aquarium and pond answers, information, articles, resources

Our Facebook Page to Follow: Aquarium/Pond Answers Facebook   DONATE

This is a great resource for answers, help, & advice to aquarium and pond questions not found elsewhere; With regular posts & article updates.
In our research; we use aquaculture, horticulture, medical, & university research to compile many of our articles.

  See our AQUARIUM ANSWERS DIRECTORY page for topics by category.  


What is a lateral line in fish? The functions and diseases of the lateral line.


By Carl Strohmeyer-PAMR 35+ years experience Updated 5/9/14

The Lateral Line in Fish as well as Lateral Line Disease or Head and Lateral Line Erosion (HLLE)

Blue Tang with Lateral Line erosion
The lateral line is a sense organ that consists of a row of scales that most fish have along their sides, extending from their head to tail. Under these scales are a system of fluid-filled canals and specialized cells which transmit vibrations to the brain of the fish.
The lateral line helps fish to detect movement and vibration in the surrounding water including predators and prey. The lateral line or similar organs in fish such as blind cavefish (which has rows of neuromasts on their heads) are used precisely to locate food without the use of sight.
Killifish can sense ripples caused by insects struggling on the surface of the water.
Scientific experiments with Pollack Fish have shown that the lateral line is also used for schooling behavior.


Lateral lines are usually visible as faint lines running lengthwise down each side, from the area around the gill covers to the area near the base of the tail. Sometimes parts of the lateral line are modified into electro-receptors (biological ability to receive and make use of electrical impulses), which are organs used to detect electrical impulses.


A Scientist in the 1960s named Sven Dijkgraaf argued convincingly that fish must use their lateral lines to detect water motion. This motion can be generated by the fish, water currents, or by some external moving object.
The lateral line in fish seems to have the ability of detecting the subtle movements of biological sources (prey fish or predator fish, for example) located some distance away. Many scientists believe that fish such as sharks can use these organs to detect magnetic fields as well.


There are receptors in the line, called neuromasts, each consist of a group of hair cells, these cell hairs are surrounded by a protruding cupula (an organ that gives an animal a sense of balance).
Neuromasts may occur singly, in small groups called pit organs, or in rows within grooves or canals, where by these neuromasts are referred to as the lateral line system.

The lateral line system runs along the sides of the body onto the head, where it divides into three branches, two to the snout and one to the lower jaw.
These neuromasts are usually at the bottom of a pit or groove in the fish, which is large enough to be visible.

Skates, rays and sharks usually have lateral-line canals, in which the neuromasts are not directly exposed to the environment, but communicate with it via canal pores.
The hair cells in the lateral line are similar to the hair cells inside the others vertebrates inner ear (such as the cupula in humans where hair cells within the cupula sense rotational acceleration), indicating that the lateral line and the inner ear share a common origin.
Some active fish that are constantly swimming tend to have more neuromasts in canals than on the surface, and the lateral line will be further away from pectoral fins, to reduce the noise generated by fin motion.

The lateral line system, found in many fish, is sensitive to differences in water pressure. These differences are thought to be due to changes in depth or to the current like waves caused by approaching objects.
When pressure waves cause the gelatinous caps of the neuromasts to move, bending the enclosed hairs, the frequency of the nerve impulses is either increased or decreased, depending on the direction of bending.

A swimming fish sets up a pressure wave in the water that is detectable by the lateral line systems of other fish. It also sets up a bow wave in front of itself, the pressure of which is higher than that of the wave flow along its sides.

These near-field differences are registered by its own lateral line system.
As the fish approach an object, such as a rock or the glass wall of an aquarium, the pressure waves around its body are distorted, and these changes are quickly detected by the lateral line system, enabling the fish to turn or to take other actions.
Because sound waves are waves of pressure, the lateral line system is also able to detect very low-frequency sounds of about 100 Hz or less.

An adaptation of the pressure-sensitive system is seen in the modified groups of neuromasts called the Ampullae of Lorenzini (special sensing organs, forming a network of jelly-filled canals), which are found in sharks, rays and a few bony fish.
The Ampullae of Lorenzini are able to detect electrical charges, or fields, in the water.

Most animals, including humans, emit a DC (Direct Current) field when in seawater. This is thought to be caused by electrical potential differences between body fluids and seawater and between different parts of the body. An AC field is also set up by muscular contractions.
A wound, even a scratch, can alter these electrical fields.


Yellow Tang with Lateral Line Disease and fin erosion
Often the lateral line in fish, marine in particular will get infections or degenerate from water conditions. Many believe Marine Head and Lateral Line Erosion is related to Hole in the Head (HITH).

The usual progression in marine fish of MHLLE (Marine Head and Lateral Line Erosion) is usually the development of small pits around the eye and on the head and adjacent area.
As the ailment progresses, the holes grow larger, eventually connecting to become larger lesions, eventually extending back along the fish's lateral line. The fins and gill covering will also often erode in more advanced cases, although MHLLE is seldom fatal.
Yellow Tangs for an unknown reason progress differently; they tend to lose their vibrancy and lighten in overall color, followed fin erosion, usually beginning with the soft tissue between the dorsal fin's rays.
In general Marine Angels and Tangs (Surgeonfish) seem to be the most susceptible to MHLLE.


Vitamin, immune system
Spirulina 20 High Vitamin C Fish Food Vitamin and mineral deficiencies such as Vitamin C and possibly Vitamin B complex are one very likely cause of degeneration from my experience.
Proper feeding of foods high in these vitamins such as Spirulina Algae will help in this case.
These deficiencies along with poor water quality (which often results in poor Redox balance) show the most evidence for being the major cause of this affliction.

More information about: Aquarium Redox

A Resource for: Spirulina Algae Fish Food Flake

Many have attributed high nitrates due to poor water quality as a possible cause, however although low nitrates are certainly important for long term health, I believe high nitrates play a minor role in how poor water affects HLLE in fish.
I believe from my own tests (as well as research) that the lack of minerals and vitamins in low quality water along with a poor Redox Potential are the main culprits. I have witnessed Yellow Tangs turn around with the addition of trace elements in client’s tanks that previously never supplemented them.

SeaChem Entice As stated earlier the use of products such as Spirulina Algae, high quality additives such as SeaChem Vitality (as a fish food soak), adding trace elements & complete buffers as well a simple and basic water changes using quality salts aids profoundly in maintaining proper mineral/vitamin levels in marine fish. This is especially important since marine fish constantly drink the water around them which makes their body chemistry very much like that of the water around them (somewhat of an over simplification though).
Also for finicky marine fish such as many Butterflies and Angels, the use of products that entice the fish to eat high quality prepared fish food that they might otherwise ignore is suggested; one excellent example is SeaChem Entice

A Great Resource for more about Marine Fish & how they drink water:
Aquarium Answers, Do fish drink water?

Another aspect of water quality, immune system health is the The Aquarium Redox Potential.
Without going into a long explanation, simply put a correct Redox potential acts as an anti-oxidant clearing away free radicals much the way many vitamins such as A, C and others do. Many aquarists are unfortunately unaware of this aspect of the aquarium keeping even though many human studies have shown direct correlation to correct Redox and lowering of free radicals.

PLEASE reference this article for more on this subject:
“The Aquarium Redox Potential”.
Also Reference:
UV Sterilizer use for Redox Balance


Another theory is that an un-grounded aquarium can cause electrical fields that both interfere and degenerate the lateral line in fish. You can test this by using a pocket multi-meter on AC volts with a probe in the wall ground and a probe in the water.

HOWEVER, newer evidence does not seem to support this theory which quite bluntly from my experience makes sense as I have witnessed many broken or leaking electrical devices over years that I can actually feel the “stray” electrical current by holding my hand just above the water or if I have an open cut, YET the fish do not seem to be affected UNTIL one completes the circuit. An example is a Pacu I witnessed that “bit” into a loose set of wires that a client had left hanging into the tank, all was fine until the fish “completed” the circuit.
My point is that there is NO completed circuit until you complete it with a ground, which you do when touching the water while standing on the ground.

For further information, please see this article: Stray Voltages Explained


Other HLLE theories include the use of activated carbon, however in admittedly non-controlled studies I have seen no difference in occurrence or cure with the use of carbon, however it is possible that many are not keeping up with trace elements, and have a poor Redox and then the addition of carbon might remove what little anti-oxidants there are in an aquarium, but I do not think one can safely state that the use of carbon will lead to HLLE.
Exposure to Copper is another theory, however once again since I used to use copper extensively many years back I never observed any such correlation.
Viruses, bacteria and parasites have also been blamed and once again I have not seen enough supporting evidence to support this theory as well.

Finally two more theories that do make sense (although not scientifically proven) are lack of sunlight or correct lighting.
Proper lighting (or lack thereof) is another parameter for a healthy lateral line in fish.
Full spectrum lighting such as a combination 6,400 K or 20,000 K bulb and Actinic (UVA) bulb will help with this. The thought is that full spectrum lighting aids in the assimilation of certain vitamins, much as in humans and Vitamin D.

Please reference this very in depth article:
Proper Aquarium Lighting

* The Krib- Lateral Line Disease
*Hypothesis of Head and Lateral Line Erosion in Fish, Part 1
* Hypothesis of Head and Lateral Line Erosion in Fish, Part 2
*Hypothesis of Head and Lateral Line Erosion in Fish, Part 3

Other Recommended Reference & Product Sites

Aquarium information for prevention of lateral line disease
Well researched and up to date aquarium and pond answers, help, and links. Based on 35 years of professional aquarium maintenance experience.

Reef Aquarium Care Basics for Lateral line disease prevention
Saltwater/Reef Aquarium Basics

*Aquarium Chemistry; Saltwater & Freshwater

*Fish Nutrition Information

*Marine Oodinium

Fluidized Sand Bed filters for aquarium health, lateral line disease prevention
TMC Premium FSB Filters

Premium, second to NONE Aquarium Bio Filters, that with optional Oolitic Sand can also maintain essential aquarium calcium levels, alkalinity, & electrolytes that are important to ALL Marine life, Goldfish, African Cichlids, Livebearers & more

EcoTech Radion Pro Versus AquaRay LED Lights

A must read article for those interested in the science of aquarium lighting, and not desiring to follow the many lemmings in cut & paste aquarium forums

Hydor Smart Wave Controller
Hydor Smart Wave Controller

• Promotes a healthy reef aquarium or similar aquarium environment where wave action is desired by recreating natural currents found in nature
• Synchronous program for currents typical of barrier reefs and alternate for tides

Aquarium & Pond Plumbing Parts

Difficult to find or unique parts found nowhere else!
Including: T Water Diverters, Hose Barb Adapters, Couplings, & Reducers, Ball Valves, Swing Check Valves, Return Adapters, Intake Adapters

Labels: , , , , , , ,

<< Home

This page is powered by Blogger. Isn't yours?

Article Research Sponsor
Remember, it is your purchases (both small & large) at our primary sponsor, AAP, that keeps these world class information articles free.
Or please consider a donation (especially International users of this information), even just $5 usd helps.
As our primary sponsor is AAP, which provides little income for its owner after paying staff (including to help others) & upkeep of this information!

If only 10% of users of this information donated $5, this information will be able to remain free in the future!


In Chronological order of writing with the newest at the top

  1. How to Treat Sick Fish
  2. Whirling Disease in Fish
  3. Reef Aquarium Chemistry Maintenance
  4. Use of RO, DI, Softwater in Aquariums
  5. Lighting Theory of a Planted Aquarium- RQE, PFY, PAS, & PUR
  6. Aquarium or Pond Bio Load
  7. Tuberculosis in Fish
  8. PUR vs PAR in Aquarium Lighting
  9. Head Pressure in Aquarium and Pond Water Pumps
  10. Fin/Tail Rot For Betta & ALL Fish
  11. Angelfish Virus/Aids
  12. Activated Carbon
  13. Fish Baths/Dips as an aid to treatment
  14. Streptococcus gram positive bacterium in aquariums, Eye Infections
  15. Hydrogen Sulfide
    production in anaerobic De-Nitrification for Aquarium/Ponds
  16. Fish Shipping
  17. Aquarium Size, Fish Stunting
  18. Aquarium Algae,
    BBA & Brown Algae in particular
  19. Aquarium Salt (Sodium chloride) in Freshwater Aquariums
  20. Betta Habitat; Wild Bettas to Domestic Betta environment parameters
  21. HITH; Hole in the Head Disease
  22. Aquarium Protein Skimmers, Ozonizers
  23. Power Head/ Water Pump Review
  24. Molly Disease/ Mollies in an Aquarium
  25. Basic Fish Anatomy, Fin Identification
  26. Aquarium Moving/ Power Failures
  27. Octopus as Aquarium Pets
  28. Aquarium Nitrates
  29. Ichthyophonus protists, fungus in fish
  30. Aquarium and Pond Filter Media
    Types; Mechanical, Bio, Chemical
  31. Aquarium Water Conditioners (also Pond)
  32. Fish Parasites; Trematodes & Monogeneans; Annelids and Nematodes;
    Flukes, internal worms, Detritus Worms (often confused with Planaria), Micro Worms
  33. Aquarium Silicone Application;
    DIY Aquarium Repair & Glass thickness
  34. Pond Veggie Filters; DIY Bog Filter
  35. The difference between Plaster of Paris and Aquarium Products such a Wonder Shells:
    Identification, prevention & Treatment
  37. AQUARIUM TEST KITS; Use & Importance
  38. SEXING FISH; Basics
  39. Chocolate Chip, Knobby and Fromia Starfish
  40. Freshwater Velvet & Costia
  41. Usnic Acid as a Fish Remedy
  42. Aquarium Heaters; Types, information
  43. The Lateral Line in Fish, Lateral Line Disease
    or Head and Lateral Line Erosion (HLLE)
  44. Tap Water use in Aquarium; Chloramines, Chlorine
  45. Can Black Ghost Knife fish give an electric shock?
  46. Bio Wheel Review; Do Bio-Wheels really work?
  47. How do Fish Drink?
    Use of RO Water
  48. Cyclops, and Predatory Damselfly larvae
  49. Betta with Dropsy;
    Treatment and Prevention of DROPSY in all fish
  50. pH and KH problems in African Cichlid Aquarium
  51. Aquarium Gravel, which size?
  52. Blue green algae, Cyanobacteria in Ponds/Aquariums

If you have found this site helpful (or the sister site Aquarium and Pond Information),
please consider adding a link to one of our articles from your own blog or website.

American Aquarium Products along with "Aquarium/Pond Answers", and our VAST library of aquarium & pond keeping information found NOWHERE else in the word is currently FOR SALE for the right offer from an entity that will carry forward this company's 35+ year legacy of unique information (this also includes several other web and blog sites as well).
Only serious inquiries from qualified potential buyers will be considered

Recommended Related Information Sites & Products from our family of PROFESSIONAL aquarium and pond websites:

For help with your Aquarium Chemistry:
Aquarium Chemistry; In Depth Information

World Class Aquarium Information
For unique aquatic products (most professionally tested) and information;
*American Aquarium

Free Shipping AAP

*Sponge Filters that far outperform all other brands or DIY:
*Patented Lustar Hydro Sponge Aquarium Filters

UV Replacement Bulbs/Lamps Directory:
*UV Bulbs directory

*A CLEAR POND; Care & Information

Fish Food Information:

Aquarium & Pond UV Sterilizer Use Articles
-Unique articles such as unique UV ideas as well as dispelling myths

Directions/ Instructions/Downloads; Aquarium Pond Products

#eBay Community Forum & Bullying, Customer Service

For Website Building/Hosting and who Aquarium Answers recommends (& uses for sister websites):
Website Hosting, powerful web site maker, ecommerce
Make a Website on

All articles are the copyrighted material of Carl Strohmeyer, these can be used ONLY in part and only with proper hyper link.
Use with Google Adwords/Adsense is STRICTLY prohibited without revenue sharing

Add to My Yahoo!

#Great Links
#Carl Strohmeyer; Biography
#Ocean Decor


For ALL questions, please refer these questions to:
Everything Aquatic Professional Forum Board