FISH GONAD MATURITY STAGES


Fish Gonad Maturity Stages

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Can the age of a fish be estimated from the stage of gonad

In the summer May-July , the ovary grows quickly with obvious increases in weight, developing from stage IV to maturity with a gonad index of 17—20 per cent.

  • Crucian carp is close to common carp among Cyprinidae. In China, mainly Oreochromis mossambica and O.
  • The best way is to obtain samples over one year and to determine the average length of the young and the volume of their yolk sacs.
  • The transitional lobe is situated at the lower front of the anterior lobe and the posterior lobe is situated at the lower front of the transitional lobe Fig. After the formation of sperm cells, the spore sacs dissolve and the sperms enter this cavity.
  • The eggs must be incubated in the same temperature range as that required by brooders to spawn:

Under culture conditions, both species are omnivorous, feeding on oil cakes, brans, dregs, and animal feeds such as silkworm pupae, earthworm, and animal entrails. Silver carp, bighead, grass carp, black carp, and wuchang fish begin to die when the temperature falls below 0. Also stocks of the same species can be separated from statistically significant differences between values either of a or b in the fecundity-weight and fecundity-length relationships. Fecundity does not apparently relate to region, but to culture management mainly nutrients.

DESCRIPTION: Such phenomena should be apparent in the results after sampling throughout a complete sexual cycle. If the follicles did not release the mature eggs, the eggs would become overripe, and the rate of fertilization would certainly be adversely affected. The former refers to the total number of young born to one fish in one spawning season; the latter refers to the number of young born per gram of female body weight in one spawning season. Mud carp shows higher egg production because its eggs are much smaller Table 1.


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For example it is often difficult to separate males into 8 stages. The volume of the testes has greatly decreased after milt exudation, and the testes are now yellowish white or pink. The gill rakers of silver carp and bighead are situated in the operculum with four pairs on either side; the fifth pair is on the gill arch, which is specialized into the inferior pharyngoskeleton. Can the age of a fish be estimated from the stage of gonad maturity? It is adequate for many purposes but a more precise and more objective method is desirable in some causes. After milt exudation, the testes revert to stage III and redevelop from there. Balboutin, On the investigation of ovarial cycle and fecundity of fish with special reference to partial spawners.

Macroscopic determination of gonad maturity stages: Based on macroscopic characteristics, certain features were examined to identify the maturity stages. These . Maturity Stage in the Female Fish On the basis of shape, size, colour of the ovary and other histomorphological features, at least six maturity stages can be recognized. RESTING PHASE (Immature) The ovaries are small, thin, thread like, translucent, pale or dirty white in colour with inconspicuous vascularization.

Can the age of a fish be estimated from the stage of gonad maturity?

Chinese bream Maturitj to subfamily Abramidinae. Proper nutrition must be combined with other favourable Fish Gonad Maturity Stages conditions for the gonads to reach maturity. Its function is Maturoty maintain the genetic material deoxyribonucleic acid, DNAwhich controls cellular metabolism and is passed from one generation to the next. No trans- parent or translucent ova visible. He determined the occurrence of egg capsules in samples taken throughout the year and then equated the month in which the occurrence of egg capsules was at a maximum with the maximum rate of egg laying observed in aquaria 1 egg every 24 h.

Under culture conditions, both species can feed on all kinds of Fish Gonad Maturity Stages leaves, tender grass, animal manure, bran, oil cake, and pelleted feeds. At sexual maturity, eggs and sperm develop in the ovary and testis, respectively. Institute of Oceanology Polish Academy of Sciences. The gonad index is 3—6 per cent in this stage. The lipid content decreases gradually as the new oocytes accumulate Mwturity yolk.

The inconsistency of the expression and the use of the term ‘maturity stage’ probably arose because the first fish for which ‘maturity stages’ were described had one, clearly marked, annual breeding cycle with a long interval in which the gonads returned almost to their virgin stage. Table 1. Seven-stage Hjort gonad maturity scale developed for Atlantic herring and used during early phases of NEFC bottom trawl survey program .. ; .. 2 Table 2. Eight-stage FAO maturity classification scheme .. 2 Table 3A. Maturity Stage in the Female Fish On the basis of shape, size, colour of the ovary and other histomorphological features, at least six maturity stages can be recognized. RESTING PHASE (Immature) The ovaries are small, thin, thread like, translucent, pale or dirty white in colour with inconspicuous vascularization.

I am interested in finding significant differences in gene

  • Slight running water year round maximizes the spawning rate of silver carp.
  • Roe and milt run under slight pressure.

Among all these river systems, the spawning grounds of Changjiang River and Pearl River are the biggest. The females do not have mixopterygia. As they mature, their feeding turns to phytoplankton. This is the commonest type, at least in species of northern latitudes. This situation is found, for example, in North Sea mackerel, in sprats and in a number of species, such as Rastrelliger and Chilean hake, in tropical and sub-tropical waters.

Silver carp is used as an example to describe these six stages. At this stage, most of the eggs has been laid. Hello, I performed a set of inhibition experiments where Lactobacilli supernatants where tested against a pathogen cell culture. The testes also have a more flattened knife-edged shape than the ovaries. A fish must be able to carry out normal gas exchange and demands a certain amount of dissolved oxygen.

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