Spawning detection device for the black tiger shrimp Penaeus monodon broodstock

Tác giả: Nongyao Mueangdee Nhóm: Tiếng anh Định dạng: pdf Dung lượng: 1Mb Ngày đăng: 19/01/2013

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This research is aimed at developing an automatic spawning detection systemfor the black tiger shrimp, Penaeus

monodon. This systemis composed of instrumentswhich are attached to the innerwall of the spawning tank that

contains light sensing circuitswhich change light intensity into electrical signals. The detection unit is composed

of a polyvinyl chloride (PVC) pipe containing a light emitting diode (LED) bulb that serves as a light source trans-

mitter, and a light-dependent resistor (LDR) that serves as a light receiver which transforms light intensity into

electrical resistance. Placed between the LED bulb and the LDR is a 135 μm nylon mesh screen that is stretched

horizontally inside the pipe to ﬁlter out shrimp eggs. Changing signals from the LDR turns on (or off) a 220 V

bulb. This device detects spawning activity as early as 22 s after the onset of spawning. There is a correlation

that exists between the number of spawned eggs and the time of the onset of spawning, with earliest detection

occurring with the highest number of eggs.

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