Luminous microflora associated with the fishes Mugil cephalus and Tachysurus arius

Ramesh, A

doi:10.1016/0378-1097(88)90009-2

Cited by 6 publications

(14 citation statements)

References 15 publications

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“…for instance. Certain fish species live in symbiosis with luminous bacteria, such associations being known from warm marine areas (HERRING and MORIN, 1978;RAMESH and VENUGOPALAN, 1988). However, the results by RAYMOND and DE VRIES (1976) point to the possibility that luminous bacteria may also occur in the gut of fish species which live in comparatively cold water.…”

Section: Discussionmentioning

confidence: 99%

Habitats and Distribution Patterns of Marine Luminous Bacteria in the Western Baltic Sea

Schulz¹,

Rheinheimer²

1995

Intl Review of Hydrobiology

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Numbers of luminous bacteria were counted at three stations of the brackish water ecosystem of the western Baltic Sea from July 1985 to July 1986. Additional samples were taken during three cruises from stations at the North Atlantic Ocean, the Norwegian Sea and adjacent marine areas. -In Kiel Bight (western Baltic) values varied between 0 and 68,000 luminous cfu I-'. With exception of the coastal station a distinct seasonal distribution pattern was shown in a water depth of 20 m: high numbers found in summer were opposed to low numbers in winter, the peaks being rather high in comparison to those of other areas. Statistical analysis showed that the results of 20 m were significantly different from those of 0 and 10 m depth; however, there was no correlation with temperature and salinity. Taxonomic studies revealed that the population consisted primarily of the genus Photobacferiiirn. -The optimum of salinity was not a brackish but a marine one and was about 30%0 for the majority of the strains tested. A smaller number of strains grew best at a salinity between 10 and 15%. Optima of temperature ranged from 15 to 20 "C for most of the test strains. -Taxonomic analysis was also performed with luminous strains from marine areas adjacent to the western Baltic Sea. Phofobacferiirm being the dominant genus here, too. Luminous bacteria were also enriched from the external surface and the gut contents of whitings (Merlangiiis merlangus) and cods (Gadus morhun). A model is proposed which explains the distribution pattern found. According to this. the gut-dwelling luminous bacteria are transported by their hosts from the North Sea into the western Baltic Sea. Here they are released into the environment, thus inhabiting another niche.

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Section: Discussionmentioning

confidence: 99%

Habitats and Distribution Patterns of Marine Luminous Bacteria in the Western Baltic Sea

Schulz¹,

Rheinheimer²

1995

Intl Review of Hydrobiology

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“…The association of luminous bacteria with the gastrointestinal tract of marine animals have already been reported (Ruby & Morin 1979;O'Brien & Sizemore 1979;Ramesh & Venugopalan 1987). They were found to produce histamine in seafoods, thereby contributing towards the spoilage of fish Morii et al 1986).…”

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confidence: 83%

Response of enteric luminous bacteria to environmental conditions in the gut of the fish

Alluri

Venugopalan

1989

Journal of Applied Bacteriology

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The response of luminous bacterial cultures to conditions encountered in the fish gut such as neutral pH, the presence of bile salts, gastric juice and lysozyme was examined. The organisms preferred neutral pH. Bile salts did not inhibit their growth. Neither lysozyme nor gastric juice affected their growth and viability to any extent. In the light of these findings, the adaptability of luminous bacteria to conditions existing in the gut of fish was discussed.

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“…Although luminescence of dead fish was a well-known phenomenon, one of the first mentions of the presence of luminescent bacteria in fish slime and intestinal contents is only from the beginning of the 1930's (Stewart, 1932). Since then, the high occurrence of luminous bacteria in fish intestines has been reported in many studies (Baguet and Marechal, 1976;Barak and Ulitzur, 1980;Liston, 1957;Makemson and Hermosa, 1999;O'Brien and Sizemore, 1979;Ramesh and Venugopalan, 1988;Reichelt and Baumann, 1973;Ruby and Morin, 1979). Most of hosts with internal light organ release luminous bacteria into the digestive tract (Haygood, 1993;Nealson and Hastings, 1979), and thus may largely contribute to their abundance in luminous fish intestines.…”

Section: Occurrence In Marine-fish Gutsmentioning

confidence: 98%

“…phosphoreum as the dominant luminous species found in fish guts (Reichelt and Baumann, 1973;O'Brien and Sizemore, 1979;Ramesh and Venugopalan, 1988). Interestingly, a high proportion of luminescent bacteria (>70 %) has been found in the gut of an Atlantic halibut recently fed, while an individual male in spawning condition, that had not been eating recently, had a flora dominated by non-luminescent microorganisms (Verner-Jeffreys et al, 2003).…”

Section: Occurrence In Marine-fish Gutsmentioning

confidence: 99%

Reviews and syntheses: Bacterial bioluminescence – ecology and impact in the biological carbon pump

Tanet¹,

Martini²,

Casalot³

et al. 2020

Preprint

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Abstract. Around thirty species of marine bacteria can emit light, a critical characteristic in the oceanic environment where the major part is deprived of sunlight. In this article, we first review current knowledge on bioluminescent bacteria symbiosis in light organs. Then, focusing on gut-associated bacteria, we highlight that recent works, based on omics methods, confirm previous claims about the prominence of bioluminescent bacterial species in fish guts. Such host-symbiont relationships are relatively well established and represent important knowledge in the bioluminescence field. However, the consequences of bioluminescent bacteria continuously released from light organ and through the digestive tracts to the seawater have been barely taken into account at the ecological and biogeochemical level. For too long neglected, we propose to consider the role of bioluminescent bacteria, and to reconsider the biological carbon pump taking into account the bioluminescence effect (bioluminescence shunt hypothesis). Indeed, it has been shown that marine snow and fecal pellets are often luminous due to microbial colonization, which makes them a visual target. These luminous particles seem preferentially consumed by organisms of higher trophic levels in comparison to non-luminous ones. As a consequence, the sinking rate of consumed particles could be either increased (due to repackaging) or reduced (due to sloppy feeding or coprophagy/coprorhexy) which can imply a major impact on global biological carbon fluxes. Finally, we propose a strategy, at a worldwide scale, relying on recently developed instrumentation and methodological tools to quantify the impact of bioluminescent bacteria in the biological carbon pump.

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Luminous microflora associated with the fishes Mugil cephalus and Tachysurus arius

Cited by 6 publications

References 15 publications

Habitats and Distribution Patterns of Marine Luminous Bacteria in the Western Baltic Sea

Habitats and Distribution Patterns of Marine Luminous Bacteria in the Western Baltic Sea

Response of enteric luminous bacteria to environmental conditions in the gut of the fish

Reviews and syntheses: Bacterial bioluminescence – ecology and impact in the biological carbon pump

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