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Topic: Dorsal fin

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	Dorsal fin - Wikipedia, the free encyclopedia
		There may be two dorsal fins, a long fin merged with the caudal fin (tail), or no dorsal fin at all, as with the knifefish.
		In relation to the size of the creature, the dorsal fin of the male orca is quite large, as much as 1.8 m high.
		The dorsal fins of whales develop distinctive nicks and wear patterns with time, and this fact is used by wildlife biologists to identify individuals in the field.
	en.wikipedia.org /wiki/Dorsal_fin (252 words)

	[No title]
		Dorsal greatly enlarged in adults (especially males), reaching adipose fin when depressed, but is shorter in females; pelvics rather long, reach anal fin in adult males, but not in females; lower lobe of caudal often longer than upper.
		Dorsal fin convex, nearer snout than base of caudal fin, and behind pelvic fins; dorsal fin with 2-3 short spines, 10-11 rays; anal fin 2-3 spines, 6-7 rays; pelvic fins 1 spine, 6 rays.
		Dorsal spines separated from each other and from the soft-rayed fins, each spine having a reduced membrane attached to its posterior side; anal spine free from rest of the fin; posterior margin of pectorals nearly truncate; caudal truncate to slightly indented.
	www.ksu.edu /fishecology/Ichthyology/Lab8.htm (1443 words)

	CRESLI fin whale page
		Fin whales (also know as finback whales) can reach lengths of over 80 feet and weights of more than 160,000 lbs in the northern hemisphere and over 85 feet and 170,000 lbs in the southern hemisphere and are distributed around the world except for the tropics, i.e., they have an antitropical distribution.
		Fin whales feed on a wide array of prey species, depending upon availability, ranging from small schooling fish such as sand eels, herring and tinker mackerel, to crustaceans such as krill and copepods, to squid.
		Although fin whales are relatively common and are believed to be the dominant cetacean species during all seasons in the US Exclusive Economic Zone, scientists don't have enough data to determine the fin whale's population trends.
	www.cresli.org /cresli/cetacean/finwhale.html (1005 words)

	* Adipose - (Aquarium): Definition (Site not responding. Last check: 2007-10-22)
		All of the fins are pointed, there is an adipose fin, the scales are large for a characin, and the mouth and dentention are extremely well developed...
		The ventral and adipose fins are blood-red on the females and fl on the males...
		The pectoral, dorsal and adipose fins are dark at the base and become pale or white at the edge.
	www.bestknows.com /aquarium/adipose.html (808 words)

	AllRefer.com - fin (Zoology: General) - Encyclopedia
		In the majority of fishes, however, there are one, two, or three dorsal fins, a distinct tail fin, and an anal fin.
		These are the pectoral fins, placed just back of the gills, and the pelvic, or ventral, fins, variable in position and sometimes lacking entirely.
		An adipose fin (fatty tissue without support) is found behind the dorsal fin in some fish, e.g., the salmon and the catfish.
	reference.allrefer.com /encyclopedia/F/fin.html (244 words)

	New Zuiyo Maru Cryptid Observations - Strong Indications It Was a Marine Tetrapod
		65), this upper fin is to be interpreted as a shark’s dorsal fin that slid sideways.
		This fin (B) is the same fin that other scientists thought was the dorsal fin of a shark that had slid sideways from the center.
		The fin on the upper right anterior portion of the cryptid has always been recognized, although it is usually regarded as a displaced dorsal fin of a shark.
	www.creationresearch.org /cgi-bin/MasterPFP.cgi?doc=http://www.creationresearch.org/crsq/articles/38/38_1/Cryptid.htm (6412 words)

	The Arctic Grayling - A Grail Of Sorts (Site not responding. Last check: 2007-10-22)
		But most noteworthy was the grayling’s large sail-like dorsal fin, shaded with iridescent blue or pink spots and a stripe along the top margin of the fin of a similar color.
		Grayling flare their dorsal fins when they are aggressively challenging or defending feeding positions or territories from grayling or other competing species.
		The flared dorsal fin is, in effect, the grayling “flexing their muscles” to give the appearance of a bigger, stronger, more formidable foe.
	www.outdoorcentral.com /mc/pr/03/05/09e7.asp (519 words)

	A Guide to the Tunas of the Western Atlantic (Site not responding. Last check: 2007-10-22)
		The 2nd dorsal and anal fins are yellow, and the finlets are yellow with a narrow fl margin.
		The pectoral and ventral fins are short, and the two dorsal fins are separated at the base by a small interspace.
		The pectoral and ventral fins are short and broad, and the two dorsal fins are separated at the base by a small interspace.
	www.noreast.com /tuna/tunapage2.cfm (1610 words)

	To save dolphin's dorsal fin experts combine medical technology and teamwork
		Liko sustained a tear at the base of his dorsal (top) fin, likely in a game of "chase" with his dolphin cohorts.
		A dolphin's dorsal fin consists of soft, cartilage-like tissue.
		Liko's dorsal fin continues its remarkable healing as the young dolphin continues to participate in his pioneering regenerative therapies in a quiet lagoon alongside the Hilton Waikoloa Village Resort.
	www.eurekalert.org /pub_releases/2004-10/uopm-tsd101904.php (877 words)

	THE DORSAL FIN (Site not responding. Last check: 2007-10-22)
		The Dorsal Fin bait and tackle store is well known to Adelaide's fishing club anglers as well as regular northern suburbs anglers who respect quality bait and tackle as well as friendly service from a team of "experts".
		The Dorsal Fin's bait and berley supply is well described as extensive, including many varied oil's and berley mixtures and a fine pre made, non sticky "secret" recipe that works well.
		On top of all that the Dorsal Fin is also the northern suburbs agent for Australian Boat Hire so if you are looking for a cheap day on the briny, drop in and see Mike about hiring a boat.
	www.geocities.com /HotSprings/3989/Dorsal.html (346 words)

	Fish Review
		Pelvic fins thoracic, dorsal and anal fin with spines.
		The dorsal fin consists of two well-separated parts, the first of which (the spinous dorsal) is often small and not always obvious.
		It is distinguished from the similiar Atlantic silverside by having a shorter anal fin (16 -19 rays) with a curved border, the anterior rays being longer than the posterior ones..
	ww2.coastal.edu /richard/Ichthyology/fishreview.htm (1849 words)

	Vertebrates Page 4 - Keys to the Aquatic Biota of the Hawaiian Islands
		Dorsal fin usually much shorter, but always with 10 or fewer spines (Note: the full dorsal fin may have few spines but many soft rays which are flexible, segmented, and branching)
		Dorsal fin with 4 to 10 stiff spines.
		Dorsal fins well separated, the first with 6 spines, the second with 10 rays.
	www.aecos.com /CPIE/ver_04.html (578 words)

	Boston.com / News / Local / Maine / Researcher IDs brook trout by dorsal fin markings (Site not responding. Last check: 2007-10-22)
		Overlock, a senior research student from Winslow, claims to have made the discovery that brook trout have individualized dorsal fins -- what he calls "fin prints" -- that enable observers to differentiate one fish from another.
		He suddenly noticed that he could tell the fish apart by the patterns in their dorsal fins.
		After Overlock brought his findings to Chacko, the pair developed a technique to individually photograph the fish and then transfer the patterns on the dorsal fin into fl-and-white images.
	www.boston.com /news/local/maine/articles/2005/05/02/researcher_ids_brook_trout_by_dorsal_fin_markings (401 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		Males with forntal tenaculum upturned distally with spines along dorsal upturned edge, prepelvic tenacula with lateral fold of tissue, bearing spines along medial edge and on lateral surface, and pelvic claspers with pale fleshy distal lobes, divided distally for 1/3 their length, tips usually extending beyond distal edge of pelvic fins.
		Dorsal surface of the tenaculum upturned distally with denticles extending onto the dorsal surface along the upturned edge.
		Hydrolagus trolli also differs from H. pallidus in having pelvic clapsers that reach beyond the distal margin of the pelvic fins, a frontal tenaculum that is upturned and its distal edge not flat, first dorsal fin with pale margin rather than the darker margin observed in some specimens of H. pallidus.
	www.acnatsci.org /press/special/DidierandSeretfinal.doc (2525 words)

	Scubas World/Pelagics
		The second dorsal fin is almost an inverted mirror image in size and shape to the anal fin.
		The tail and anal fin may be yellowish, and the ends of the dorsal and upper tail are occasionally fl.
		The soft dorsal and anal fins are almost identical in size, and there are 18 to 21 soft rays in the dorsal fin and 16 to 19 gill rakers on the lower limb of the first arch.
	www.scubasworld.com /pelagics.html (2059 words)

	Locomotor function of the dorsal fin in teleost fishes: experimental analysis of wake forces in sunfish -- Drucker and ...
		Locomotor function of the dorsal fin in teleost fishes: experimental analysis of wake forces in sunfish -- Drucker and Lauder 204 (17): 2943 -- Journal of Experimental Biology
		fin’s vortices is proposed as a mechanism for augmenting
		Hydrodynamics of caudal fin locomotion by chub mackerel, Scomber japonicus (Scombridae)
	jeb.biologists.org /cgi/content/short/204/17/2943 (826 words)

	LIMNOLOGY
		In the case of fishes without fins, they are separated according to the total number of barbels.
		The movements of the fins are due to the action of muscles, the movements possible due to the articulations and often flexibility of these rays.
		Origin of fin: The point where the first ray is inserted into the body of the fish.
	ces.iisc.ernet.in /energy/monograph1/Methpage2.html (942 words)

	Precision of aging river carpsuckers using scales and dorsal fin rays (Site not responding. Last check: 2007-10-22)
		In this study, we compared the precision of age determinations between readers and mean back-calculated lengths at age of river carpsuckers using scales and dorsal fin ray sections from 172 individuals collected in the Missouri River.
		Age agreement between readers was 71% for both scales and dorsal fin ray sections.
		We suggest using scales to age and back-calculate lengths for river carpsuckers; however, fin rays can be used to corroborate ages derived from scales.
	www.ksu.edu /kscfwru/annual/precisio.of (228 words)

	Lutjanus peru dorsal fin references (Site not responding. Last check: 2007-10-22)
		The dorsal fin is single and continuous, and the first half is spinous.
		The posterior profile of the fin is rounded, and there are 10 spines and 13 or 14 soft rays.
		The anterior portion of the soft dorsal fin is not significantly taller than posterior part, and neither the anterior nor posterior fin rays are elongated.
	vm.cfsan.fda.gov /~frf/cfsan.fda.gov/~frf/rfe3ps12.html (257 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		Lateral line is straight at midbody with a dorsal branch extending half the length of the dorsal fin.
		Dorsal fin extends onto blind side terminating in line with the mouth.
		Lateral line is straight with a dorsal branch extending two-thirds the dorsal fin length.
	www.humboldt.edu /~raf1/fishbook/bony/b37.html (443 words)

	The Dorsal Fin (Site not responding. Last check: 2007-10-22)
		The dorsal fin, acts primarily as a stabilizer or rudder for directional control.
		However, some dorsals have evolved for protective reasons in to spines or venomous rays.
		Many catfish can lock the leading ray of the dorsal to prevent predation or to "wedge" themselves between rocks in fast flowing rivers.
	www.thatfishshop.com /ichthyology/dorsal_fin.htm (50 words)

	Gadus morhua dorsal fin references (Site not responding. Last check: 2007-10-22)
		Dorsal fin divided into 3 well-separated parts (forming separte fins), bearing about 14, 21 and 19 rays respectively.
		First dorsal fin originating posterior to head (predorsal distance less than about one-third of total length), its height about one-half of head length; third dorsal originating far posterior to the level of the vent.
		No fin spines..." References to family Gadidae: Page 97 (text) - "Our cods have 3 dorsal fins...some in other areas have 1 or 2 dorsal fins..." "No spinous fin rays" Robins and Ray 1986: Reference to family Gadidae: Page 92 (text) - "No fin spines.
	vm.cfsan.fda.gov /~frf/rfe3ac12.html (157 words)

	The relationship between heat flow and vasculature in the dorsal fin of wild bottlenose dolphins Tursiops truncatus -- ...
		the dorsal fin, pectoral flippers and flukes (Scholander and
		dorsal fin is a spatially heterogeneous thermal surface.
		dorsal fin submerged, it was apparent that as the temperature differential
	jeb.biologists.org /cgi/content/full/205/22/3475 (6189 words)

	Scholastic Canada: All About Dolphins
		When a dolphin is born, its dorsal fin is smooth and doesn't have any nicks or scratches.
		Each photograph of a distinctive dorsal fin that we take will be given an ID number and cataloged according to the location and size of the nicks.
		For example, the first distinct dolphin dorsal fin that we identify this year will be given the ID number "97-1".
	www.scholastic.ca /teacher/lessonrepro/lessonplans/dolphin/week5.htm (747 words)

	Locomotor function of the dorsal fin in teleost fishes: experimental analysis of wake forces in sunfish -- Drucker and ...
		Locomotor function of the dorsal fin in teleost fishes: experimental analysis of wake forces in sunfish -- Drucker and Lauder 204 (17): 2943 Figure IG2 -- Journal of Experimental Biology
		(B) Representative lateral-view reference image showing the dorsal lobe of the tail and the trailing edge of the soft dorsal fin intercepted by a horizontal (frontal-plane) laser sheet seen on edge as a white stripe.
		Fin movements and the resulting fluid flow within these planes are illustrated in Figs3–8 and Fig.10.
	jeb.biologists.org /cgi/content/full/204/17/2943/FIG2 (192 words)

	Present by Misinterpretation, and Rarely Present by Misinterpretation
		Angler fish have two dorsal fins, but the first is modified into a fleshy lure that does not look like a normal fin.
		In the case of angler fish, the state two dorsal fins would be scored Present, and the state one dorsal fin would be scored Present by misinterpretation.
		For example, a species of fish may normally clearly have two dorsal fins, but in occasional specimens one dorsal fin may be reduced to a small spine that could be overlooked.
	www.lucidcentral.com /lucid3/builderhelp/present_by_misinterpretation.htm (600 words)

	Fifth Annual Atlantic Coastal Dolphin Conference (Site not responding. Last check: 2007-10-22)
		In the Beaufort study area, there are some distinct dorsal fins that have been known to change over time and still be recognized as the same.
		In one case the dorsal fin changed so drastically that without the freezebrand, applied during a live capture, this fin would not have been verified as the same individual.
		This shows that there may be some dorsal fins that change over time and using photo-identification there is no way to classify them as the same.
	members.aol.com /adrcnet/1997/1997po01.html (232 words)

	Fin Whale (Balaenoptera physalus) (Site not responding. Last check: 2007-10-22)
		Fin whales feed mainly on krill but also eat schooling fish including herring, cod, mackerel, pollock, sardine, and capelin.
		The reproductive habits of these whales remain largely unknown; however, females are thought to give birth only at 3-year intervals.
		The gestation period is approximately 11 months and newborn fin whales are about 6.4 m in length and weigh 1.8 metric tons.
	www.nsrl.ttu.edu /tmot1/balaphys.htm (210 words)

	Third Annual Atlantic Coastal Dolphin Conference (Site not responding. Last check: 2007-10-22)
		A test was conducted to determine whether researchers in different areas would categorize dolphin dorsal fin images similarly when using the same cataloging system.
		These results tend to support the idea of having a central dorsal fin catalog where all images are categorized by one group instead of using a standard system for many research groups.
		A central fin catalog may be the best way to match identifiable dolphins from one study area to another.
	members.aol.com /adrcnet/1995/1995po01.html (200 words)

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