Fiddler Crab Care Guide, Tank & Habitat Profile

The fiddler crab is a briny water varieties of crab of the Ocypodidae household. This varieties is connected to greater than 100 various other varieties of semi-terrestrial aquatic crabs.

Fiddler crabs obtain their names from the look of the male crab’s claws– one distinctly huge claw held like a violin or fiddle. These crabs are little, serene, as well as friendly animals.

The fiddler crab makes a fascinating enhancement to a fish aquarium, as well as this varieties is prominent among newbie aquarists due to the fact that it’s simple to take care of as well as maintain.

Fiddler Crab Information & & Review

Fiddler crab facts and overview


Taxonomic name: Uca spp., Ocypodidae household
Typical names: Fiddler crab, marsh fiddler crab, red-jointed fiddler, China-black fiddler, sand fiddler crab, marsh fiddler crab, calico fiddler
Circulation: Throughout the globe in the Atlantic, Eastern Pacific, as well as Indo-Pacific
Dimension: 2– 3 inches
Life span: Approximately 3 years
Shade: Black with brown claws
Diet Plan: Omnivore
Character: Serene
Minimum storage tank dimension: 10 gallons
Temperature Level: 75– 86 °F( 23– 30 ° C)
pH: 8.0– 8.3
Solidity: 8– 25 dGH
Treatment degree: Easy


The fiddler crab is located around the globe as well as projects in mangroves, on sandy or sloppy coastlines, as well as in salt marshes in the Western Atlantic, West Africa, Indo-Pacific, Eastern Pacific, as well as Portugal.

These crabs are located perfectly on sea coastlines in the intertidal area, as they have the special capacity to make it through ashore as well as immersed in water.

Grownup Dimension & & Life-span

The mature grown-up dimension of a fiddler crab is 2– 3 inches. Men are bigger as well as larger than women.


In the wild, fiddler crabs live for concerning 2 years, however they live for as much as 3 years in bondage.


Fiddler crabs are typically readily available in water shops, along with on-line industries like The typical price of a fiddler crab is $4.50–$ 6.

To guarantee fiddler crabs are healthy and balanced as well as properly reproduced, purchase them from trustworthy on-line shops, consisting of:

Look & & Actions

Fiddler crab appearance

The fiddler crab has a blue, black, or brownish shell (covering). It is a friendly varieties that connects with its claws.

This crab is little, pleasant, as well as just reveals aggressiveness throughout the breeding period.

Color Styles, Patterns, as well as Dimension

Fiddler crabs have square-shaped bodies as well as smooth shells– tough plates securing the body organs– in tones of brownish or grey.

Men are brighter in shade contrasted to women as well as have a solid purple-gray or blue tone to their coverings. Ladies have 2 little feeder claws, while men have one extra-large claw (maturing to 2 inches long) as well as one normal-sized claw.

Mature fiddler crabs get to in between 2 as well as 3 inches long, as well as men expand larger than women. On the front of the crab’s body are 2 little eyes that stick out from long, slim eyestalks, as well as a set of antennae that are utilized to find scents on the surface.

The specific shade of a fiddler crab depends upon the varieties, with shades varying from orange-brown to blue-gray. The red-clawed fiddler crab, which has bright-red claws, is a commonly equipped shade variant of the varieties.

In the wild, fiddler crabs transform shade around springtime trend as well as reduced trend, when reproducing task is high. Fiddler crabs likewise transform shade as a feedback to tension, to control their inner temperature level, or to match the shades of their atmosphere.


Regular Actions

Fiddler crabs are serene, friendly crabs that interact with each other by elevating as well as reducing their claws. The crabs are just hostile as well as territorial throughout reproducing, as well as the men are understood to combat with their claws when they complete for the women’ focus.

Fiddler crabs have the ability to make it through in as well as out of the water as well as have a primitive lung for breathing air, as well as gills for breathing undersea. The crabs are semi-terrestrial, as well as split their time in between discovering the substratum undersea as well as remaining on land.

Fiddler crabs delight in being exposed, however they’re understood to conceal when frightened or molting.

The fiddler crab molts every 8 weeks, dropping its old exoskeleton instead of a brand-new one.


Fiddler Crab Container & & Water Demands

Fiddler crab habitat and tank requirements

The fiddler crab storage tank ought to duplicate the crab’s wild environment as very closely as feasible, with briny water, as well as accessibility to undersea as well as above-ground environments.

The crabs ought to be housed in a container that holds a minimum of 10 gallons of water.

Environment as well as Container Demands

In the wild, fiddler crabs reside on the shoreline. Complying with the all-natural motion of the trend, the crabs invest a few of their time on rough, sandy coasts, as well as a few of their time undersea. The water in this environment is briny, cozy, a little alkaline, as well as oxygenated.


Duplicate this atmosphere as very closely as feasible to guarantee your fiddler crabs are worked out in the storage tank.

To establish a fiddler crab storage tank, comply with these actions:

  1. Include a layer of soft, sandy substratum to the base of the storage tank, which the crabs can filter via to delve as well as feed. The sand must go to the very least 3 inches deep on one side of the storage tank, as well as must incline as much as supply an above-water location beyond of the storage tank.
  2. Location huge rocks, driftwood, as well as gives in the storage tank, offering sanctuary, relaxing areas, as well as concealing locations for the crabs. Do not include real-time plants due to the fact that the crabs will likely ruin these.
  3. Fill up one-fifth of the storage tank with low-salinity briny water, making certain there suffices above-water room for the crabs to rest.
  4. Set up a hot water heater to keep a cozy temperature level, as well as utilize an air pump to maintain the storage tank oxygenated.

Water Problems

The perfect storage tank problems for fiddler crabs are:

Water kind: Briny, a little alkaline, low-salinity
Storage tank dimension: Minimum 10 gallons for one to 4 crabs, as well as an added 3– 5 gallons per added crab
Water temperature level: 75– 86 °F
Substratum: Soft sand
Storage tank arrangement: Rocks, driftwood, caverns
Level Of Acidity: 8.0– 8.3 pH
Water firmness: 8– 25 dGH
Filter: Yes, to maintain the water tidy as well as oxygenated
Bubbler: Yes, to oxygenate the storage tank
Illumination: Yes, supply lights for around 12 hrs daily to stand for all-natural daytime as well as nighttime
Hot water heater: Yes, to maintain the water cozy

Briny water with a reduced salinity is crucial in a fiddler crab storage tank. The crabs can not make it through in completely freshwater or deep sea atmospheres, so the storage tank water ought to have a salinity of in between 1.01 as well as 1.08 particular gravity.


You can accomplish this salinity by including determined quantities of top quality aquatic salt to freshwater.

Treatment & & Diet Plan

Fiddler crab care and diet

Looking after fiddler crabs is simple as long as you maintain the storage tank tidy. Feed the crabs an omnivorous diet plan of plants as well as abundant healthy protein resources, as well as keep an eye out for usual illness, like covering illness.

Diet Plan as well as Feeding

In the wild, fiddler crabs filter via the substratum to locate algae, fungi, as well as germs. Supply a selection of foods in bondage to guarantee the fiddler crabs obtain a nourishing diet plan.

Excellent foods to feed fiddler crabs are:

  • Sinking foods like shrimp pellets
  • Icy plankton
  • Icy salt water shrimp or bloodworms
  • Algae
  • Lettuce
  • Zucchini

Feed fiddler crabs a pinch of food two times daily, offering a mix of nourishing plant-based as well as protein-based foods to stop wellness concerns as well as weight problems.

They are understood to consume components of their old exoskeletons after molting. These supply a great resource of calcium, so you ought to leave them in the storage tank for a week after the crabs have actually molted.

General Treatment

Looking after fiddler crabs is simple due to the fact that they’re durable as well as can heal themselves of several illness by molting. To maintain these crabs healthy and balanced, feed them a nourishing diet plan, utilize a great water filter, as well as transform 20% of the water as soon as every 3 weeks.

As highly-social pets, fiddler crabs ought to be maintained in teams of a minimum of 2. They do not require supplements as long as their food gives a full resource of nutrients.

Typical Issues

Fiddler crabs aren’t normally vulnerable to illness in bondage.


Poor living problems raise the danger of microbial as well as fungal illness, which harm the crab’s covering as well as at some point result in shell illness– the dynamic destruction of the exoskeleton. Stop covering illness by maintaining the storage tank water tidy as well as transforming the water on a regular basis.

Fiddler crabs are specifically prone after molting due to the fact that their brand-new exoskeletons are soft as well as fragile. To stop damages to the covering, prevent troubling the crab as well as permit the crab to remain separated till it comes to be energetic once more.

Is a Fiddler Crab Dangerous?

Fiddler crabs aren’t harmful to take care of, however they are fragile. The crabs choose not to be touched as well as are understood to squeeze individuals when they really feel intimidated, so do not buy a fiddler crab if you desire a family pet that you can take care of.

Container Companions

Fiddler crab tank mates

Due to their particular water needs as well as their requirement for a sloping substratum, fiddler crabs are normally housed alone, or in teams of their very own kind. Very few fish can make it through in the low-salinity water that fiddler crabs require, as well as the crabs are understood to assault fish with their claws.


Feasible storage tank companions for fiddler crabs are:

If you intend to include fish to your fiddler crab storage tank, ensure there’s a lot of water for the fish to swim in.

Non-fish storage tank companions for fiddler crabs are:


Reproducing fiddler crabs in bondage isn’t feasible due to the fact that the fiddler crab’s larvae require to be lugged in the sea’s water column throughout their growth. This can not be recreated in bondage, so the larvae are incapable to establish correctly in a fish tank.

Fiddler crabs still try to generate in bondage, as well as the men court the women by developing sand hoods as well as swing their huge claws. Sometimes, the lady will certainly lay eggs, however the larvae will not establish.


Should You Obtain a Fiddler Crab for Your Fish tank?

Fiddler crabs are durable, unique-looking crabs that are simple to care for. You ought to purchase fiddler crabs if you intend to establish a specialized storage tank with the ideal water problems for this varieties.

Do not buy fiddler crabs if you intend to include the crabs to a pre-existing storage tank that does not fit their needs. If you intend to house fiddler crabs as well as fish with each other, ensure there’s a lot of area for the varieties to cohabitate.

In spite of their conflict with the majority of fish as well as their particular needs for briny water, fiddler crabs are amusing animals that are perfect for individuals trying to find a modification from fishkeeping.

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