Photobacterium

Key takeaways

Photobacterium belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Photobacterium to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Photobacterium from memory before moving on to harder problems.

Reference excerpt

Photobacterium is a genus of gram-negative, oxidase-positive and catalase-positive bacteria in the family Vibrionaceae. Members of the genus are bioluminescent, that is they have the ability to emit light. Many species, including Photobacterium leiognathi and Photobacterium phosphoreum, Photobacterium ganghwense, Photobacterium marinum live in symbiosis with marine organisms. S.I. Paul et al. (2021) isolated and identified multiple strains of Photobacterium from marine sponges of the Saint Martin's Island Area of the Bay of Bengal, Bangladesh. Species such as Photobacterium profundum are adapted for optimal growth in the deep cold seas making it both a psychrophile (an organism capable of growth and reproduction in cold temperatures) and a piezophile (an organism which thrives at high pressures).

Biochemical characteristics of Photobacterium species Colony, morphological, physiological, and biochemical characteristics of Photobacterium species are shown in the Table below.

Note: + = Positive; – =Negative; V =Variable (+/–)

Taxonomy There are currently 16 species with numerous subspecies known within the genus Photobacterium. The development of 16S RNA sequencing has led to many species being shifted into and out of this genus. Photobacterium can be distinguished from other genera based on identifiable characteristics.

Identifying characteristics Morphological shapes are straight or plump rods Cell wall structure is classified as gram-negative Require sodium for growth Contain 1-3 polar flagella Are luminescent Incapable of forming resistant endospores Are chemoorganotrophs

Ecology Photobacterium are primarily marine organisms (hence the use of sodium for growth). They may be free-living or found as colonies associated with certain species of fish. These organisms do not contain any pigmentation and therefore will appear white or colorless. When there is a high density of cells forming a colony, they will exhibit fluorescence. However, the fluorescence is based on the accumulation of autoinducers which is proportional to cell density and therefore free-living photobacterium will not fluoresce. Their association with fish may be: symbiotic growth within fish for the formation of light organs, as a neutral entity on the surface or within the intestines of fish, as decomposers of dead fish, or as an agent of disease.

Pathogenicity Some of the 15 known species of Photobacterium have evolved into pathogens of marine life. Some of these diseases affect commercially important fish and can therefore indirectly impact human health through their consumption. This genus has been shown to degrade the chitin of the Deep Sea Tanner Crab (Chionoecetes tanneri). The species Photobacterium damselae are among the most virulent and are divided into two subspecies: piscicida and damsela. P. damselae subspecies piscicida is the causative agent of fish pasteurellosis. Bacterial colonies grow on the infected fish's spleen and kidney, eventually leading to mortality. This disease accounts for severe losses in some fish farming enterprises with some of the most susceptible fish including Yellowfin tuna (Thunnus albacares), certain Seabreams (Sparus spp.), Striped bass (Morone saxatilis), and White perch (Morone americana).

Photobacterium damselae subspecies damsela Fish-virulent strains of this subspecies of P. damselae cause septicemia in species of fish such as; damselfish (Family Pomacentridae), eels (Anguilla anguilla), sandbar/brown sharks (Carcharhinus plumbeus), Yellowtails (Seriola quinqueradiata), seabreams (Sparus spp.) and turbots (Scophthalmus spp.). This subspecies has been shown to be pathogenic for humans as it has been isolated from human wounds and has been shown to cause primary septicimia in healthy humans.

Symptoms of Photobacteria damselae subspecies damselae Fish infected by the subspecies damselae initially experience a reduced appetite accompanied by lethargicness and ulcerative lesions along their flank and head regions. Their stomachs will distend and they will experience extensive hemorrhaging especially in their eyes, mouth, and musculature. There will also be petechiation of the gills and liver along with the characteristic accumulation of mucus around the gills. It has been noted that the infected fish will swim violently a few minutes before death occurs.

Transmission/infection of Photobacterium damselae subspecies damsela Evidence of epizootic outbreaks, gained from an increase in ulcers noted among the fish populations, seem to correlate to warmer seasons, suggesting a seasonal distribution in the incidence of the disease, dependent upon the waters temperature and salinity along with a decreased resistance caused by physiological changes experienced by the host during sexual maturity. Seawater is the most likely mode of transmission of the virulent cells of the pathogen. Once it comes into contact with the outer surface of the fish, it is able to adhere to skin and resist the bactericidal action of the skin mucus layer, thus suggesting that the skin is the site of entry into the host. This bacterium could therefore represent a significant threat to aquacultured fish species, especially those living in crowded and stressed conditions, where the spread of the disease could be accelerated through direct contact and thus pose a threat to humans.

Worked examples

Example 1 — a first encounter with Photobacterium

Start with the simplest possible case. Write down what Photobacterium claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Photobacterium before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Photobacterium ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Photobacterium

In research: Photobacterium appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Photobacterium in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Photobacterium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bacteria genera, Bioluminescent bacteria, Gram-negative bacteria, so understanding it makes those chapters shorter.
In everyday life: Look for Photobacterium outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Photobacterium in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Photobacterium means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Photobacterium out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Photobacterium in simple terms?

Photobacterium is a genus of gram-negative, oxidase-positive and catalase-positive bacteria in the family Vibrionaceae. Members of the genus are bioluminescent, that is they have the ability to emit light.

Why does Photobacterium matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Photobacterium?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Photobacterium.