border ◽  
Thermophilic Species ◽  
Mature Fish ◽  
Masu Salmon Oncorhynchus Masou ◽  
Weight Structures

Masu salmon Oncorhynchus masou is the most thermophilic species among the Pacific salmon, and Kamchat-ka peninsula is the northern border of its distribution. Due to small abundance, the biology of this species on the peninsula is poorly studied. Regular scientific researches of Masu salmon in Kamchatka have been con-ducted since 2009. The length-weight structures and fecundity of mature Masu salmon have been analyzed in several streams on western Kamchatka over a 10-year period (from 2009 to 2018) and present time. It has been established that the length, weight and fecundity of mature fish are different in the rivers of the peninsula. A tendency of increasing the biological characteristic of the species in recent years has been noted.

Reproduction ecology of masu salmon Oncorhynchus masou in the Kol basin (Western Kamchatka)

2009 ◽  
Vol 49 (6) ◽  
pp. 441-453 ◽  
Author(s):  
K. V. Kuzishchin ◽  
A. M. Malyutina ◽  
M. A. Gruzdeva ◽  
K. A. Savvaitova ◽  
D. S. Pavlov
Keyword(s):  
Masu Salmon ◽  
Oncorhynchus Masou ◽  
Western Kamchatka ◽  
Masu Salmon Oncorhynchus Masou ◽  
Reproduction Ecology

Changes of serum growth hormone and vitellogenin levels during vitellogenesis in female masu salmon Oncorhynchus masou

2000 ◽  
Vol 66 (4) ◽  
pp. 789-791 ◽  
Author(s):  
Haruhisa Fukada ◽  
Naoshi Hiramatsu ◽  
Makiko Kitamura ◽  
Munetaka Shimizu ◽  
Akihiko Hara
Keyword(s):  
Growth Hormone ◽  
Masu Salmon ◽  
Oncorhynchus Masou ◽  
Serum Growth Hormone ◽  
Masu Salmon Oncorhynchus Masou

Molecular cloning of cDNAs encoding two types of gonadotrophin α subunit from the masu salmon, Oncorhynchus masou: construction of specific oligonucleotides for the α1 and α2 subunits

1993 ◽  
Vol 11 (3) ◽  
pp. 265-273 ◽  
Author(s):  
K Gen ◽  
O Maruyama ◽  
T Kato ◽  
K Tomizawa ◽  
K Wakabayashi ◽  
...  
Keyword(s):  
Amino Acids ◽  
Structural Difference ◽  
Structural Features ◽  
Masu Salmon ◽  
Time Interval ◽  
Oncorhynchus Masou ◽  
Α Subunit ◽  
Polymerase Chain ◽  
Fossil Records ◽  
Masu Salmon Oncorhynchus Masou

ABSTRACT Two types of cDNA (GTHα1 and -α2) encoding the α subunits of masu salmon (Oncorhynchus masou) gonadotrophin were cloned by the reverse transcription-polymerase chain reaction for pituitary mRNAs. The nucleotide sequences showed that the GTHα1 cDNA was 380 bp long, encoding 119 amino acids, and that GTHα2 cDNA was 365 bp long, encoding 114 amino acids. The masu salmon α subunit types had a few differences between the sequences, with homologies of 80% (nucleotide sequence) and 72% (amino acid sequence). The structural difference between the α1 and α2 subunits was predicted using hydropathic analysis. The evolutionary interval between masu and chum salmon was estimated to be 4·0 and 2·3 million years by comparing their GTHα1 and -α2 subunits respectively. These time values are roughly consistent with the evolutionary time interval (3·0 million years) estimated from fossil records and an isozyme study. Specific synthetic oligonucleotide probes were constructed and used for genomic Southern blot analyses. The restriction fragment sizes of the GTHα1 and -α2 genes were similar, and when their patterns were compared with those from four other teleosts, each species showed a different pattern from the others, but no difference between their respective α1 and α2 genes. Therefore, the structural features of the GTHα1 and -α2 genes may have diverged in a similar manner in these five teleosts.

Sign in / Sign up

Export Citation Format

Share Document