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• Morphometric and meristic variability in Butis koilomatodon in estuarine and coastal areas of the Mekong Delta

  Lam Thi Huyen Tran, Dinh Minh Quang

  Received: Jun 08, 2020 / Published: Dec 31, 2020

   Abstract PDF

  The study aimed to investigate morphometric and meristic variability in the mud sleeper Butis koilomatodon (Bleeker, 1849) in the Mekong Delta. This species is a commercial fish species with a small-size and is mainly distributed in some coastal areas from Tra Vinh to Ca Mau provinces. In the present research, the parameters of morphometry and measurement, including the head length, body depth, eye diameter, distance of the two eyes, and the interrelationships among the morphometric variables, were determined. The results revealed that the total length and weight of the fish changed by sex, season, habitat, and the interaction between the seasons and habitats. Likewise, the meristic criteria were different between males and females, and the dry and wet seasons, but not by their interactions. The growth rate of males was faster than females. The outcomes also showed that the body size of this species was larger in the dry season and the largest fish were found in Duyen Hai and Tra Vinh provinces. The Findings would be useful not only for further effects of environmental factors on morphology but also for comparisons between  congeners Butis morphologically.

• An Integrated Wireless Sensing System for Monitoring Environmental Parameters in Mushroom Houses

  Nguyen Kim Dung, Dang Thi Thuy Huyen, Nguyen Van Dieu, Nguyen Thi Bich Thuy

  Received: Aug 21, 2018 / Accepted: Aug 21, 2018 / Published: Aug 21, 2018

   Abstract PDF

  The paper presents an integrated wireless sensing system for monitoring environmental parameters, including temperature, relative humidity, and light intensity in mushroom houses. The developed system not only collects spatial environmental data but also enables end-users to remotely observe them via smart devices. Assembly of five sensornodes with a wireless sensor network was used to  gather data. The results have shown relatively accurate measurements in terms of environmental parameters. The system is low cost, simple and easy to operate by displaying the native language in interface monitoring software. Therefore, the generated system should be applied in monitoring air temperature, humidity, and light intensity in mushroom houses. Additionally, this study has provided good opportunities for Vietnamese farmers to approach the high technology application in agriculture.