Classification of guppies’ (Poecilia reticulata) gender by computer vision     

B. Zion  V. Alchanatis  V. Ostrovsky  A. Barki  I. Karplus 《Aquacultural Engineering》2008,38(2):97-104

Labor costs of guppy growers and breeders are largely those of manual sorting (by strain, quality and gender) and counting fish. In most farms, female and male fish are grown together and sold either separately or together. Sorting fish according to gender is important for marketing as well as for breeding programs, so that a device for sorting and counting fish can potentially reduce production costs and improve quality.

A project aiming to develop sorting and counting technologies for ornamental fish growers included development and testing of image-processing algorithms for sorting guppy fish (Poecilia reticulata) by gender. The algorithms are derived from shape and color differences between female and male guppies. An algorithm for the determination of landmarks on fish contours was developed and found to be accurate in accordance with human judgment, enabling extraction of specific shape and color features of the tail and the body.

The algorithms were applied to three sets of images of guppies of the “Red-Blond” strain. Gender identification accuracy was approximately 90% using shape features, approximately 96% using color features and was slightly improved when both color and shape features were used.

Some of the components used are essential for future development of a computer vision based system for sorting and grading ornamental fish by strain and quality.  相似文献   

A study of replication of foot-and-mouth disease virus in infected cells     

M A Shestochenko  V P Karev  I A Rostovtseva  G T Chernyshova 《Veterinariia》1968,45(7):22-23

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Characterizing Submergence Survival Strategy in Rice Via Chlorophyll Fluorescence     

C. Sone  O. Ito  J.‐I. Sakagami 《Journal of Agronomy and Crop Science》2012,198(2):152-160

Rice plants cope with flash floods using either an ‘escape strategy’ involving rapid shoot elongation or a ‘quiescence strategy’ involving survival underwater with minimal activity. To clarify the differences in the response of leaf photosynthesis properties to conditions during and after submergence, two rice cultivars were compared: a non‐shoot‐elongating cultivar IR 67520‐B‐14‐1‐3‐2‐2 (IR67520) and a shoot‐elongating cultivar IR72442‐6B‐3‐2‐1‐1 (IR72442). Twenty‐three‐day‐old seedlings were submerged in 80‐cm‐deep water for 14 days. During submergence, the chlorophyll contents of the upper fully expanded leaf (5th leaf) and newly developed leaf later (6th leaf) and the maximal quantum yield of photosystem II (F_v/F_m) of the fifth leaf decreased earlier in IR72442 than in IR67520. In the submerged sixth leaf, F_v/F_m was higher in IR72442 than in IR67520 at early measurement. Although F_v/F_m of the sixth leaf in submerged IR67520 increased substantially from 2 days post‐submergence, IR72442 decreased because of leaf chlorosis. Therefore, a non‐shoot‐elongating cultivar coped with submergence by inhibiting photodamage and maintaining high chlorophyll content in the leaves. The shoot‐elongating cultivar was able to maintain the photosynthetic capacity of the newly developed leaf during submergence by prompt reduction of chlorophyll and chlorophyll fluorescence in the leaf that developed before submergence.  相似文献   

We are training worthy replacements     

A M Alekseev  V I Zavrazhin 《Veterinariia》1969,46(11):46-48

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Electrical afterbirth extractor for cows]     

M P Riazanski?  Iu A Lochkarev  I A Dolzhenko 《Veterinariia》1978,(5):73-76

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Grisin and kormogrisin toxicity     

V I Aksenov 《Veterinariia》1974,(12):93-94

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DEATH OF THE OLDEST CHIMPANZEE IN CAPTIVITY     

Tomilin MI 《Science (New York, N.Y.)》1936,83(2144):103-104

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Visceral larva migrans of Neoascaris vitulorum in laboratory animals     

O A Atallah  I Mossalam  M S Abdel-Ruhman 《Acta veterinaria Academiae Scientiarum Hungaricae》1974,24(3):207-220

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Tolerance of four spring barley (Hordeum vulgare) varieties to weed harrowing     

P K HANSEN  I A RASMUSSEN  N HOLST  & C ANDREASEN† 《Weed Research》2007,47(3):241-251

We investigated the tolerance to weed harrowing of four spring barley varieties and examined the possible interactions between varietal weed suppressive ability and two nutrient levels. Tolerance was defined as the combined effect of crop resistance (ability to resist soil covering) and crop recovery (the ability to recover in terms of yield). The weed harrowing strategy was a combination of one pre‐ and one post‐emergence weed harrowing. In terms of yield, the four varieties responded significantly differently to weed harrowing and the response depended on nutrient level. At the lower nutrient level, weed harrowing caused an increase in yield of 4.4 hkg ha⁻¹ for a strong competitor (cv. Otira), while there was no effect on yield at the higher nutrient level. For a weaker competitor (cv. Brazil), weed harrowing caused no change in yield at the lower nutrient level, whereas yield decreased by 6.0 hkg ha⁻¹ at the higher nutrient level. There were marked differences between the weed suppressive ability of the four varieties when not harrowed, with less pronounced but significant differences when harrowed. Weed harrowing did not change the weed suppressive ability of a variety. Varieties that are tall at post‐emergence harrowing and have increased density after pre‐emergence harrowing, are the ones that benefit most from weed harrowing.  相似文献   

Clinical staging of feline immunodeficiency virus infection   总被引：9，自引：0，他引：9  

T Ishida  I Tomoda 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1990,52(3):645-648

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