File:Anableps anableps (largescale four-eyed fish) 2 (15534232807).jpg
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Summary
DescriptionAnableps anableps (largescale four-eyed fish) 2 (15534232807).jpg |
Anableps anableps (Linnaeus, 1758) - largescale four-eyed fish from the Paria Peninsula of coastal Venezuela (captive, Newport Aquarium, Newport, Kentucky, USA). Four-eyed fish (Anableps anableps) are some of the more bizarre fish on Earth. This species inhabits freshwater to brackish water settings in coastal northeastern South America. It typically hangs out just below the air-water interface. While at the surface, its eyes protrude from the water. Four-eyed fish eyes have pear-shaped lenses & each eye is divided into two parts by a thin band of horizontal tissue (each eye has two corneas and two retinas). The dorsal portion of each eye can focus on & image objects in air (using the lower retina), while at the same time the ventral portion of each eye can focus on & image objects in the water (using the upper retina). Four-eyed fish are live-bearers - they do not lay eggs. External reproductive structures in male & female four-eyed fish are remarkable for being asymmetrically directed. So, “left-handed males” can only mate with “right-handed females” and vice-versa. Published observations indicate that dextral males, dextral females, sinistral males, and sinistral females are roughly evenly distributed in natural populations. Classification: Animalia, Chordata, Vertebrata, Osteichthyes, Actinopterygii, Cyprinodontiformes, Cyprinodontoidei, Anablepidae Most info. from Herald (1962) & Lagler et al. (1962) & the Newport Aquarium. |
Date | |
Source | Anableps anableps (largescale four-eyed fish) 2 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15534232807. It was reviewed on 4 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
4 May 2015
Items portrayed in this file
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25 March 2010
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25787a5cba2fa2e1d7bde71441246353a06d5ff1
680,916 byte
1,240 pixel
2,121 pixel
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:39, 3 May 2015 | 2,121 × 1,240 (665 KB) | Natuur12 | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/60 sec (0.016666666666667) |
F Number | f/5 |
Date and time of data generation | 10:55, 25 March 2010 |
Lens focal length | 65 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 15:03, 5 November 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 10:55, 25 March 2010 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.6 APEX (f/4.92) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 97 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Soft |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 0,100 |
Image width | 2,121 px |
Image height | 1,240 px |
Date metadata was last modified | 10:03, 5 November 2014 |