Old Folks Home Essay

Sharks ar a separate of slant characterized by a cartilaginous skeleton, five to seven lamella slits on the sides of the head, andpect spoken fins that atomic number 18 not amalgamated to the head. young chisels be classified within the clade Selachimorpha (or Selachii) and argon the sister concourse to the rays. However, the term shark has likewise been apply for extinct ing blood-redients of the subclassElasmobranchii extracurricular the Selachimorpha, such as Cladoselache and Xena ceasethus. Under this broader definition, the earliest known sharks date from more(prenominal) than 420 whizz and only(a) jillion million years ago.Since thusly, sharks name diversified into oer 470 species. They look-alike in size from the clarified dwarf lanternshark(Etmopterus perryi), a deep sea species of further 17 centimetres (6.7 in) in continuance, to the giant star shark (Rhincodon typus), the abundantst search in the cosmea, which progress toes rough 12 metre s (39 ft). Sharks argon gear up in in all seas and argon common to depths of 2,000 metres (6,600 ft). They broadly speaking do not perish in refreshing peeing although there ar a few known exceptions, such as the bull shark and the river shark, which lot run short in both seawater and freshwater. They go on finished five to seven gill slits. Sharks throw a covering of dermic denticles that protects their skin from damage and parasites in improver to improving their fluid dynamics. They pee round(prenominal) sets of replaceable odontiasis. Well-known species such as the gr corrode white shark, tiger shark, unsanctified shark, mako shark, and the hammerhead shark beapex predatorsorganisms at the top of their underwater food kitchen stoveTetraodontidae is a family of primarily naval and estuarine lean of the order Tetraodontiformes. The family includes numerous an(prenominal) familiar species, which atomic number 18 variously called pufferfish, puffers, balloon fish, blowfish, bubblefish, globefish, swellfish,toadfish, toadies, dulcorate toads, sugar toads, and sea squab.1 They ar morphologically similar to the closely relatedporcupinefish, which have large external spines (un like the thinner, hidden spines of Tetraodontidae, which ar only visible when the fish has puffed up). The scientific name refers to the four large teeth, fused into an upper and lower plate, which atomic number 18 used for crushing the shells of crustaceans and mollusks, their immanent prey.Pufferfish argon broadly speaking believed to be the second- closelypoisonous vertebrates in the world, aft(prenominal)wards the golden poison frog. Certain native organs, such as stick upr, and sometimes the skin, behave tetrodotoxin and atomic number 18 highly toxic to most living creatures when eaten nevertheless, the meat of some species is considered a statecraft in Japan (as , pronounced as fugu), Korea (as bok or bogeo ), and China (as htn) when prepared by specifically ingenious chefs who know which part is safe to eat and in what quantity. The Tetraodontidae contain at least 120 species of puffers in 19 genera.1 They are most diverse in the tropics, relatively uncommon in the temperate zone, and completely absent from cold waters. They are typically small to medium in size, although a few species locoweed reach lengths of spectacularer than 100 cm (39 in).The heaven fish, paradisefish, or paradise gourami, Macropodus opercularis, is a species of gourami found in most types of fresh water in East Asia, ranging from the Korean Peninsula to Federal Vietnam. This species can reach a length of 6.7 cm (2.6 in), though most are only most 5.5 cm (2.2 in). nirvana gouramis were one of the first ornamental fish functional to western aquarium keepers, having been import toEurope as early as the nineteenth century. The paradise fish is one of the more aggressive members of its family. It is more aggressive than the trey spot gourami, yet less tough in nature than the less usually kept combtail.Paradise fish are fairly combative, harassing and attacking each other, as well as potentially sidesplitting small fish. In the wild, they are predators, ingest insects,invertebrates, and fish fry. The popularity of this species has waned in recent decades as very much(prenominal) more colorful (and a good deal less pugnacious) species of gouramishave wrick widely available to hobbyists. This species is one of the few fish that can change its color (lighter or darker) in response to stimuli.Eels are elongated fish, ranging in length from 5 cm (2.0 in) in the one-jawed eel (Monognathusahlstromi)dubious discuss to 4 m (13 ft) in the sparse giant moray.2 Adults range in fish from 30 grams (1.1 oz) to well over 25 kilograms (55 lb). They possess no pelvic fins, and umpteen species also lack pectoral fins. The dorsal and anal fins are fused withthe taillike or tail fin, forming a whizz ribbon running along much of the length of the animal. or so eels live in the shallow waters of the ocean and turn over into sand, mud, or amongst rocks. A majority of eel species are nocturnal, and thus are rarely seen. sometimes they are seen living unneurotic in holes, or eel pits. more or less species of eels also live in deeper water on the Continental shelves and over the slopes deep as 4,000 m (13,000 ft). Only members of the Anguilla family regularly be fresh water, but they too getting even to the sea to breed. Eels begin life as flat and transparent larvae, or leptocephali.Eel larvae tramp in the sur guinea pig waters of the sea, feeding on naval snow, small particles that float in the water. Eel larvae then metamorphose into glass eels and then becomeelvers forward finally seeking out their youthful and adult habitats. Freshwater elvers travel upstream and are forced to climb up obstructions, such as weirs, dam walls, and natural waterfalls. Lady Colin Campbell found, at Ballisodare, the e el fisheries were greatly ameliorate by the hanging of loosely plaited toilet ladders over barriers, enabling the elvers to ascend. The heaviest true eel is the European conger. The maximum size of this species has been reported as reaching a length of 3 m (10 ft) and a turn overt of one hundred ten kg (240 lb). Other eels are endless but do not weigh as much, such as the lithe giant moray which reaches 4 m (13 ft).The guppy (Poecilia reticulata), also known as million fish and rainbow fish,1 is one of the worlds most widely distributed tropic fish, and one of the most popularfreshwater aquarium fish species. It is a member of the Poeciliidae family and, like all other members of the family, is live-bearing.2 Guppies, whose natural range is in northeast South America, were introduced to many habitats and are now found all over the world. They are highly pliant and thrive in many antithetic environmental and ecological conditions.3 Male guppies, which are small than females, have ornamental caudal and dorsal fins, temporary hookup females are duller in colour. Wild guppies generally feed on a variety of food cum including benthic algae and aquatic insectlarvae.4 Guppies are used as a pose organism in the field of ecology, evolution, and behavioral studies.3They are the most ferocious fish in the world. Even the most impressive fish, the sharks or the barracudas, usually attack things smaller than themselves. But the vultures habitually attack things much larger than themselves. They will snap a finger morose a muckle incautiously trailed in the water they off swimmersin every river town in Paraguay there are men who have been thus mutilated they will smash and devour alive any hurt man or beast for crosscurrent in the water excites them to madness. They will inject wounded wild fowl to meets and cock up off the tails of fine-looking fish as they grow exhausted when chip after being hooked. But the piranha is a short, deep-bodied fish, with a blunt face and a heavily undershot or projecting lower jaw which gapes widely. The razor-edged teeth are wedge- functiond like a sharks, and the jaw muscles possess great power.The rabid, furious snaps drive the teeth through flesh and bone. The head with its short muzzle, gaze malignant eyes, and gaping, cruelly armed jaws, is the frame of evil ferocity and the actions of the fish on the button match its looks. I never witnessed an collection of such impotent, savage fury as was shown by the piranhas as they flapped on deck. When fresh from the water and thrown on the boards they verbalise an extraordinary squealing sound. As they flapped adeptly they bit with vicious eagerness at whatever presented itself. One of them flapped into a fabric and seized it with a bulldog grip.Another grasped one of its fellows another snapped at a piece of wood, and left the teeth-marks deep therein. They are the pests of the waters, and it is essential to be exceedingly cautious abou t either swimming or wade where they are found. If cattle are compulsive into, or of their own accord enter, the water, they are commonly not molested but if by chance some unusually big or ferocious specimen of these dreaded fishes does bite an animaltaking off part of an ear, or perhaps of a teat from the udder of a appalthe blood brings up every member of the ravenous throng which is anywhere near, and unless the attacked animal can immediately make its scarper from the water it is devoured alive.28A tunny fish is a saltwater finfish that belongs to the tribe Thunnini, a sub-grouping of the mackerel family (Scombridae) which together with the tunas, also includes the bonitos, mackerels, and Spanish mackerels. Thunnini comprises fifteen species crosswise five genera,1 the sizes of which varygreatly, ranging from the bullet tuna (max. length 50 cm (1.6 ft), cant over 1.8 kg (4 lb)) up to theAtlantic bluefin tuna (max. length 4.6 m (15 ft), weight 684 kg (1,508 lb)). The blu efin averages 2 m (6.6 ft), and is believed to live for up to 50 years. Their circulatory and respiratory systems are unique among fish, enabling them to proceed a body temperature higher than the meet water. An active and agile predator, the tuna has a sleek, streamlined body, and is among the fastest-swimming pelagic fish the yellowfin tuna, for example, is capable of speeds of up to 75 km/h (47 mph).2 Found in expectant seas, it is extensively fished commercially and is popular as a game fish. As a result of over-fishing, stocks of some tuna species, such as the Southern bluefin tuna, have been reduced dangerously close to the signalise of extinction.3The hammerhead sharks are a group of sharks in the family Sphyrnidae, so named for the unusual and characteristic structure of their heads, which are flattened and laterally extended into a hammer shape called a cephalofoil. Most hammerhead species are placed in the genus Sphyrna while the winghead sharkis placed in its own g enus, Eusphyra. many not necessarily mutually sole(prenominal) functions have been proposed for the cephalofoil, including sensory reception, maneuvering, and prey manipulation. Hammerheads are found worldwide in tepid waters along coastlines and continental shelves. unconnected most sharks, hammerheads usually swim in schools during the day, becoming solitary hunters at night. Some of these schools can be found near Malpelo Island in Colombia, Cocos Island off costa Rica, and near Molokai Island in Hawaii. Large schools are also seen in southern and east Africa.Starfish or sea stars are star-shaped echinoderms belonging to the classAsteroidea. Common system frequently finds these names being also applied toophiuroids, which are correctly referred to as brittle stars or basket stars. more or less 1,500 species of sea star occur on the ocean bottom in all the worlds oceans, from the tropics to frigid polar waters. They are found from the intertidal zonedown to abyssal depths , 6,000 m (20,000 ft) below the surface. Starfish are marine invertebrates. They typically have a underlying disc and five arms, though some species have more than this. Theaboral or upper surface may be smooth, granular or spiny, and is covered with lapping plates. Many species are brightly biased in various shades of red or orange, while others are blue, canescent or brown. Starfish have furnish feet operated by a hydraulic systemand a mouth at the centre of the oral or lower surface. They are opportunisticfeeders and are mostly predators on benthic invertebrates.several(prenominal)(prenominal) species have specialized feeding behaviours including upending of their stomachs andsuspension feeding. They have complex life cycles and can reproduce both sexually and asexually. Most can regenerate damaged split or lost arms and they can shed arms as a means of defence. The Asteroidea occupy several significant ecological roles. Starfish, such as the ochre sea star (Pisaster ochra ceus) and the lower sea star (Stichaster australis), have become widely known as examples of the anchorperson species concept in ecology. The tropicalcrown-of-thorns starfish (Acanthaster planci) is a voracious predator of coralthroughout the Indo- peaceful region, and the northern Pacific sea star is considered to be one of the worlds 100 finish up invasive species.The fossil record for starfish is ancient, dating back to the Ordovician around 450 million years ago, but it is rather poor, as starfish tend to disintegrate after death. Only the ossicles and spines of the animal are possible to be preserved, making remains hard to locate. With their appealing symmetrical shape, starfish have played a part in literature, legend, design and popular culture. They are sometimes collected as curios, used in design or as logos, and in some cultures, despite possible toxicity, they are eaten.