Bacteria associated with invertebrates are considered as good sources for biologically active compounds. Sponge-derived bacteria were screened antimicrobial activities, the presence of cluster genes polyketide synthases (PKSs) and non-ribosomal peptide synthetases (NRPSs), through a colony picking method. Crude extracts broth cultures tested microbial inhibition. Eleven out 25 isolated strains showed inhibition at least one eight indicator microorganisms. Antimicrobial activities observed in...

Marine bacteria are being considered for research and application in medicine, industry, aquaculture. Bacterial strains derived from the edible algae Caulerpa lentillifera corals were screened production of indole-3-acetic acid (IAA) - a phytohormone auxin group. The ability phosphate solubilization antimicrobial activities IAA-producing also implemented this study. potent identified by 16sRNA sequencing. isolate RN06 produced high amount IAA, used inorganic phosphate, inhibited Bacillus...

Coral associated bacteria and their host are currently one of the interested issues for research scientists worldwide. The densities zooxanthellae with three most prevalent species Acropora hyacinthus, muricata robusta in Hang Rai, Ninh Thuan was evaluated over time by staining SYBR Gold direct counting epifluorescence method. dominant were isolated culture dependent ranged from 0.39–1.83×107 cell/g, 0.83–2.52×108 respectively. Bacterial density 3 months significantly different compared to...

Microbial communities associated with invertebrates had been considered as a new source of bioactive compounds. The soft coral bacteria in Mot island, Nha Trang bay were isolated, extracted and assessed for antagonistic activity against human pathogens, the strongly active strains identified by 16S rRNA analysis. bacterium SCN10 abcd antibacterial pattern which was named inhibition towards Bacillus subtilis (pattern a), Escherichia coli b), Salmonella typhimurium c) Serratia marcescens d)....

Coral associated bacteria and their role for the host are currently one of interested issues research scientists worldwide. Search with some species hard coral in Hang Rai, Ninh Thuan found that strain VK2 was most abundant culture from Acropora hyacinthus. This bacterium implicated to further study antimicrobial tests Bacillus subtilis ATCC6633, Salmonella typhimurium ATCC6994, Escherichia coli O157, Serratia marcescens PDL100 by agar diffusion method on MHA. The identified as sp. VK2....

Bivalves play a significant role in providing food for humans. The bivalve, Paratapes undulatus (Born 1778) living the Da Nang estuary central Vietnam has been used as live many years. Based on results of field survey 2021-2022, this study clarified ecological and environmental properties studied area zoning distribution species. show that bottom water sediments estuaries were suitable development undulate venus clam. Moreover, influence river discharge rainy season limited clams mount areas...

The marine actinomyces Micrococcus was the most common bacterium among isolates corals, sponges, and alga isolates. Only a few investigations of natural compounds from sp. were reported previously. This study implicated soft coral-associated strain A-2-28 (following relative flavus LW4T) for large-scale cultivation, chemical analyses, biological activities. Whereas crude extract inhibited only Staphylococcus epidermidis, metabolites profiles pure showed that this produced phytohormone (IAA),...

Aquaculture stands as a vital marine economic sector in Vietnam's coastal provinces, with specific significance Ba Ria - Vung Tau. The steady growth of this plays pivotal role local socio-economic development. However, has led to legitimate concerns about environmental sustainability and progress. Building on the findings from sociological surveys conducted through questionnaires comprehensive interviews 2022, article applied Strengths, Weaknesses, Opportunities, Threats (SWOT) analysis...

Docosahexaenoic acid, or acid (DHA), plays a pivotal role in biological functions and is beneficial for both humans animals. Traditionally, DHA sourced from fish oil. Due to the disadvantages associated with these sources, such as marine pollution variable composition, there pressing need explore alternative, reliable sources DHA. Aurantiochytrium sp. has been identified promising candidate production. The primary aim of this study was cultivate three strains previously published media and,...

Monitoring fecal pollution using fecalindicator bacteria (fecal coliform - FC) and common aquatic pathogen group of Vibrios are crucial criteria for integration coastal zone mallagement.FC Vibrio were an alyzed following standard method. Density FC varied temporally not depend on total particulate organic matler (with R2= 0.55 R2 = 0.66) respectively. After 30 days ofohservatio 11, there was a sudden increase in number sediments. It significant relative to tow/particulate matter. excess the...

Marine microbiology is currently the topic that scientists worldwide are interested in with aim of searching for bioactive substances. In addition to inherent microorganisms marine sediments, other lives - associated have recently been more invested and important achievements pharmaceutical research applications gained last few decades. this article, we review milestones process looking “drugs from sea” focus on remarkable results microbes invertebrate their potential application drug...

Drug resistance is now an issue of deep scientific concern all over the world as more antibiotic resistant bacteria have been detected in many regions and countries recent years. Using antibiotics for aquaculture quite common developing including Vietnam. This causes spread environment. Testing was carried out commercial marine tourist zones Hon Mot Nha Trang bay with five different namely chloramphenicol, tetracycline, cefazolin, streptomycin, gentamicin on Mueller Hinton Agar. A total 18...

In recent years, coral associated viruses could play primal role in protecting health, yet their ecological traits are poorly investigated. this study, the abundance and life cycles (lysogeny lytic) of with contrasted health states (healthy bleached) were studied compared. addition, density bacteria Symbiodium also be determined by epifluorescence microscopy. The results showed that viral increased 1.2 times bacterial decreased 0.6 healthy corals compared to bleached ones. number...

The uptake rate of nitrate by leaves and roots was simultaneously investigated in the seagrass T. hemprichii collected from Lo river, Nha Trang. principle nutrient based on approaches Michaelis-Menten model. laboratory experiments were done ranges ambient concentrations separate water column roots. calculated results indicated that through higher than maximum (Vmax) 1,777.0 mgN/g DW/h 131.6 DW/h, respectively. From these results, river estimated at 52.2 mgNm-2h-1. value plays an important...

In the context of global climate changes, mangroves are not only considered as an important ecological region but also a source exploitation specific biological objects for researches and applications. this study, mangrove-derived bacteria were isolated screened antimicrobial producers. Also, strains with potential antibacterial activity identified by 16S rRNA gene analysis. Results showed that 43% 21 possessed activity. The strain R10 inhibition against all four indicator was Bacillus...

Streptomyces has been known as a source of natural bioactive substances so far. In this present study, the sponge-derived HM9 was optimised with number different carbon (C) and nitrogen (N) sources to evaluate broad-spectrum antibacterial ability. Starch (NH4)2SO4 were favourable growth strain HM9. casein suitable for activity against Vibrio, whereas lactose NH4Cl beneficial on inhibition standard indicator BacillussubtilisATCC 6633. There no overlap C N Gram-positive Gram-negative bacteria,...

El Niño and the prolonged warm sea surface temperature significantly impacted coral reefs caused bleaching in some parts of world. This study evaluated density symbiotic algae bacteria associated with three species, namely Acropora hyacinthus, muricata, robusta, collected Hang Rai, Ninh Thuan May, June, August 2016, June 2017. The number zooxanthellae each species was statistically significant correlated several environmental factors, suggesting that could play a key role health. microbial...

Pacific Oysters (Crassostrea gigas) is an introduced species form Japan and raised in Vietnam waters. Relatively little known about effect of stocking density on oyster filtration rate. So, the goal this study investigates rate based variation density. The was carried out with adult oysters similar shell size (range from: 7.0-9.8 cm; average: 8.28±0.51 cm) collected Nha Phu lagoon, Khanh Hoa province. first order kinetic model composite exponential were used to estimate (FR) reduction algal...

Snout otter clam Lutraria rhynchaena, a bivalve species, is delicious seafood and commercially maricultural species in the northern central provinces of Viet Nam. However, this cannot be developed expanded to meet market demand due insufficient seed supply. Normally, protocol artificial reproduction for bivalve, broodstocks are stimulated release eggs sperm. In case clam, induced spawning often used high thermal shock by weak sunlight exposure, but its results inefficient. Therefore, paper...

To assess the impact of antibiotic use in aquaculture Nha Trang bay, we conducted this study with aim assessing resistance opportunistic pathogenic bacteria isolated from water and sediment around shrimp/fish cages bay. 109 strains Vibrio, Salmonella-Shigella Aeromonas groups were surrounding environment farming areas Dam Bay Hon Mieu. Antimicrobial test these showed that Bay, TET (96.6%) NIT (92.5%) two antibiotics highest rates resistant while no to RIF. All 5 types had a statistically...