Factors Affecting the Salinity Intrusion at the Paddy Field in Thua Thien Hue Province, Vietnam

Background: Several coastal regions in Vietnam have been suffered from salinity intrusion as a consequence of global climate change. However, there are limited studies on saline intrusion in Vietnam. This paper aimed to investigate the salinity intrusion of water and soil samples in paddy fields along Tam Giang lagoon, Thua Thien Hue province and clarify the factors affecting the salinity level. Methods: We measured the salinity concentrations (EC, Electrical conductivity) of water and soil samples in paddy fields at different distances (400, 600, 800, 1000 and 1200 m) from Tam Giang lagoon. The multiple regression analysis was performed to figure out the factors affecting the salinity concentrations. Result: The salinity concentrations of water were assessed as 48% high saline (10-25 dS m-1), 34% moderately saline (2-10 dS m-1), 2% slightly saline (0.7-2 dS m-1) and 15% non-saline ( less than 0.7 dS m-1). As for surface soil in paddy field, 14.3% moderately saline (4-8 dS m-1), 35.4% slightly saline (2-4 dS m-1) and 50.3% non-saline (0-2 dS m-1) were measured. A significantly positive correlation was found between salinity concentrations of water and soil (n = 175, r = 0.886, p less than 0.01). The distances from salinity sources, Tam Giang lagoon and shrimp pond, were major factors affecting the salinity concentrations. The paddy fields near Tam Giang lagoon and shrimp pond have higher salinity concentrations compared to those areas close to the residential area. The surface water in the paddy field within 1000 m from the salinity source was assessed as saline that might harm the paddy soil and rice production. The results of this study provide highly useful information for local policymakers and farmers about the status of salinity intrusion in paddy land.

The correlation between ectoparasite infestation and total Vibrio parahaemolyticus bacteria in Pacific white shrimp (Litopenaeus vannamei) in Super Intensive Ponds

This study aimed to determine the type, intensity, degree of ectoparasite infestation and its correlation to the total V. parahaemolyticus bacteria in super-intensive pacific white shrimp culture. In this study, sampling was carried out in 3 super-intensive pacific white shrimp pond areas spread out in East Java, namely Bangil, Tuban, and Lamongan with 50 shrimps (PL30-PL 40). The obtained data underwent regression and correlation analysis. Based on the results, there were three types of ectoparasites, namely Zoothamnium sp., Epistylis sp. and Vorticella sp. High ectoparasite intensity was found in pacific white shrimp from Lamongan and Tuban ponds, namely 76 and 55 individuals/shrimp, respectively, showing the heavy infestation. High total V. parahaemolyticus bacteria was found in Tuban (1.16 × 105 CFU/gr) and Lamongan (1.16 × 105 CFU / gr) ponds. Based on the results, the coefficient value was R = 0.807 showing positive correlation of V. parahaemolyticus with the increasing parasite intensity and low oxygen levels.

Analysis of Factors Affecting Vannamei Shrimp Production During the Pandemic (Covid-19) in Mawasangka District Central Buton Regency

This research was conducted in Mawasangka District, Central Buton Regency. This research determines how much vannamei shrimp production is and analyzes what factors influence vannamei shrimp production. The population in this study was 45 vannamei shrimp farmers. Sampling in this study was using the census method, where researchers took the entire population of vannamei shrimp pond farmers in Mawasangka District. The analysis was used to determine the number of products produced by vannamei shrimp farmers using quantitative analysis with rumours of productivity and production function of Cobb Douglass to examine the factors that influence production. The results showed that the total production of vannamei shrimp was 14,319 tons, with an average output of 318 kg / 2HA. Factors that significantly affect the production island area (X1 ), Shrimp (X2 ), and Feed (X4 ) where the results uj i in getting the Sig and n use-values the coefficient of determination is 0 .563, which means production factors size fries, lime. Feed collectively together has an influence on the production amounted to 56.7%.

APPLICATION OF ZERO WASTE TECHNOLOGY IN SOLID WASTE OF SHRIMP TAMBAK IN SRIMINOSARI VILLAGE, LABUAN MARINGGAI, LAMPUNG TIMUR

The application of zero waste technology in the handling of pond sludge is an alternative solution that can be done to overcome the problem of decreasing the productivity of shrimp ponds.This activity aims to provide guidance to shrimp farmers in the Sriminosari Village to apply zero waste technology in handling solid waste and processing it into a planting medium. The method of activity is carried out through technical approaches and guidance in the field. The activity target is a group of productive partners in the Sriminosari village. Partner groups gain an understanding of zero waste technology through guidance both theoretically and practically in the field. This activity was attended by 10 participants consisting of shrimp pond owners, Karang Taruna, and representatives from UKM Pemuda Sriminosari. The evaluation results show a very significant increase in understanding the concepts of zero waste (theoretically) in participants. Through technical guidance, a tool of a suction sludge with a capacity of 200 m3 per minute was successfully designed and equipped with 10 drums of sludge filter. Furthermore, the sludge waste has also been successfully processed into a media for planting. Based on the results, it can be concluded that there is an increase in the ability of partners in terms of implementing zero waste technology in handling solid waste in shrimp ponds. In addition, there is a new business opportunities related to shrimp pond maintenance services and businesses based on processing solid waste in shrimp ponds.