sp. nov. and sp. nov., isolated from phycosphere of marine algae.

Two Gram-negative, moderately halophilic, and motile rod bacteria, strains G2-23 and J2-29, showing catalase- and oxidase-positive activities were isolated from species of the marine algae and , respectively. Both strains optimally grew at 30 °C, pH 7.0 and 2% (w/v) NaCl.

sp. nov. and sp. nov., isolated from seawater.

Two Gram-stain-negative, catalase- and oxidase-positive, and aerobic bacteria, strains MSW7 and MSW13, were isolated from seawater. Cells of strains MSW7 and MSW13 are motile and non-motile rods, respectively. Strain MSW7 optimally grew at 25 °C and pH 7.

sp. nov., isolated from a marine alga and seawater.

Two Gram-stain-negative, aerobic and yellow-pigmented bacterial strains, designated K20-16 and MSW2, were isolated from a marine red alga ( species) and seawater, respectively. Both strains were oxidase-positive, weakly catalase-positive and non-flagellated rods with gliding motility. Menaquinone-6 was detected as the sole isoprenoid quinone in both strains.

sp. nov., isolated from marine red algae.

Two Gram-stain-negative, strictly aerobic bacteria, strains L1-7-SE and R6, isolated from marine red algae, were characterized. They shared 99.9 % 16S rRNA gene sequence similarity and a 100 % digital DNA-DNA hybridization (DDH) value, representing members of a single species.

Characterization of Flavobacterium aquimarinum sp. nov., a halotolerant bacterium isolated from seawater.

A novel, aerobic, Gram-stain-negative, non-motile, non-spore forming, rod-shaped bacterium, designated strain Dol 15-39, was isolated from a seawater sample near Geoje Island in the South Sea, Republic of Korea. The strain was found to be oxidase-negative and catalase-positive. The isolate was observed to grow at temperatures from 4 to 37°C, at salinities of up to 7%, and at pH levels from 6 to 9; moreover, it was not able to degrade starch, DNA, esculin, or tyrosine.

Stakelama algicida sp. nov., novel algicidal species of the family Sphingomonadaceae isolated from seawater.

We conducted a taxonomic study of two algicidal bacteria, designated strains Yeonmyeong 1-13 and Yeonmyeong 1-11, isolated from seawater off Geoje Island in the South Sea, Republic of Korea. The two novel strains were yellow-pigmented, halotolerant, Gram-stain-negative, strictly aerobic, non-spore-forming, rod-shaped bacteria. Both strains were able to grow at 5-39 °C, pH 5.

Characterization of Marinomonas algicida sp. nov., a novel algicidal marine bacterium isolated from seawater.

A novel Marinomonas-like, aerobic, Gram-reaction-negative, moderately halophilic, acidophilic, motile by a single polar flagellum, non-spore-forming, rod-shaped bacterium that showed algalytic activity, designated strain Yeongu 1-4, was isolated from surface seawater of Geoje Island in the South Sea, Republic of Korea. The strain was oxidase-negative and weakly positive for catalase. Growth of this bacterium was observed at temperatures from 4 to 42 °C, at salinities from 0 to 12 % and at pH from 4.

Porphyrobacter algicida sp. nov., an algalytic bacterium isolated from seawater.

A novel Gram-stain-negative, yellow-pigmented, catalase- and oxidase-positive, non-endospore-forming, flagellated bacterium, designated strain Yeonmyeong 2-22, was isolated from surface seawater of Geoje Island, Republic of Korea. Strain Yeonmyeong 2-22 showed algalytic activity against the seven strains tested: Cochlodinium polykrikoides, Chattonella marina, Heterosigma akashiwo, Scrippsiella trochoidea, Heterocapsa triquetra, Prorocentrum minimum and Skeletonema costatum. A taxonomic study was carried out based on a polyphasic approach to characterize the exact taxonomic position of strain Yeonmyeong 2-22.