scholarly journals Age composition of Chukchi sockeye salmon Oncorhynchus nerka

2014 ◽  
Vol 179 (4) ◽  
pp. 10-31
Author(s):  
Elena V. Golub’
Keyword(s):  
Sockeye Salmon ◽  
Natural Habitat ◽  
Age Groups ◽  
River System ◽  
Brood Stock ◽  
Age Composition ◽  
Kokanee Salmon ◽  
Spawning Areas ◽  
Reproductive Part

Long-term data on age composition for Chukchi populations of sockeye salmon are presented. Spawners of 23 ages are recognized in the period 1970-2013 for 10 populations: 2+, 3+, 0.1+, 0.2+, 0.3+, 0.4+, 0.5+, 1.1+, 1.2+, 1.3+, 1.4+, 1.5+, 2.1+, 2.2+, 2.3+, 2.4+, 2.5+, 3.1+, 3.2+, 3.3+, 3.4+, 4.2+, and 4.3+. The brood stock basis is formed by five- and six-year fish of 1-2-year freshwater feeding and 3-year marine feeding. The greatest diversity in the age composition is observed at the northern limit of the Asian sockeye salmon natural habitat - i.e. in the Seutakan and Achchen lake-river systems. The spawners dropped into the sea at the age of 0+ and 1+ years are more common in the populations with prevailing limnophilous forms of sockeye (rivers Khatyrka, Tumanskaya and Anadyr, Seutakan lake-river system), and the spawners dropped at the age 2+ and 3+ years - in the populations with domination of its rheophilous form (Meinypilgyn lake-river system, Orianda and Amaam lagoons). As compared with the sockeye salmon from central spawning areas of the habitat, the Chukchi sockeye has more complicated age composition of reproductive part of stocks, greater duration of marine feeding, females predominance among fast-maturing fish returning after 2 years of marine life, higher portion of males in senior age groups, and minor level of kokanee salmon and jacks. Brief description of spawning and/or feeding ponds for Chukchi sockeye salmon is presented.

Demography and life cycle of Antarctic krill, Euphausia superba, in the Indian sector of the Southern Ocean: long-term comparison between coastal and open-ocean regions

2000 ◽  
Vol 57 (S3) ◽  
pp. 68-90 ◽  
Author(s):  
E A Pakhomov
Keyword(s):  
Southern Ocean ◽  
Life Span ◽  
Antarctic Krill ◽  
Age Groups ◽  
Substantial Reduction ◽  
Euphausia Superba ◽  
Age Composition ◽  
Indian Sector ◽  
Antarctic Krill Euphausia Superba

Size/age composition and reproductive status of Antarctic krill, Euphausia superba, in the central part of the Indian sector of the Southern Ocean, e.g., the Cooperation Sea (Prydz Bay region) and the Cosmonaut Sea, during austral summers 1977-1990 were summarized to estimate growth rates, longevity, reproduction, recruitment, life span, and mortality rates. The life span of Antarctic krill exceeds 5 years in both the Cosmonaut and Cooperation seas. The age composition of the southern and northern groupings differs markedly, with substantial reduction in numbers of early age groups in the northern grouping. Long-term observations of spawning success, recruitment, and age composition suggest that a self-sustained grouping of krill persists in the Cooperation Sea south of the Antarctic Divergence. However, periodic gene flow via recruits from surrounding regions most probably accounts for the lack of spatial genetic differences between the Cooperation Sea and adjacent areas, thus preventing the establishment of an isolated subpopulation in the region investigated. The major factor responsible for the substantial interannual variability in krill dynamics appears to be macroscale oceanographic and atmospheric circulations, which determine a level of environmental isolation of the Cooperation Sea from adjacent waters.

Skeena River Sockeye Escapement and Distribution

1952 ◽  
Vol 8c (7) ◽  
pp. 453-468 ◽  
Author(s):  
J. R. Brett
Keyword(s):  
Sockeye Salmon ◽  
River System ◽  
The Other ◽  
Population Estimates ◽  
Commercial Fishery ◽  
Actual Number ◽  
Spawning Areas ◽  
Skeena River ◽  
Best Estimates ◽  
Spawning Streams

Population estimates made from observations on the number of sockeye salmon in the various spawning streams of the Skeena River, B.C., during the period 1944–48 are presented. The methods used include a fence count at Babine Lake, the most important spawing area, supplemented by stream counting in the other areas and sample tagging at Lakelse. Estimates made at Babine by the latter methods were compared with the fence counts; the stream count estimates were about one-third of the actual number present, whereas estimates from tagging were about twice the actual.A brief description of the spawning streams of the Skeena is accompanied by a map showing their location. Best estimates of 1946–47 escapements to major spawning areas are: Babine, 480,000; Morice, 70,000; Bear, 42,000; Lakelse, 29,000. These comprise 92 per cent of the total for the river system. The area of the spawning beds used by sockeye in the system is about 100 acres, or of the order of 1.5 square yards per spawning pair. The division of the whole run is approximately 45 per cent to the commercial fishery, 6 per cent to the Indian fishery, and 49 per cent escapement.

scholarly journals Age and length-weight structure of local stocks of sockeye salmon Oncorhynchus nerka in some feeding-spawning lakes of Kamchatka Region

2015 ◽  
Vol 180 (1) ◽  
pp. 3-38
Author(s):  
Alexander V. Bugaev ◽  
Victor F. Bugaev ◽  
Evgeny G. Pogodaev
Keyword(s):  
Time Series ◽  
Sockeye Salmon ◽  
Age Groups ◽  
Southeastern Kamchatka ◽  
Kamchatka Region ◽  
Cyclic Variations ◽  
Weight Structure ◽  
The Common ◽  
Bering Island

Age and length-weight structure of sockeye salmon spawners are considered for the feeding-spawning lakes of southeastern Kamchatka, as Dalneye (1976-2013), Blizhneye (1939-2013), and Listvenichnoye (1999-2013), and for Lake Sarannoye on Bering Island (1990-2013). By these data, the age of sockeye salmon maturing is: 2.2, 2.3 and 3.2 in Lake Dalneye, 1.2, 1.3, 2.1 and 2.2 in Lake Blizheye, 2.2, 2.3 and 3.3 in Lake Listvenichnoye, and 2.2, 2.3, 3.2 and 3.3 in Lake Sarannoye. These age groups dominate in the samples of spawning sockeye with the portion 70-90 %. Long-term dynamics of length and weight of sockeye spawners is distinguished by negative trends significant for the longest time-series in Lake Blizhneye and insignificant for the shorter one in Lakes Dalneye; the length of observations in Lakes Listvenichnoye and Sarannoye is not enough to reveal trends. Besides, cyclic variations with the period 5-10 years could be revealed for the long tome-series. As a rule, each cycle includes the phases of gradual decreasing and sharp increasing of length and weight. Year-to-year dynamics of the length-weight structure in the common period of observations is similar for all investigated lakes.

Density, climate, and the processes of prespawning mortality and egg retention in Pacific salmon (Oncorhynchus spp.)

2007 ◽  
Vol 64 (3) ◽  
pp. 574-582 ◽  
Author(s):  
T P Quinn ◽  
D M Eggers ◽  
J H Clark ◽  
H B Rich, Jr.
Keyword(s):  
Sockeye Salmon ◽  
Pacific Salmon ◽  
River System ◽  
Retention Rates ◽  
Bristol Bay ◽  
Egg Retention ◽  
Limited Sampling ◽  
Egg Deposition ◽  
Two Factors

In 2004 and 2005, exceptionally large runs of sockeye salmon (Oncorhynchus nerka) to the Alagnak River system in Bristol Bay, Alaska, coincided with weak runs to the nearby Kvichak River system. Restricted fishing to protect the Kvichak populations resulted in densities on the Alagnak River system's spawning grounds that were 11.5-fold (in 2004) and 9.0-fold (in 2005) above the long-term (1956–2003) average. Carcass sampling indicated that 23% (2004) and 44% (2005) of the potential egg deposition was lost to prespawning mortality or incomplete spawning in the Alagnak populations. Much lower levels of egg retentions were observed in spawning populations in the Kvichak River and Wood River systems, where the runs did not appreciably exceed the escapement goals, indicating that density-dependent spawning failure may have occurred. However, in 2005, significantly higher egg retention rates were observed in the Alagnak River system despite slightly lower densities than in 2004, indicating that environmental processes (probably low river levels and high temperatures) influenced prespawning mortality as well. More limited sampling in 2006 revealed only 3% egg retention in one of the Alagnak populations, but the combination of lower density and cooler conditions did not allow us to determine the relative contributions of these two factors to spawning failure.

Effects of population-specific variation in age and length on fishery selection and exploitation rates of sockeye salmon (Oncorhynchus nerka)

2009 ◽  
Vol 66 (6) ◽  
pp. 896-908 ◽  
Author(s):  
Neala W. Kendall ◽  
Thomas P. Quinn
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Age Groups ◽  
River System ◽  
Directional Selection ◽  
Size At Maturity ◽  
Natural Processes ◽  
Fishery Exploitation ◽  
Specific Variation ◽  
Complex Variation

Conspecific salmonid populations often differ in age and body size at maturity, and these differences can cause fishery exploitation rates and patterns of directional selection on size to vary among populations. Based on age and length data on five representative spawning populations of sockeye salmon ( Oncorhynchus nerka ) in the Wood River system, Bristol Bay, Alaska, USA, we estimated exploitation rates and population-specific patterns of selection from a gillnet fishery between 1963 and 2007. Exploitation rates have differed among age groups and have varied greatly over time, likely due to changes in fishery selectivity. Populations with older, larger fish were more heavily exploited than populations with small, young fish. Differential fishery selection was detected among the populations, linked to persistent differences in size and age of fish among the populations. Specifically, we found evidence of stronger size selectivity on populations with smaller-bodied fish and less directional selection on populations dominated by larger-bodied fish. These results reveal the complex variation in the intensity and selectivity of fishing that can result from exploitation of populations that differ in age and size at maturity and shape. Evolutionary responses to this selection may be taking place, but natural processes provide countervailing selection.

Basic principles for assessing the safety of fish products from the ponds exposed to the influence of nuclear fuel cycle enterprises

2019 ◽  
pp. 106-114
Author(s):  
A. V. Trapeznikov ◽  
V. N. Trapeznikova ◽  
A. V. Korzhavin ◽  
V. N. Nikolkin ◽  
A. P. Plataev
Keyword(s):  
Fuel Cycle ◽  
Specific Activity ◽  
River System ◽  
Food Product ◽  
Human Consumption ◽  
Basic Principles ◽  
Fish Products ◽  
Permissible Levels ◽  
Irtysh River

Relevance. In connection with the development of nuclear energy, many aquatic ecosystems have been exposed to radioactive substances. Fish, as an element of biota, is capable to accumulate radionuclides. However, fish is a traditional food. The control of the technogenic radionuclides accumulation level in the ichthyofauna is an important link in ensuring human security.Intention. To analyze the long-term data on the content of long-lived technogenic radionuclides 90Sr and 137Cs in the ichthyofauna of the Ob-Irtysh river system for the period from 2004 to 2016 and Beloyarsky pond for the period from 1977 to 2018.Methodology. Fish as a food product was assessed according to two criteria: a) permissible levels of specific activity of radionuclides (SanPiN 2.3.2.1078-01); b) using the indicator of conformity B and the uncertainty of its definition В (GOST 32161-2013 and GOST 32163-2013).Results and Discussion. Fish of all species that live in the river Tetcha, is not suitable for food use according to the criteria of SanPiN 2.3.2.1078-01, GOST 32161-2013 and GOST 32163-2013. The fish of the Ob-Irtysh river system, the habitat of which is located outside the Tetcha, meets the requirements for fish products. In the period from 1977 to 1989 in the Beloyarsk pond the accumulations of technogenic radionuclides in fish in quantities exceeding sanitary and hygienic standards were possible. Currently, the fish of the Beloyarsky pond fully complies with the sanitary and hygienic requirements for the radiation factor and is safe for human consumption.Conclusion. In the ponds exposed to the atomic energy enterprises, it is necessary to continuously monitor the content of long-lived technogenic radionuclides in fish and assess their amount in accordance with the requirements of SanPiN 2.3.2.1078-01 and using the conformity indicator В and the uncertainty of its determination В. 

COVID - 19 AND THE PROBLEM OF PERSONALITY

2020 ◽  
pp. 31-35
Author(s):  
Mazaeva N.A. ◽  
Golovina A.G.
Keyword(s):  
General Population ◽  
Age Groups ◽  
Personal Transformation ◽  
Personality Changes ◽  
Age Dependent

In order to determine possible trends in the dynamics and characterological structure of personality in the General population caused by the COVID-19 pandemic, which is a long-term strong stressful effect and clinically and psychopathologically comparable to chronic personality changes after experiencing a disaster, the conditions predisposing to personal transformation, including clinical and prognostic patterns, are analyzed. The age-dependent nature of these changes is shown, and a number of features identified for different age groups are discussed.

River Quality Models for Consent Setting in England and Wales

1989 ◽  
Vol 21 (8-9) ◽  
pp. 1015-1024 ◽  
Author(s):  
C. P. Crockett ◽  
R. W. Crabtree ◽  
I. D. Cluckie
Keyword(s):  
River System ◽  
Quality Model ◽  
Catchment Scale ◽  
Quality Models ◽  
England And Wales ◽  
Future Developments ◽  
Statistical Framework ◽  
River Quality ◽  
National Approach

In England and Wales the placing of effluent discharge consents within a statistical framework has led to the development of a new hybrid type of river quality model. Such catchment scale consent models have a stochastic component for the generation of model inputs and a deterministic component to route them through the river system. This paper reviews and compares the existing approaches for consent modelling used by various Water Authorities. A number of possible future developments are suggested including the potential need for a national approach to the review and setting of long term consents.

scholarly journals The Quality of Life and Satisfaction with Continuous Glucose Monitoring Therapy in Children under 7 Years of Age with T1D Using the rtCGM System Integrated with Insulin Pump—A Caregivers Point of View

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3683
Author(s):  
Ewa Rusak ◽  
Natalia Ogarek ◽  
Karolina Wolicka ◽  
Anna Mrówka ◽  
Sebastian Seget ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Insulin Pump ◽  
Age Groups ◽  
Glucose Monitoring ◽  
Point Of View ◽  
Therapy Assessment ◽  
Monitoring Therapy ◽  
Original Survey

Quality of life (QoL) is an important parameter that affects the choice of therapy. Assessment of QoL and satisfaction with therapy using the rtCGM in children with T1D aged < 7 years was conducted. The study group consisted of 38 children with T1D aged < 7 years (34% aged 2–4, 66% aged 5–7 years), HbA1c: 6.53 ± 0.63%, duration of diabetes: 2.6 ± 1.6 years, treated with an rtCGM-augmented insulin pump for 1.92 ± 1.15 years. Two anonymous surveys were conducted: a. PedsQL3.0 diabetes standardized questionnaire—QoL assessment among age groups: 2–4/5–7 years. b. An original survey assessing the CGM use satisfaction. The mean scores in PedsQL3.0: communication 75%, worries 30%, treatment 70%, and problems associated with diabetes 65%. The QoL scale is: 0–19% very low, 20–39% low, 40–59% moderate, 60–79% high, 80–100% very high. The most frequently reported concerns were long-term diabetes complications and prick pain. Satisfaction with CGM use was high (68% in group aged 5–7 and 92% 2–4 years). Twenty-seven (71%) caregivers confirmed the positive effect of CGM on sleep. During the use of rtCGM a high quality of life was reported, and the quality of sleep in their caregivers was increased.

scholarly journals Survival Associations between Patient Age and Treatment Modality in Olfactory Neuroblastoma: A Retrospective Population-Based Study

2021 ◽  
Vol 10 (12) ◽  
pp. 2685
Author(s):  
Andre J. Burnham ◽  
Phillip A. Burnham ◽  
Edwin M. Horwitz
Keyword(s):  
Treatment Modality ◽  
Age Groups ◽  
Olfactory Neuroblastoma ◽  
Population Based ◽  
Treatment Modalities ◽  
Long Term Outcomes ◽  
Patient Age ◽  
Population Based Study ◽  
Patient Âgé

Olfactory neuroblastoma (ONB) is a rare neuroepithelial-derived malignancy that usually presents in the nasal cavity. The rarity of ONB has led to conflicting reports regarding associations of patient age and ONB survival and outcome. Moreover, long-term outcomes of chemotherapy and other treatment modalities are speculated. Here, we aimed to compare survival outcomes across age groups through time and determine associations between treatment modality and survival. In this retrospective population-based study, we analyzed the SEER 2000–2016 Database for patients with ONB tumors. Using Kaplan–Meier survival analysis, a significant effect of age and cancer-specific survival (CSS) was observed; geriatric ONB patients had the lowest CSS overall. Generalized linear models and survival analyses demonstrated that CSS of the pediatric patient population was similar to the geriatric group through 100 months but plateaued thereafter and was the highest of all age groups. Radiation and surgery were associated with increased CSS, while chemotherapy was associated with decreased CSS. GLM results showed that tumor grade, stage and lymph node involvement had no CSS associations with age or treatment modality. Our results provide insight for future investigations of long-term outcomes associated with ONB patient age and treatment modality, and we conclude that survival statistics of ONB patients should be analyzed in terms of trends through time rather than fixed in time.

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