By Sascha W. Felix
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Extra resources for Advances in shrimp aquaculture management
Probably, the aquatic animal most commonly mistaken for post-larval shrimp is Acetes spp. (Sergestidae). They can be easily distinguished by their long, bright orange antennae which have a prominent sharp bend in them. Post-larvae of shrimps have short, colourless antennae. In addition, these larvae do not have statocysts (in live animals these appear like small bright spots to the naked eye) on the tail (Mysidacea), and their eyes do not extend laterally at a 90o angle (Sergestidae). The uropods of Mysidacea are not spread fan-like as in shrimp, but are parallel, directed posterior.
One reddish-brown chromatophore at the anterior end of the six abdominal segment laterally. Fenneropenaeus indicus More than eight chromatophores on the ventral side of the sixth abdominal somite. Present or absent of one reddish-brown chromatophore at the anterior end of the sixth abdominal segment. (b) Eight to 11 reddish-brown (sometimes bluish) chromatophores on the ventral side of the sixth abdominal somite. One reddish-brown chromatophore at the anterior end of the sixth abdominal segment laterally.
It is suggested that for lab-lab production in ponds with hard bottom, the soil should be tilled after drying. Tilling of soil helps largely in the mineralization of organic matter. However oxidization of acid sulfate soils may be harmful, particularly where fresh soil is exposed to the air. Hence tilling is not recommended for acid sulfate soils. Similar tilling of non-acid pond bottom soil on a regular basis is also not recommended. Tilling should be done only when the bottom is hard and earlier yield was low.
Advances in shrimp aquaculture management by Sascha W. Felix