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Like other fish, sharks extract oxygen from seawater as it passes over their gills. Unlike other fish, shark gill slits are not covered, but lie in a row behind the head. A modified slit called a spiracle lies just behind the eye, which assists the shark with taking in water during respiration and plays a major role in bottom–dwelling sharks.
A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians.
Chimaeras differ from other cartilagenous fish, having lost both the spiracle and the fifth gill slit. The remaining slits are covered by an operculum, developed from the septum of the gill arch in front of the first gill. [6] The shared trait of breathing via gills in bony fish and cartilaginous fish is a famous example of symplesiomorphy.
Corpora lutea are found only in mammals, and in some elasmobranch fish; in other species, the remnants of the follicle are quickly resorbed by the ovary. [2] The ovary of teleosts is often contains a hollow, lymph-filled space which opens into the oviduct, and into which the eggs are shed. [2] Most normal female fish have two ovaries.
About 375 fish species are known from the Mississippi basin, far exceeding other North Hemisphere river basins exclusively within temperate/subtropical regions, [123] except the Yangtze. [124] Within the Mississippi basin, streams that have their source in the Appalachian and Ozark highlands contain especially many species.
The Aquarium Unter den Linden was a three-story building. Machinery and water tanks were on the ground floor, and aquarium basins for the fish on the first floor. Because of Brehm's special interest in birds, a huge aviary, with cages for mammals placed around it, was located on the second floor. The facility closed in 1910. [4]
Bubba (c. 1982 – August 22, 2006) was a giant grouper (Queensland grouper) that resided at the Shedd Aquarium in Chicago, Illinois. Bubba is believed to be the first fish to undergo chemotherapy. He was often nicknamed "The Super Grouper".
The Headington Shark (proper name Untitled 1986) is a rooftop sculpture located at 2 New High Street, Headington, Oxford, England, depicting a large shark embedded head-first in the roof of a house.