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Eggs are expelled from oval gonopores in the base of the third pereiopods of females, which are covered with a layer. In guys, sperm is expelled from gono pores which are covered by folds, arranged in the base of the fifth pereiopods.
The pereiopods incorporate chemoreceptor cells, which are delicate to watery concentrates of food and to salts (and may along these lines be associated with transient and regenerative processes).The left and right second legs (chelipeds) of M. rosenbergii are equivalent in size, dissimilar to some other Macrobrachium spp. In grown-up guys they become very long and arrive at well past the tip of the platform. Some outrageous models are appeared in Figure 2.
The tail (midsection) is plainly partitioned into 6 portions, each bearing a couple of members known as pleopods or swimmerets (as this name infers, they are utilized for swimming, as opposed to the strolling legs). The initial five sets of swimmerets are delicate. In females they have connection destinations for holding bunches of eggs inside the brood chamber(see beneath). In guys, the second pair of swimmerets is adjusted for use in lovemaking. This spinous projection is known as the informative supplement masculina.
The 6th pair of swimmerets, known as uropods, are firm and hard. The telson is a focal member on the last section and has an expansive point with two little spines which undertaking further behind the point. The telson and the uropods structure the tail fan, which can be utilized to move the prawn unexpectedly in reverse.
A synopsis of the portions and the elements of every extremity is given in Table 1.Postlarval prawns are typically a greenish earthy dim and now and again blue. Ordinarily there are unpredictable earthy colored, dim and whitish longitudinal streaks on the body. Orange spots might be obvious where the tail sections twist. The horizontal edge of the platform might be red. The reception apparatuses are frequently blue. The chelipeds are for the most part blue however the second chelipeds may likewise be orange (see underneath). The shade of the collections of prawns will in general be more splendid in more youthful creatures and by and large more obscure and blue or caramel in more established prawns (they become red when cooked).
Develop male prawns are extensively bigger than the females and the second chelipeds are a lot bigger and thicker. The top of the male is likewise proportionately bigger, and the mid-region is smaller. As indicated over, the genital pores of the male are between at the base of the fifth strolling legs. The top of the develop female and its second strolling legs are a lot more modest than the grown-up male. The female genital pores are at the base of the third strolling legs. An elective method for sexing adolescent prawns is appeared in Figure 3. The pleura (overhanging sides of the abdomenal fragments) are longer in females than in guys, and the midsection itself is more extensive. These pleura of the primary, second and third tail portions of females structure a brood chamber in which the eggs are conveyed among laying and bring forth. A ready or 'ovigerous' female can undoubtedly be distinguished on the grounds that the ovaries can be viewed as enormous orange-hued masses possessing a huge segment of the dorsal and parallel pieces of the cephalothorax.
Female prawns are at times alluded to as virgin females (V or VF), berried (egg conveying) females (BE or BF) and open brood chamber (spent) females (OP). Egg-conveying females are appeared in Figure 4. There are three significant sorts of freshwater prawn guys and various middle structures, which were not completely portrayed in the first FAO manual.
Each of the three significant sorts of guys are represented in Figure 5. The capacity to recognize these structures is significant in understanding the requirement for size the executives during the develop out period of culture (Annex 8). The primary kind comprises of blue hook guys (BC),which have amazingly long paws. The second sort of guys, now and again known as pipsqueaks, have little hooks and are presently called little guys (SM).
Despite the fact that this sort is comparative in size to more youthful adolescents, the prawns are a lot more established. The third sort of guys are known as orange hook guys (OC). OC guys have brilliant shaded hooks, which are 30 to 70% more limited than the paws of BC guys. The three significant sorts of guys can commonly be recognized by sight. Be that as it may, more dependable methods of figuring out which type guys are can be found in Karplus, Malecha and Sagi (2000). As referenced, various middle of the road male structures have likewise been perceived, including powerless orange paw (WOC), solid orange claw(SOC) and changing orange paw (TOC) guys. The relationship and change of these different male sorts, and their significance in size the executives is canvassed later in this manual(Annex 8).