Anal fin
the un-paired fin on the underside of fish, behind the vent.
Anadromous
ascending rivers from the sea for breeding (not resident).
Anal fin Single fin mounted vertically below the fish.
Anaerobic A term used to describe an organism that lives in an environment with little or no oxygen.
Apical bud The principal growing point of the stem.
Anal Fin: The fin which lies beneath the body, just in front of the caudal fin.
Aerobic: Living with oxygen.
Aragonite: This composes the calcium carbonate skeletons of reef coral and some shells.
Anal Fin - Fin just behind anal opening.
Annual - See Killifish.
Anoxic - Low oxygen.
anal fin - Single fin mounted vertically below the fish.
barbels - Barbels are the whisker-like appendages found on both sides of the mouth of all catfish.
Anal: Pertaining to the hind or most posterior part of the body.
Anion Exchange: The chemical process where negative ions of one chemical are preferentially replaced by negative ions of another chemical.
[edit] Anal Fin
One fin on the ventral surface of the fish. This is usually always positioned after the vent at the rear of the fish just before the Caudal fin.
anal fin of the male describes a convex curve and the fin rays form a tube (which is the genital organ) - the trailing edge of the female anal fin is straight ...
Anal Fin - A single vertical fin which is located on the under side of the fish.
Aragonite - A mineral containing Calcium found in rock, gravel or sand.
Artemia - Is another term that brine shrimp are known as.
Anal fin. Also lends stability in swimming.
Pectoral fins. Locomotion and side to side movement.
Adipose fin. Stability.
· Anal = the region of the anus (as anal fin)
· Androgens = Male (genetic) hormones.
· Anisogamy = The difference in the size of the gametes, the small being the sperm (male) and the large being the egg (female) ...
The anal fin of the male is larger in mature specimens.
Breeding
The male wraps his body around the females genital area, so that the anal and caudal fins form a cup to receive eggs. The adhesive eggs are then scattered onto plants and other surfaces.
The single anal fin is located on the underside of the body just forward of the caudal fin. The anal fin serves to stabilize the fish while it is swimming. Long anal fins that are moved in an undulating manner are used for propulsion.
The male's anal fin is modified into a gonopodium by which he transfers sperm into the female.
The pointed anal fin and much larger dorsal fin on the male, and the rounded anal fin and pregnancy spot on the female differentiate the two.
Fewer total anal rays than B. balunga (28-29 vs. 30). More lateral scales than B. balunga and B. chini (31 1/2-32 1/2 vs. 29-31). More lateral scales below dorsal-fin origin (18-19, vs. 15-18). Greater total length than B. balunga and B. chini (145.
The dorsal, anal, caudal and pelvic fins are all tinted red, the caudal fin being forked, with the red colour concentrated in the outermost rays, the inner section of the tail fin being more hyaline.
Their dorsal and anal fins continue all the way back to it's yellow tail and they're trimmed in a black edging. They have thin bodies and are generally oval shaped.
The Spots on its Anal fin, known as egg spots, more spots more likely that the fish is male.
Believe these spots are what attract the females to the male hence fertilizing the eggs in her mouth
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Males liable to nip anal fins of females prior to spawning, even to the extent of killing them.
Length, 2 inches.
More Fish and Aquaria Information Here ...
But a week or two later I was shicked to discover a small (1/4") fry darting in the Java moss, already sporting red anal and caudal fins (ventrals are clear at that stage).
Anal Chem 2002 Feb 15;74(4):856-62.
Effect of copper on algal communities from oligotrophic calcareous streams. Guasch H., Maria P. and Sabater, S. University of Barcelona, Spain. J. Phycol. 38, 241-248 (2002).
There are differences at reproduction level, males and females differ as both body size and caudal and anal fins aspect. They are viviparous fish, because the females give birth to living fry.
The other method is to determine sex by the shape and appearance of the anal opening. If possible, separate the males from the females to avoid an accident before you set up.
The tropical fish male and female koi fish are easily distinguishable by one through the anal configurations. That relating to tropical fish males convey more concave anus plus their head include distinctive reproduction spots.
The anal fin has one "egg spot" at the very end. The tail fin has orange in the crook of the "v" shape and the eyes have orange in the iris.
Moliro: This variety is typically referred to as 'red'.
The anal fin on the Half Moon or a Half Moon Genotype is usually extended.
Breeding Male Trewavasae Cichlids can be identified by the presence of false egg spots on their anal fins, though some females may also have these. Often the anal fins of males are more pointed than those of females.
The anal fin is similarly extended. This elegant finnage is used in a remarkably vivacious display for females and rival males. The body is slender, laterally compressed and general metallic silver with slightly visible dark vertical bars.
The prime diagnostic feature, once Lemons are matured, is this: look at the black band on the anal fin. The female will have her anal fin edged with a fine black line, almost as if drawn with a fine-pointed eyeliner pencil.
Duncker placed the species in the genus Pelteobagrus, the members of whom are otherwise known only from East Asia, on the account of the number of branched anal-fin rays (14-15, whereas other Southeast Asian bagrids have only 7-9).
Barbonymus schwanenfeldii can be distinguished from other closely related Barbonymus species by its red dorsal fin with a black blotch at the tip, red pectoral, pelvic and anal fins, ...
Of the unpaired fins (i.e. consisting of a single fin), the most noteworthy are the dorsal and the anal fins.
Near the anal fin the color of the body may be solid black. Each scale will have a small black dot on it. The dorsal fin may have a bright yellow or orange sheen. The caudal fin will be a mix of yellow and green, from top to bottom.
When a female guppy is pregnant she will develop a dark triangular shaped gravid spot near her anal vent. This will get larger and darker as the pregnancy progresses.
The anal fin is situated ventrally, in line with the dorsal fin and containing approximately 7-18 soft rays. The caudal fin is either moderately forked or rounded. Pectoral fins are found just behind the gills.
Meanwhile the male displays the "egg spots" on his anal fin. These spots are the same size and color as the real eggs.
The fish possesses two sets of paired fins (the pectoral and the pelvics), and two single ones the dorsal and the anal (also known as the median fins) plus the caudal fin.
Males have long extensions to the dorsal and anal fins, and females - especially when they are in a breeding mood - get bright reddish bellies.
The male Marble Lyretail Molly has a pointed anal fin and a much larger dorsal fin. In contrast, the female Marble Lyretail Molly has a rounded anal fin and a pregnancy spot.
Brown spots adorn the dorsal, anal, and caudal fins. There are two dorsal fins separated by a small gap, this being a trademark of all Rainbowfish. The anal fin is quite long, while the tail fin comes to a modest fork.
Anal fin always extends beyond the base of the caudal fin.Above is the original form. A subspecies originating from Sumatra, Indonesia looks similar but has a blue groundcolor, and is known as Trichogaster trichopterus sumatranus, Ladiges, 1933.
Adult dominant males are extremely easy to sex - They have Black Anal and Ventral Fins and a Black Dorsal Fin with a bright yellow top stripe, ...
Male Platies are more slender than their female counterparts, and have a pointed anal fin on the bottom, closest to the tail. The females are more rounded, with a rounded anal fin.
Males will have larger pectoral fins than females, and the male has an indented anal fin, while the female's is straight edged. The pectoral fins are very large in both species and look much like wings.
The male impregnates the female by using a modified anal fin called a gonopodium. The fertilised eggs remain inside the female until they hatch and the live young are born as free-swimming miniature versions of their parents.
The males will have a pointed anal fin (gonopodium) and the females will have a rounded anal fin. Since these are big bellied fish it is sometimes hard to tell males from females. Females have a square stomach while males are more rounded.
Breeding: Sexing is done by looking at the anal fin which in males have a red seams. This species is easily breed. Floating plants promotes spawning.
They sport dark (dark purple to black) dorsal and anal fins which are trimmed in white and a caudal fin which is many times totally yellow.
Angelfish are laterally compressed or look like a disc on edge with long fins coming out of the top and bottom and have 2 'feelers' in front of the anal or bottom fin.
Sexual dimorphism: Male anal fin stucture is different, in the aquarium the difference is hard to see, but by observing the fish closely it is possible to distinguish the genderes on the basis of their behaviour.
Prices: Unknown.
The caudal fin and anal fins will get severely eroded. As the disease spreads, the skin is often appears numerous gray-white ulcers. Damage often occur at the gills and it may be the only affected area.
Within a few days the papilla should show on both the male and female (organ between the ventral and anal fin). The male's papilla is much smaller than the female's. Once egg laying begins you should avoid disturbing the tank.
This Apistogramma gibbiceps male has a rather colorful anal fin, some color in its caudal and has little coloration on its face.
The male members of this livebearing species have a gonopodium, a sex organ formed by the fusion of several rays of the anal fin. During mating, this gonopodium is directed forward, toward the female.
GENDER: imperceptible; the male is vividly colored, his dorsal and anal fins are more drawn out than the female's; his head is patterned with a sprinkling of reddish brown dots and wavy lines, which are absent in the female.
Males are generally much larger than females and will show long extensions on their dorsal and anal fins.
Sex can easily be determined by looking at the anal fin (the unpaired fin under the fishes belly). Females have a normal fan-shaped fin (similar to the two ventral fins nearby), while males have a rod-shaped organ that points straight back.
They are easy to sex, as the female is larger, and the male has a rod-like anal fin called a gonopodium that he uses to internally fertilize the female. After fertilization, the female can produce multiple batches of babies without a male present.
The single (rather than paired like the pelvic fins) fin located on the underside of the fish, behind the anus. Sometimes called the anal fin.
Venturi ...
 See also: Fish, Anal Fin, Water, Species, Aquarium
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