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• Analysis the Results and Economic Efficiency of Blood Cockle Pond Farming inCa Mau Province, Vietnam

  Ngo Thi Thu Thao, Lam Nhu Anh

  Date Received: 29-03-2024 / Date Accepted: 21-06-2024 / Date Published: 12-06-2025

   Abstract PDF (VIETNAMESE)

  Thisstudywas carried out to evaluate the resultsand economic efficiencyof blood cockles farming in Cai Nuoc, Nam Can, and Phu Tan districts,Ca Mau province. The average farming area fluctuated between 0.9-2.7haandthe stocking sizerangedfrom 400-1,000 inds./kgwith the stocking density of50-70 inds./m2. The blood cockles were cultured in9.1-9.7 months, the harvested size varied from65.0-74.3 ind./kg andthe average yield from1.1to 1.2 tons/ha/cultivation season. The farmers inNam Candistrictobtainedthe highest income (VND325.76± 87.05million/ha/year), followed by farmers in Cai Nuoc district (VND190.80 ± 74.87 million/ha/year)and Phu Tan district (VND129.13 ± 82.59 million/ha/year). The profits variedamong districts and closely correlated to culturedarea, experience, density and stocking period of blood cockles. The survey alsoshowedseveraldifficulties of blood cockles farming in Camau province such as complete dependenceon nature, poor quality seed sources, diseases and lack of investmentcapital.

  DOI: https://doi.org/10.31817/tckhnnvn.2024.22.6.

• Gastrointestinal Tract Morphology and Clark Index of the Linecheek Tank Goby Glossogobius sparsipapillus Caught from Coastal Estuaries of Bac Lieu and Ca Mau Provinces

  Tran Tri Canh, Nguyen Huu Duc Ton, Nguyen Thi Thuy Hien, Dinh Minh Quang

  Date Received: 08-11-2020 / Date Accepted: 24-12-2020

   Abstract PDF (VIETNAMESE)

  This study was aimed to provide data on gastrointestinal tract morphology and the relationship of Clark indexand gender, season and sampling site variables of the Linecheek tank goby Glossogobius sparsipapillus. Fish specimens were sampled monthly using trawling nets from September 2019 to August 2020, at three sites in Bac Lieu and Ca Mau provinces. After catching, the samples were determined sex, total length and weight, gastrointestinal tract morphology, gut length and Clark index.The analysis results of 729 specimens showed that this species had a long and pointed snout, flattened head, the mouth was wide and oblique, the lower jaw protruded, and the incision extended to the front eye. There were many rows of teeth on each jaw. It was a carnivorous fish as its intestine length was shorter than the total length of fish (RLG ranged from 0.18to0.83(0.44 ± 0.00)). This species had a high energy storage capacity due to the high value of the Clark index. The Clark of this species varied with season, sampling site, month and season × sampling site, but not gender, gender × sampling site and gender × season. The results have contributed to understanding in future aquaculture of this species.