Growth features for pink salmon <i>Oncorhynchus gorbuscha</i> in generations with different survival rate in the marine period of life

There is believed in classical fishery ichthyology, that slower growth can be a reason for decreasing of fish abundance. A sharp decrease occurred recently in the pink salmon abundance on the eastern coast of Sakhalin Island that inspired this study of growth in the pink generations with different survival during the marine period of life. The growth rates were determined using the scale measurements for the pink salmon returned to the southeastern coast of Sakhalin in 2005-2018. The growth parameters (length increments, variability and asymmetry of size composition) were compared with the survival rate of corresponding year-classes. Slower growth coincided with lower survival for feeding fry only, i.e. in the early marine period of pink salmon life. So, the hypothesis is not confirmed about a «crucial size» for salmon juveniles that must be reached until the end of summer-autumn feeding to survive during wintering. That means that previous estimations of size-selective mortality of pink juveniles are not realistic because of both inadequate samplings and reconstructions in size composition during the juveniles growth.

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Growth and movement of the South African abalone Haliotis midae: A reassessment

Marine and Freshwater Research ◽

10.1071/mf9950583 ◽

1995 ◽

Vol 46 (3) ◽

pp. 583 ◽

Cited By ~ 20

Author(s):

RJQ Tarr

Keyword(s):

South African ◽

Growth Rates ◽

Growth Parameters ◽

Eastern Coast ◽

Island Population ◽

Western Coast ◽

Eastern Cape ◽

The South ◽

Significant Difference ◽

Haliotis Midae

Growth rates of a number of Haliotis midae populations around the South African coast were studied by means of tagging. These populations ranged from the cool waters of the western coast to the more temperate environment of the eastern Cape. Standard von Bertalanffy growth curves were fitted and growth parameters derived. These ranged from 0.19 to 0.25 for K, the average rate at which L∞ is approached, and from 156 to 173 for L∞, the average theoretical maximum length. These indicate far higher growth rates than were previously published for this commercially fished species, and the reasons for this difference are discussed. The expectation that growth rates would be fastest in the warmer eastern Cape waters was not realized, there being no significant difference in growth between the Bird Island population on the eastern coast and the Robben Island population on the western coast. These new growth parameters indicate that H. midae in the commercial fishery grounds is attaining sexual maturity some four years earlier, and the minimum legal size some five years earlier, than previously considered. This has considerable significance for modelling studies presently underway. Movement of a small population of adult H. midae was studied over a three-year period, after which 47% of the original abalone were still present on the study site. Of these, 81.5% still occupied exactly the same position on the rocks. This indicates that H. midae that have located an optimum habitat, and that are not disturbed, tend not to move.

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Influence of photoperiod and temperature on timing of sexual maturity of pink salmon (Oncorhynchus gorbuscha)

Canadian Journal of Zoology ◽

10.1139/z88-249 ◽

1988 ◽

Vol 66 (8) ◽

pp. 1729-1732 ◽

Cited By ~ 16

Author(s):

Terry D. Beacham ◽

Clyde B. Murray

Keyword(s):

Temperature Regime ◽

Growth Rates ◽

Sexual Maturity ◽

Pink Salmon ◽

Survival Rates ◽

Oncorhynchus Gorbuscha ◽

Pink Salmon Oncorhynchus Gorbuscha ◽

Males And Females

The effect of two photoperiods and rearing at 10, 13, and 16 °C on the development of pink salmon (Oncorhynchus gorbuscha) maturity 12 to 13 months after fry emergence was examined. Highest rates of maturity for both males and females were observed in the 10 °C temperature regime with a normal first summer, short winter, and short second summer photoperiod. In any environment examined, males were more likely to have matured than females. Highest survival rates and fastest overall growth rates were also observed at 10 °C. The feasibility of transplanting genes from one pink salmon brood line to another is examined.

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Genetic analysis of growth and maturity in pink salmon (Oncorhynchus gorbuscha)

Genome ◽

10.1139/g88-089 ◽

1988 ◽

Vol 30 (4) ◽

pp. 529-535 ◽

Cited By ~ 6

Author(s):

Terry D. Beacham ◽

Clyde B. Murray

Keyword(s):

British Columbia ◽

Genetic Analysis ◽

Growth Rates ◽

Variance Components ◽

Sexual Maturity ◽

Pink Salmon ◽

Genetic Component ◽

Oncorhynchus Gorbuscha ◽

Late Winter ◽

Pink Salmon Oncorhynchus Gorbuscha

Variation in growth and sexual maturity was examined for five stocks of pink salmon (Oncorhynchus gorbuscha) spawning at different times in British Columbia. In each stock, four males were mated with eight females in a nested breeding design, and the juveniles were reared for 500 d after fry emergence. Adults in early-spawning northern stocks were smaller than those in late-spawning southern ones, but pink salmon from northern stocks had faster growth rates than those from southern ones. The relative ranking within stocks of family weight remained constant after late winter in the year of maturity. Heritability of weight based upon sire variance components was usually greater than 0.9 after 150 d of rearing. Pink salmon from the earlier-spawning stocks were in a more advanced state of sexual maturity when the experiment was terminated than were those from later-spawning stocks, indicative of a significant genetic component in timing of sexual maturity.Key words: Oncorhynchus, salmon, growth rates, sexual maturity.

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Gender differences in abdominal aortic aneurysm therapy – a systematic review

VASA ◽

10.1024/0301-1526/a000703 ◽

2018 ◽

Vol 47 (4) ◽

pp. 267-272 ◽

Cited By ~ 9

Author(s):

Konstanze Stoberock ◽

Tilo Kölbel ◽

Gülsen Atlihan ◽

Eike Sebastian Debus ◽

Nikolaos Tsilimparis ◽

...

Keyword(s):

Gender Differences ◽

Abdominal Aortic Aneurysm ◽

Survival Rate ◽

Aortic Aneurysm ◽

Endovascular Treatment ◽

Aortic Aneurysms ◽

Lower Survival Rate ◽

Lower Survival ◽

Abdominal Aortic ◽

Risk Of Rupture

Abstract. This article analyses if and to what extent gender differences exist in abdominal aortic aneurysm (AAA) therapy. For this purpose Medline (PubMed) was searched from January 1999 to January 2018. Keywords were: “abdominal aortic aneurysm”, “gender”, “prevalence”, “EVAR”, and “open surgery of abdominal aortic aneurysm”. Regardless of open or endovascular treatment of abdominal aortic aneurysms, women have a higher rate of complications and longer hospitalizations compared to men. The majority of studies showed that women have a lower survival rate for surgical and endovascular treatment of abdominal aneurysms after both elective and emergency interventions. Women receive less surgical/interventional and protective medical treatment. Women seem to have a higher risk of rupture, a lower survival rate in AAA, and a higher rate of complications, regardless of endovascular or open treatment. The gender differences may be due to a higher age of women at diagnosis and therapy associated with higher comorbidity, but also because of genetic, hormonal, anatomical, biological, and socio-cultural differences. Strategies for treatment in female patients must be further defined to optimize outcome.

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Variation in size distribution of juvenile pink shrimps Farfantepenaeus brasiliensis and F. paulensis in the estuarine-adjacent ocean area of Cananéia, south-eastern coast of Brazil

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315420001393 ◽

2021 ◽

Vol 101 (1) ◽

pp. 117-129

Author(s):

Dalilla da Silva Salvati ◽

Júlia Fernandes Perroca ◽

Sabrina Morilhas Simões ◽

Antonio Leão Castilho ◽

Rogerio Caetano da Costa

Keyword(s):

Development Time ◽

Carapace Length ◽

Growth Parameters ◽

Adult Population ◽

Eastern Coast ◽

Natural Mortality ◽

Juvenile Phase ◽

Juvenile Recruitment ◽

Estuarine Lagoon ◽

Closed Season

AbstractThe study characterized the structure of juveniles and sub-adults of Farfantepenaeus brasiliensis and F. paulensis in the Cananéia-Iguape estuarine lagoon system and its adjacent coastal area by evaluating the period of juvenile recruitment, sex ratio, growth, longevity, natural mortality, and development time until the late juvenile phase. Samples were collected from July 2012 to June 2014. Shrimps were identified by species and sex, and measured (carapace length – CL mm); 889 individuals of F. brasiliensis and 848 of F. paulensis were analysed. Females were more abundant than males for both species. The growth parameters of F. brasiliensis were: CL∞ = 45.5 mm, k = 1.8 year−1 for males and CL∞ = 55.2 mm, k = 1.6 year−1 for females; longevity of 2.52 years (males) and 2.88 years (females); and natural mortality of 1.71 (males) and 1.55 (females). For F. paulensis, the following values were observed: CL∞ = 40.7 mm, k = 2.3 year−1 for males and CL∞ = 56.5 mm, k = 1.9 year−1 for females; longevity of 2.04 years (males) and 2.37 years (females); and natural mortality of 2.39 (males) and 2.05 (females). The juvenile recruitment of both species peaked in January 2014. The development time until late juvenile phase was ~7 months (F. brasiliensis) and ~5 months (F. paulensis). Even though the highest abundance of juveniles did not occur in the closed season, fishing is forbidden in the estuarine area and the migration towards the adult population occurred close to or even during the closed season.

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