Scute structure reveals sex of juvenile and young sturgeon in caviar aquaculture technology

Mapping Intimacies ◽

10.1101/286401 ◽

2018 ◽

Author(s):

Nikolai V. Barulin

Keyword(s):

Sex Determination ◽

Natural Waters ◽

Universal Method ◽

Machine Learning Method ◽

Sturgeon Species ◽

Dark Color ◽

Determination Methods ◽

Morphological Differences ◽

Almost All

AbstractSturgeons are valued as specialty black caviar, which is very expensive. Only females are used in the technology of caviar aquaculture. Universal method of sex determination has not yet been developed. Most of known methods are not sufficiently accurate, or used at a relatively late age, or difficult to use. Perfect early determination of sex is considered to be impossible. Because of the dark color of most sturgeon, important morphological differences, which fish of almost all ages have, were overlooked. We first found that the scute structure of Sterlet and Siberian sturgeon depends on the sex, such a pattern is typical for sturgeon of all ages. We found that sex determination is possible at very early stages. Dependencies found with the help of machine learning method open a possibility for creation of sex determination equipment using the artificial intelligence. Our results open a perspective for creation of the sex determination methods for other 23 sturgeon species, which can increase the efficiency of caviar aquaculture and sturgeon restoration in natural waters.

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CYTOTAXONOMY AND SEX DETERMINATION OF RUMEX PAUCIFOLIUS

Canadian Journal of Botany ◽

10.1139/b56-023 ◽

1956 ◽

Vol 34 (2) ◽

pp. 261-268 ◽

Cited By ~ 12

Author(s):

Áskell Löve ◽

Nina Sarkar

Keyword(s):

Sex Determination ◽

Y Chromosome ◽

Sex Chromosomes ◽

The Other ◽

Large Chromosome ◽

Dioecious Species ◽

The Third ◽

Male Sex ◽

Morphological Differences

The western North American dioecious species Rumex paucifolius is shown to be a tetraploid with 2n = 28 chromosomes. It is the third tetraploid known within the subgenus Acetosa, and the first polyploid dioecious taxon of that group, the others having either 2n = 14 ♂, 15 ♀ (R. Acetosa and relatives), or 2n = 8 ♂, 9 ♀ (R. hastatulus). The sex chromosomes of R. paucifolius are of the XX:XY type, the male sex being heterogametic. The X is a large chromosome, while the Y is the smallest chromosome of the complement. The mechanism of sex determination of R. paucifolius follows the Melandrium–Acetosella scheme with strongly epistatic male determinants in the Y–chromosome. Other dioecious Acetosae follow the Drosophila–Acetosa scheme of sex determination with a balance between the number of X and autosome complements, the Y being sexually inert. It is concluded from the observed cytogenetical and morphological differences that R. paucifolius should constitute a section of its own, Paucifoliae, which should be placed as far as possible from the section Acetosa, though within the same subgenus. The other American dioecious endemic, R. hastatulus, is placed in a subsection of the section Acetosa.

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Determination of Sex of the Douglas-fir Beetle Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae)

The Canadian Entomologist ◽

10.4039/ent961327-10 ◽

1964 ◽

Vol 96 (10) ◽

pp. 1327-1329 ◽

Cited By ~ 18

Author(s):

Orlo K. Jantz ◽

Richard L. Johnsey

Keyword(s):

Sex Determination ◽

Rapid Method ◽

Microscopic Observation ◽

Douglas Fir ◽

Dendroctonus Pseudotsugae ◽

Determination Methods

AbstractA comparison of four sex determination methods shows that microscopic observation of the elytral declivity is the most accurate and rapid method for sexing large quantities of Douglas-fir beetles.

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Gender determination of caucasoid hair using image analysis

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100146928 ◽

1993 ◽

Vol 51 ◽

pp. 216-217

Author(s):

T.B. Ball ◽

W.M. Hess

Keyword(s):

Image Analysis ◽

Cross Sections ◽

Scalp Hair ◽

The Body ◽

Equivalent Diameter ◽

Cross Sectional ◽

Hair Samples ◽

Length Width ◽

Morphological Differences

It has been demonstrated that cross sections of bundles of hair can be effectively studied using image analysis. These studies can help to elucidate morphological differences of hair from one region of the body to another. The purpose of the present investigation was to use image analysis to determine whether morphological differences could be demonstrated between male and female human Caucasian terminal scalp hair.Hair samples were taken from the back of the head from 18 caucasoid males and 13 caucasoid females (Figs. 1-2). Bundles of 50 hairs were processed for cross-sectional examination and then analyzed using Prism Image Analysis software on a Macintosh llci computer. Twenty morphological parameters of size and shape were evaluated for each hair cross-section. The size parameters evaluated were area, convex area, perimeter, convex perimeter, length, breadth, fiber length, width, equivalent diameter, and inscribed radius. The shape parameters considered were formfactor, roundness, convexity, solidity, compactness, aspect ratio, elongation, curl, and fractal dimension.

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SEX DETERMINATION OF FETUS PRENATAL FROM MATERNAL PLASMA BY USING DUPLEX PCR TECHNIQUE IN GOAT

Basrah Journal of veterinary Research ◽

10.33762/bvetr.2014.88125 ◽

2014 ◽

Vol 13 (1) ◽

pp. 50-59

Author(s):

A NisreenYasirJasim ◽

Tahir A. Fahid ◽

Talib Ahmed Jaayid

Keyword(s):

Sex Determination ◽

Maternal Plasma ◽

Duplex Pcr

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Study of Significance of Pelvic Brim Chord and Pelvic Brim Depth in Sex Determination of Human Hip Bone

International Journal of Scientific Research ◽

10.15373/22778179/jan2014/132 ◽

2012 ◽

Vol 3 (1) ◽

pp. 384-386

Author(s):

Dr. Sudarshan Gupta ◽

◽

Dr. Bhadresh Vaghela ◽

Dr. Deepak Howale ◽

Dr. Mehul Tandel

Keyword(s):

Sex Determination ◽

Pelvic Brim

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Population Change, Modernization and Welfare. By Joseph Spengler. Prentice-Hall Inc., Englewood Cliffs, N.J. 1974.

The Pakistan Development Review ◽

10.30541/v16i2pp.220-222 ◽

1977 ◽

Vol 16 (2) ◽

pp. 220-222

Author(s):

Zeba A. Sathar

Keyword(s):

Population Growth ◽

Population Change ◽

Population Control ◽

Stable Condition ◽

Developed Countries ◽

Wide Field ◽

Wide Scale ◽

Socio Economic Variables ◽

Almost All

The book covers a wide field, touching on almost all aspects of popula¬tion change on a world-wide scale. It discusses, using world and country data, the relationships between demographic and socio-economic variables, and elaborates on" their relative importance in the determination of population problems which confront the world as a whole and nations individually. Policies designed to alleviate these problems are discussed with an emphasis on those related to population control. The first chapter is entitled "Population Growth: Past and Prospective" and reviews the various parameters associated with population change in the past and in the future. It touches upon the concept of a stable population in order to show the elements which cause a population to change (i.e. remove it from its stable condition). The main elements of change, population growth, migration, mortality and natality are discussed individually. The chapter is concluded by a description of the main differences in these elements and other socio-economic conditions as they exist in the less-developed and developed countries.

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AVALIAÇÃO DO CONHECIMENTO TRADICIONAL DOS PESCADORES DA RDSM APLICADO À IDENTIFICAÇÃO DO SEXO DE PIRARUCUS

Scientific Magazine UAKARI ◽

10.31420/uakari.v5i2.67 ◽

2010 ◽

Vol 5 (2) ◽

pp. 59-66

Author(s):

Kelven Lopes ◽

Helder Lima de Queiroz

Keyword(s):

Sex Determination ◽

Traditional Knowledge ◽

Structured Interviews ◽

Sustainable Fisheries ◽

Arapaima Gigas ◽

Males And Females

This study examined the traditional knowledge of fishermen at Mamirauá Reserve about sex determination of pirarucus, Arapaima gigas Schinz 1822. We evaluated the criteria used for by fishermen in the sector Jarauá at Mamirauá Reserve for this determination, during the fisheries season, from October to November 2004. We analyzed responses of a group of about 15 fishermen collected in structured interviews regarding 109 individual pirarucus, 65 males and 44 females. From this sample, only 64 fish have their sex correctly predicted by the fishermen. Although the traditional knowledge of local fishermen is a key component of the sustainable fisheries of this species, this knowledge is not functional in all ranges and aspects, as in sex distinction. We found that the local fishermen evaluated are not able to recognize the sex of pirarucus, although some criteria applied for this purpose are consistent with their biology. The rates of correct forecasts for recognition of males and females were similar to those obtained by chance, even when the criteria applied were consistent, as the criterion “coloration”, which was significantly consistent for identification of males. Yet the group of fishermen interviewed in this study apparently did not apply this criterion correctly.

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