scholarly journals NEMATODES OF GENUS PHILONEMA (PHILONEMIDAE) FROM SOCKEYE SALMON AND WHITESPOTTED CHAR FROM LAKE KISI (OLA RIVER BASIN, OKHOTSK SEA)

2019 ◽  
Vol 197 ◽  
pp. 194-207
Author(s):  
V. V. Pospekhov ◽  
K. V. Kusenko
Keyword(s):  
River Basin ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Nematode Species ◽  
Northern Coast ◽  
Okhotsk Sea ◽  
North East ◽  
Salvelinus Leucomaenis ◽  
First Time

Morphology of phylonems infesting whitespotted char Salvelinus leucomaenis and sockeye salmon Oncorhynchus nerka in Lake Kisi at the northern coast of the Okhotsk Sea is described for the first time. Sockeye was infected with adults of Philonema oncorhynchi Kuitunen-Ekbaum, 1933 and larvae of other nematode species (Philonema sp. II), and char — with adult dracunculoid nematode designated as Philonema sp. I. This Philonema sp. I differs considerably from Ph. oncorhynchi by number of reproductive papillae, their distribution, and structure of cuticular appendices on the caudal end of males. Larvae of Philonema sp. I (1st stage) and Philonema sp. II (3rd stage) are described, as well. These new data allow to reconsider the species belonging of nematodes infesting chars (Salvelinus) in North-East of Russia, which are identified now mostly as Ph. oncorhynchi.

YUKAGIR GEOGRAPHICAL TERMS IN TOPONYMY OF THE KOLYMA RIVER BASIN

2020 ◽  
Vol 9 (4(73)) ◽  
pp. 29-33
Author(s):  
N.S. Bagdaryyn
Keyword(s):  
River Basin ◽  
Semantic Analysis ◽  
Comparative Method ◽  
Linguistic Analysis ◽  
Word Formation ◽  
Morphological Features ◽  
North East ◽  
The North ◽  
First Time ◽  
Kolyma River

The article continues the author's research on the toponymy of the North-East of the Sakha Republic, in particular the Kolyma river basin, in the aspect of the interaction of related and unrelated languages. The relevance of this work is defined in the description of local geographical terminology of Yukagir origin, as a valuable and important material in the further study of toponymy of the region. For the first time, the toponymy of the Kolyma river basin becomes the object of sampling and linguistic analysis of toponyms with local geographical terms of Yukagir origin in order to identify and analyze them linguistically. The research was carried out by comparative method, word formation, structural, lexical and semantic analysis. As a result of the research, phonetic and morphological features are revealed, the formation of local geographical terms and geographical names of Yukagir origin is outlined, and previously unrecorded semantic shifts and dialectisms are revealed. The most active in the formation of terms and toponyms is the geographical term iилil / eҕal 'coast‘, which is justified by the representation of the Yukagirs’ coast' home, housing

scholarly journals Relationship between size-weight parameters of soсkeye salmon Oncorhynchus nerka smolts emigrated from Lake Azabachye (Kamchatka River basin) in 1979–2013 and abundance of mature fsh in the sea in 1982–2016

2018 ◽  
Vol 195 ◽  
pp. 128-139
Author(s):  
V. F. Bugaev
Keyword(s):  
Body Weight ◽  
River Basin ◽  
Body Length ◽  
Main Part ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
The Body ◽  
Positive Correlation ◽  
Kamchatka River

Two groups of juvenile sockeye salmon are feeding in Lake Azabachye. They belong to the 2nd order stock of the lake (stock A) and to other 2nd order stocks of middle and down stream tributaries of the Kamchatka River which underyearlings migrate into the lake for feeding and wintering (group E). The main part of the stock A leaves the lake to the sea at the age 2+ (mainly 2.3) and the youngsters of the group E migrate to the sea at the age 1+ (mainly 1.3). The body length and weight parameters of the stock A smolts at the age 2+ and the group E smolts at the age 1+ could be similar or dissimilar in particular years. The maximal difference between the smots of these stocks is observed in the years with higher body length and weight for the stock A. Mean for 1979–2016 length and weight of smolts at abovementioned ages are evaluated as 98.42/87.46 mm and 10.40/7.38 g for the A/E stocks. For the stock A, statistically signifcant positive correlation is noted between size-weight parameters of smolts in the years of emigration and their abundance in the years of mass return. However, the regression has a shift between the periods of emigration/return of 1979–2000/1982–2003 and 2003–2013/2006–2016. The correlation is higher for the frst period (r = 0.820; P < 0.001 for body weight and r = 0.797; P < 0.001 for body length, n = 16) than for the second one with higher abundance (r = 0.669; P < 0.05 for body weight and r = 0.711; P < 0.05 for body length, n = 11). On opposite, the returns of the group E depend weakly on size-weight parameters of its smolts for the period of emigration/return of 1979–1997/1982–2000 (no data for return in 1999) and the dependence is insignifcant for the period of 2000–2013/2003–2016.

THE FIRST FIND OF LEPIDOPHYTE OF THE URSODENDRON GENUS IN СARBONIFEROUS DEPOSITS OF THE VERKHOYANYE (NORTH-EAST OF SIBERIA)

2020 ◽  
pp. 3-7
Author(s):  
A. N. Kilyasov ◽  
Keyword(s):  
New Species ◽  
River Basin ◽  
North East ◽  
Middle Carboniferous ◽  
First Time ◽  
A New Species

For the first time a representative of the Ursodendron Radczenko genus was found in carboniferous deposits of the Verkhoyanya (Upper Yana region or Verkhoyanye). It it revealed in the Setachanskaya Formation of the Middle Carboniferous of the Nyimnecheen River (basin of the Sobolokh-Mayan River) of the Orulgan Range (Northern Verkhoyanye) and is relegated to a new species U. nimnecheenense sp. nov. A description of the new species is given.

Resumption of Feeding by and Survival of Adult Sockeye Salmon (Oncorhynchus nerka) Following Advanced Gonad Development

1963 ◽  
Vol 20 (1) ◽  
pp. 95-100 ◽  
Author(s):  
J. R. McBride ◽  
U. H. M. Fagerlund ◽  
M. Smith ◽  
N. Tomlinson
Keyword(s):  
Fresh Water ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Gonad Development ◽  
The Other ◽  
Green Color ◽  
Force Feeding ◽  
In Captivity ◽  
First Time

Adult, migrating, fasting sockeye salmon (Oncorhynchus nerka) were held in captivity in fresh water without spawning well beyond the time when they would normally have done so and died. A few of the fish were then gonadectomized and force feeding was begun. A few unoperated fish were fed similarly while the remainder served as unoperated, unfed controls. The gonads of the operated fish were well developed. After a period of feeding of about four months some fish in each group had survived. The fed fish had regained their green color and much of their weight and vigor, while the surviving unfed fish were extremely emaciated and listless. At this time voluntary feeding by the force-fed fish was observed for the first time, and it was then found that the five surviving unfed controls would also take food voluntarily. While two of these fish died without apparent improvement in their condition, the other three gradually regained green color, weight and vigor.

Host–Parasite Relationships Between Sockeye Salmon, Oncorhynchus nerka, and Salmincola californiensis (Copepoda: Lernaeopodidae)

1977 ◽  
Vol 34 (2) ◽  
pp. 191-202 ◽  
Author(s):  
Z. Kabata ◽  
B. Cousens
Keyword(s):  
Sockeye Salmon ◽  
Body Wall ◽  
Oncorhynchus Nerka ◽  
Mechanical Damage ◽  
Fork Length ◽  
Parasitic Copepod ◽  
Size Groups ◽  
Branchial Cavity ◽  
Host Parasite ◽  
First Time

The distribution of the parasitic copepod, Salmincola californiensis, on two size-groups (fry, fork length 3.2–5.8 cm; juveniles, fork length 10.2–27.0) of the sockeye salmon, Oncorhynchus nerka, is described. The existence of preferred sites for both groups is established. The distribution on the smaller fish differs from that on the larger in that on the former the copepods are most abundant in the region of pectoral and pelvic fins, whereas on the latter they are by far most common in the branchial cavity. Macroscopic and microscopic mechanical damage to the fish tissues, resulting from the presence and activity of the copepod, comprises injuries to gills, skin, muscle, and even bone. The "burrowing phenomenon" (failure on the part of the copepod to cease excavation of a completed cavity of implantation, resulting in perforation of body wall and penetration of the viscera) is reported upon for the first time.

scholarly journals ON EFFECT OF THE SIZE OF SOCKEYE SALMON ONCORHYNCHUS NERKA SMOLTS ON TIME OF THE SCALE SCLERITE FORMING DURING IMPLEMENTING OF THEIR COMPENSATORY GROWTH IN THE YEAR OF MIGRATION TO THE SEA FROM LAKE AZABACHYE (KAMCHATKA RIVER BASIN)

2018 ◽  
Vol 193 ◽  
pp. 88-98 ◽  
Author(s):  
V. F. Bugaev
Keyword(s):  
Growth Rate ◽  
River Basin ◽  
Sockeye Salmon ◽  
Compensatory Growth ◽  
Oncorhynchus Nerka ◽  
Scale Structure ◽  
Negative Dependence ◽  
Kamchatka River ◽  
Almost All

The Kamchatka River basin is the reproduction area for the secondary large Asian stock of sockeye salmon, one of the most valuable species of pacific salmons. Several major local stocks and groups of minor stocks occupy the basin, the main of them are: i) A — the aboriginal stock in Lake Azabachye (in the lower Kamchatka basin) which juveniles stay two winters in the lake and migrate to sea in the age 2+; ii) E — the transit group of local stocks spawning in the middle and lower tributaries of the Kamchatka which juveniles enter to Lake Azabachye for feeding and wintering and migrate to the sea after the wintering in the age 1+. The latter underyearlings get an additional mark on the scale (less than typical annuli) entering the Lake because of the feeding conditions change. That’s why almost all (90–95 %) juveniles have two zones of dense sclerites (ZDS) when leave Lake Azabachye, no matter of their 2+ or 1+ age. By the measurements in 1979–1987 of the smolts with two ZDS (A + E) in the year of their migration from Lake Azabachye to the sea, each sclerite on scale had formed in 6.61 days, on average, while the smolts staying in the lake for freshwater feeding (with one ZDS) formed each sclerite in 12.00 days, on average. Correspondingly, the migrants had wider distance between the sclerites (4–5 mm), as compared with those of non-migrants (2.0–2.5 mm) (with 150 times magnification). The aboriginal migrants demonstrate the effect of real compensatory growth in the year of emigration that is reflected in the scale structure as wider intersclerite distances. Negative dependence between the size of smolts and rate of their sclerites forming is observed on the data of 1987–2016 for the aboriginal stock A: the bigger the smolts at age 2+, the lower the rate, the longer the time of new sclerite forming, and the narrower the distance between sclerites, and vice versa. This dependence is interpreted as additional environment-dependent adjustment of the growth rate for the smolts with compensatory growth for their better adaptation and survival.

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