<h1 class="pgc-h-arrow-right" data-track="1" ></h1>
For himself just entered the nursery car to learn white shrimp seedlings of the little white, at the beginning to see the seedlings like a headless fly, can not find the direction, with a beaker from the seedling pond to pick up the seedlings to observe, do not know what needs to see, even the basic shrimp seedling stage can not be distinguished, let alone look at the water quality, look at the bait, see the dynamic changes, want to let the technician teach the basic shrimp fry common sense, he said that he went to the workshop to observe, more observation. I watched the seedlings in the workshop for a few days, and I didn't see any fame, there was no way but to take shortcuts, I quietly took the reference book, took the seedlings to the bottom of the microscope to see, compared the pictures and texts one by one, tracked for a few days, and summarized the characteristics of each period. The gap between the shrimp fry under the microscope and the seedlings raised with a beaker is a bit large, and many features cannot be applied, because they cannot be observed at all, so they can only grasp the most significant features, the most easily distinguishable features.
Normal arthropod Naup of Penaeus vannamei
<h1 class="pgc-h-arrow-right" data-track="5" >2, learn to identify the stages of shrimp fry development</h1>
1、蚤虾(ZI.、ZII.及ZIII.)
The technician taught me the most intuitive method, the easiest to distinguish is to see the body ratio of shrimp fry, ZI. the ratio of head and torso is close to 2:1, ZII. the ratio of head and torso is close to 1:1, ZIII. the ratio of head and torso is close to 1:2, grasping this recognition ratio is generally more accurate; in addition, there are some more obvious features, such as ZII. The two compound eyes in the late period are easy to see, and there is a clear transparent ring on the abdomen near the tail fan in the early ZIII.
Microscopy observes phase Z I
Microscopic observation of phase Z II
Microscopic observation of phase Z III
2、糠虾(MI.、MII.及MIII.)
Mainly to see the development of the abdominal limbs (swimming foot), the technician said that in fact, can also be judged by the floating posture of the shrimp fry in the water, MI. when it is completely "top-heavy", the shrimp fry body is almost vertically upside down, the head is down, the swimming is completely dependent on bouncing, MII. When the body's suspended head begins to tilt upwards, you can see the swing of the abdominal limbs, MIII. When the head can be in a horizontal state, but still will not swim forward, the abdominal limbs swing strongly.
Microscopy observes phase I
Microscopic observation of phase M II
Microscopic observation of phase M III
3、Shrimp (PL)
Shrimp fry can swim forward autonomously, when the seedlings look at the general will swim against the current, to the bottom of the cup, and the shape of the adult shrimp is basically the same, very easy to distinguish, it should be noted that the staging of the shrimp is not determined according to the number of molting, but according to the number of days after the shrimp to determine.
Microscopic observation of early PL
Late PL
4. The next step
After learning to distinguish the various stages of shrimp fry, begin to turn to shrimp fry state, water quality, bait, feces, diseases and dynamic changes, etc., this is actually a long way to go, learn to see these need a long time to learn and accumulate, but also need the careful guidance of technicians, establish the correct orientation, the rest is to see the individual diligence, the so-called "master leads the door, cultivation depends on the individual."
Shrimp fry normally for sale
To be continued, if you want to know more about the dried seedlings, please keep an eye on it...