Thursday, November 24, 2011

metamorphose moonlight night

The Amphiron percula can grow to be 11cm in length, but is on average 8cm, and can be recognized by three white lines across their bright orange bodies, with no distinction in color between sexes. The anterior white bar is placed just behind the eye; the middle bar goes straight down the middle of the fish; and the posterior bar occurs near the caudal fin. An anterior projecting bulge also exists on the middle bar. In addition to the white coloring, black edging outlines each fin with varying thickness. This species can be mistaken for the similar species of clownfishes, A. ocellaris. This is known as the Ocellaris clownfish and sometimes referred to as the "false percula clownfish" or "common clownfish" due to its similar color and pattern. The "easiest" way to distinguish the two species is the fact that A. percula has 10 spines in the first dorsal fin and A. ocellaris has 11, which is a more reliable distinction than color patterns. The A. ocellaris does not have thick black edging outlining the fins.

Moonlight Night

Since these fish live in a warm water environment they can reproduce all year long. Each group of fish consists of a breeding pair and 0–4 non-breeders. Within each group there is a size-based hierarchy: the female is largest, the breeding male is second largest, and the male non-breeders get progressively smaller as the hierarchy descends. They exhibit protandry, meaning each fish is born male, but will only change to female if the sole breeding female dies. If the female dies, the breeding male changes sex, becomes the breeding female and the largest non-breeder becomes the breeding male. The spawning process is correlated with the lunar cycle. At night time the moon maintains a higher level of alertness in the A. percula and this increases the interaction with the males and females. Before spawning, the male attracts the female via courting behaviour. These courting actions include extending their fins, biting the female and chasing her. The males also swim rapidly in an upward and downward motion to attract the females. The nest site is also important for the survival of the eggs. Depending on the size of the female spawn about 400–1500 eggs per cycle. The expected tenure of breeding females is approximately 12 years and is relatively long for a fish of its size, but is characteristic of other reef fish.

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It has been unclear why the non-breeders continue to associate with these groups. Unlike non-reproductives in some animal groups, they cannot obtain occasional breeding opportunities, because their gonads are non-functional. They cannot be regarded as helpers at the nest, since it has been found their presence does not increase the reproductive success of the breeders. Recent research (Buston, 2004) suggests that they are simply queuing for the territory occupied by the breeders, i.e. the anemone; non-breeders living in association with breeders have a better chance of eventually securing a territory than a non-resident. The probability of a fish ascending in rank in this queue is equal to that of the individual outliving at least one of its dominants because an individual will ascend in rank if any one of its dominants dies, and not simply when its immediate dominant dies.

metamorphose moonlight night

Metamorphose- Moonlight Night OP

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