Larval stage followed by a stage of transformation. This stage is characterized by changes in the general shape and structural detail that can be gradually to abruptly. In most species of fish, larval forms and shapes are very different at the time of the juvenile.In the larval period, the fish undergo two phases of development, namely prolarva and post-larvae. Prolarva
traits are still the egg yolks, transparent body with a pigment of
unknown function, as well as the pectoral fins and caudal fin shape is
not perfect though. Mouth
and jaw are still underdeveloped and his intestines are smooth tube,
while the food is obtained from egg yolk unfinished absorbed. Usually the newly hatched fish larvae are in the reverse situation because the yolk still contain oil. Larval movement only occurs at any time by moving the tail to the left and to the right.The new larvae ditetasi has a total length of 1.21 to 1.65 mm with an average of 1.49 mm. The average length of 0.86 mm yolk sac. Initial pigmentation is not uniform, eyes, gastrointestinal tract, cloaca and caudal fins transparent. Three days after hatching, the yolk is absorbed most of the oil and grain size is reduced to insignificant. At this stage, an open mouth and jaws began to move when the larvae begin eating.There are approximately 2 steps baramundi pigmentation in larval fish. At the age of 10-12 after hatching, larval pigmentation appear dark gray or black. The second stage occurs between the ages of 25-30 days in which the larvae develop into tillers. At this stage, turned into a silver color pigmentation. It was observed that only healthy puppies at this stage are actively swim. They are always brightly colored. Larvae unhealthy dark or black colored body.Newly hatched larvae are passive because the mouth and eyes open so that its movement is not dependent flow of water. Newly hatched larvae are usually called larvae from 0 days (D-0) with a yolk reserves and the oil bubble. The size of the yolk reserves and the oil bubble and the oil bubble lies on the yolk depends on the type of fish. On
snapper and beronang, oil bubbles tend to be the location of the
approaching end of the head or the front, while the grouper larvae tend
to be further away from the head or closer towards the rear.
During the growth of the larvae undergo a fairly fundamental change, which is when the larvae aged 1-3 days (D1 - D3) egg yolk and oil grains will be reduced which ultimately absorbed in the body which then formed mouth and anal canal. From these results it can be assumed that the ability of the digestibility of the larvae is quite limited in the early days of the larvae given to this group of carnivorous fish, grouper larvae of sand has formed a new colon and bowel function as short so digesting food in relatively small quantities and relative time not long.
To so gut kept fully advised in conditions of artificial feeding frequency and nature as often as possible. However, the capacity of the stomach also help determine the extent of the amount of feed that the feed artificial dikonsumsi.Tampak strongly support the survival and growth in which the use of artificial feed as a substitute in part or whole to add, replace, or supplement natural food nutrients when required by the larvae. artificial feed should be given in time to feed can be digested and absorbed by the efficient manner in accordance with the larval development. Artificial feeding is late (over D25) can result in high mortality rates due to a lack of nutrients in natural food to meet the needs of larval life.
Past is past post larval fish from the loss of the yolk sac to form new organs or completion of level refinement of existing organs. At the end of the phase, larvae morphologically already has a body shape is almost like a parent. At this stage pascalarva dorsal fin (back) has begun to be distinguished, the existing line of the tail fin shape and children are more active fish swim. Sometimes these children showed clustered nature though not forever. After this pascalarva period ends, will enter a period of juvenile fish.
To so gut kept fully advised in conditions of artificial feeding frequency and nature as often as possible. However, the capacity of the stomach also help determine the extent of the amount of feed that the feed artificial dikonsumsi.Tampak strongly support the survival and growth in which the use of artificial feed as a substitute in part or whole to add, replace, or supplement natural food nutrients when required by the larvae. artificial feed should be given in time to feed can be digested and absorbed by the efficient manner in accordance with the larval development. Artificial feeding is late (over D25) can result in high mortality rates due to a lack of nutrients in natural food to meet the needs of larval life.
Past is past post larval fish from the loss of the yolk sac to form new organs or completion of level refinement of existing organs. At the end of the phase, larvae morphologically already has a body shape is almost like a parent. At this stage pascalarva dorsal fin (back) has begun to be distinguished, the existing line of the tail fin shape and children are more active fish swim. Sometimes these children showed clustered nature though not forever. After this pascalarva period ends, will enter a period of juvenile fish.
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