Aquarium Shrimps Part 3 - Shrimp Care
Drs. Foster & Smith Educational Staff
By Scott W. Michael
Most of the shrimps available to aquarists are relatively easy to keep if they are
placed in the right captive venue. They should be provided with suitable shelter, but
the type of shelter depends on the species in question. For example, most of the
reef-dwelling forms simply need crevices or overhangs to lurk in or under. In contrast,
most of the snapping shrimps encountered in the trade, prefer a sand bottom so that
they can dig burrows. You can facilitate burrow construction by adding pieces of
rubble or by placing flat rocks on the sand surface that act as a ceiling for their
subterranean homes.
As indicated in our examination of the families encountered in the trade, there
are certain shrimps that live commensally with specific invertebrate hosts. For
example, there is a relatively large guild of shrimps that lives among the
tentacles of sea anemones. While many of these anemone-dwellers may
survive in an aquarium without a cnidarian, they are definitely more
vulnerable to predators when not housed with their stinging host. Without
their hosts, many of these species will hide incessantly and often perish
prematurely. For example, I have had wholesalers send me the White-stripe
Urchin Shrimp ( Stegopontonia commensalis). This shrimp is like "a fish out
of water" if it is not kept with sea urchins. It will hide among the rocks and
typically will die soon after being placed in a tank that lacks an echinoderm
host. The same can be said of the Emperor Shrimp (Periclimenes imperator),
which is normally found riding on holothurians and sea slugs. It is dependent,
at least in part, on the fecal material of its host, as well as other forms of detritus. When these animals are kept without their
invert partner, they skulk about in reef recesses and are rarely seen or appreciated by the aquarist. To ensure that you provide
your shrimp with the proper host, it is important to investigate the natural history of the animal that you are considering for
your home aquarium before purchasing it. If you cannot provide these commensal forms with a suitable host, do not buy
them.
Aquarium size is less of a factor for shrimps than it is for fishes. Most of the shrimps can be kept in tanks as small as 2 to 5
gallons. The majority of species available in the aquarium trade are quite small and do not need a large home range in which to
roam. For example, many of the cleaner shrimps stay within the same crevice or cave for most of their lives. Some species
are best displayed in smaller tanks. For example, a pair of Harlequin Shrimp in a 5 to 10 gallon tank makes a fantastic exhibit.
If you place some of the smaller shrimps in a large reef aquarium, you may never see them again. They may hide constantly
in the many caves and crevices present, or they may end-up being food for some cryptic predator (e.g., larger snapping
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shrimp, mantis shrimp) that came in with the live rock.
Feeding
Most of the shrimps will feed on any food that they can grab with their feeding
appendages. This includes frozen preparations, brine shrimp, mysid shrimp, flake
foods and tablet or pelletized foods. In the past, I have rarely target fed my
shrimp. Instead, when I feed the fishes in the aquarium, I watch to make sure that
some food makes it to the substrate where the shrimp hang-out. This may mean
turning off the water pumps for a brief period so that food comes to rest on the
aquarium bottom (don't forget to turn them back on after the shrimp get
something to eat). If you are having difficulty getting food past your fish, you
can use a turkey baster to squirt the food into caves and crevices occupied by
your shrimp. The cleaner shrimps will supplement their diets with the slime,
scales and possibly the parasites found on fishes in the aquarium. However, unlike
many of the cleaner wrasses, these shrimps can live without this supplementary
source of food (i.e., they can be kept in a tank without fishes).
When it comes to feeding, the highly specialized Harlequin Shrimps
(Hymenocera spp.) are a notable exception to the rule. These shrimps only feed
on sea stars and will need a ready supply of these echinoderms if they are going
to survive in the aquarium. A medium-sized sea star should last a pair of
Harlequin Shrimp about one week. Make sure you remove the uneaten portions of
the sea star so that it does not pollute the aquarium. Many of the Bumblebee Shrimps (Gnathophyllum spp.) also have
specialized diets. While echinoderm tube feet may be eaten in the wild, at least some of these shrimps will accept frozen food
in captivity.
Shrimp Maladies
The shrimps are apparently not susceptible to many parasites or
diseases. (However, it may be that we simply do not know enough
about these animals to recognize when a shrimp perishes as a result of
illness.) There are isopods that live in the gill chamber of certain
shrimps. The most common of these appears as a swelling on the side
of the carapace. Although it less commonly infects shrimps, fish lice
(cymathoid isopods) have also been seen attached to shrimps. It is
highly unlikely that these parasites actually kill their host, but they
may weaken them.
Most of the shrimps available to hobbyists need relatively clean,
well-oxygenated water. Shrimps tend to perish more readily during
shipping if a shipment is delayed than other invertebrates or fishes because of oxygen deprivation. For example, the anemone
shrimps in the family Palaemonidae are very sensitive to drops in oxygen levels and, as a result, often ship poorly. The
aquarist should work quickly to acclimate these animals to holding aquariums so that they can be removed from shipping
bags. Note that acclimation is very important for many shrimp species. If you expose them to drastic changes in temperature,
oxygen levels, pH, or other water parameters, it is possible to shock them to death. "Drip acclimate" your shrimp for
approximately one hour.
The exoskeleton of crustaceans is composed of chitin. In order to grow,
crustaceans must periodically shed their exoskeleton. This process is known
as molting. Before the old skeleton is shed, a new one is laid down beneath it.
The old one splits open and the animal works its way out of the "shell."
Calcium salts are extracted from the seawater and infused into the
exoskeleton, which hardens the crustacean's armor. However, this takes time,
so just after molting a crustacean is very vulnerable. As a result, they often
spend more time hiding during this soft shell phase.
Unfortunately for crustaceans, there are predators that can smell chemicals
produced during the molting process. Crabs and fishes will make short work
of shrimps that have recently molted. (I once saw a large polychaete worm
attack and swallow the chelae of a molting crab!) Not only is a molting shrimp
more vulnerable to predators, it is also more vulnerable to attack from
conspecific competitors. For example, boxer shrimps have been known to
subdue conspecifics during or just after molting.
Occasionally, a shrimp will die during molting because of the increase in
energy expenditure and oxygen deprivation. This can happen if the shrimp has
a difficult time getting out of its old armor. If a shrimp is having a difficult time shedding the old exoskeleton from one of its
appendages, it may lose the problem leg, claw or antennae. However, when it molts again, it will regenerate the missing
limb.
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Compatible Fish Tankmates
One of the most common causes of shrimp death are incompatible
tankmates. Crustaceans are fed upon by many reef fishes and shrimps
are some of the most delicate and vulnerable of all the crustaceans.
Where a box crab or mantis shrimp may be able to thwart the attacks
of predators with their large and/or modified forelimbs or heavy
carapaces, most decapod shrimps are not as well equipped to ward off
their piscine enemies.
Some shrimps are more susceptible to attack than others. For example,
the boxer shrimps (Stenopus spp.) are larger in general and have more
formidable pincers than the anemone shrimps (Periclimenes spp.).
Many of the species in the latter group are small, delicate shrimps that
associate with other animals as a form of self-defense. Therefore, if
you add a boxer shrimp to a tank that contains a large shrimp goby, it
is not likely to bother it. However, if you add a small anemone shrimp
to this same tank, the goby may eat it.
When considering the potential danger they present to shrimps, fishes can be broken down into three major groups: those
species that rarely if ever bother shrimps, those species that are potentially dangerous to shrimps, and those species that are
always a threat to shrimp tankmates.
The members of the rarely if ever bother shrimps group are obviously the species that make the best decapod companions.
This group includes the anthias, small cardinalfishes, angelfishes, butterflyfishes, most damselfishes, flasher wrasses, small
fairy wrasses, tube blennies, combtooth blennies, dragonets, smaller gobies, dartfishes, surgeonfishes and rabbitfishes. These
fishes can be classified as herbivores, sessile invertebrate feeders and microcarnivores.
The potentially dangerous to shrimps group is a mixed bag. These fishes tend to be more of a threat to smaller, more
delicate shrimp species. Larger dottybacks, especially members of the genera Ogilbyina and Labracinus are dangerous to
shrimps, while the smaller members of the pseudochromoid clan are usually not a threat to ornamental crustaceans. This
applies to cardinalfishes as well. Larger apogonids are a threat to shrimps they can swallow whole, while the more diminutive
cardinalfishes are usually good shrimp tankmates. Although many of the gobies are ideal shrimp tankmates, some of the larger
species (e.g., Cryptocentrus) will ingest smaller shrimps. With members of this second group, adding the shrimp to the
aquarium and letting it fully acclimate before you add the questionable fish species will help increase the shrimp's chances of
survival. A stressed, flighty shrimp that has been dropped into a tank full of fish is a more attractive target than one that was
there to begin with.
The fishes that are always a threat to shrimp include: the sharks, rays, morays, snake eels, coral catfishes, lizardfishes,
toadfishes, frogfishes, squirrelfishes, scorpionfishes, waspfishes, groupers, comets, tilefishes, hawkfishes, snappers,
goatfishes, larger wrasses, large jawfishes, sand perches, triggerfishes, puffers and porcupinefishes. The only species of
shrimps that may survive in a tank with these fishes are the cleaner species. For example, if a cleaner shrimp species is
introduced to an aquarium before a moray is added, the moray may "tolerate" the shrimp and not eat it. (I should point out,
that keeping a cleaner shrimp with a moray makes for an amazing and educational display!)
Compatible Invertebrate Tankmates
Shrimps are not only vulnerable to being eaten by fishes, there are also a
number of invertebrates that are a threat. Probably the most dangerous
invertebrates are other crustaceans, especially crabs. Many crabs are
omnivorous and opportunistic. If they can catch a shrimp, they will eat it.
They use their powerful pincers to dismember their less heavily armored
cousins. The only crabs I would trust with a prized shrimp are Porcelain
Crabs (e.g., Anemone Crabs) and smaller hermit crabs. The voracious
mantis shrimps are deadly to shrimp populations. They use their modified
raptorial appendages to disable other shrimps.
Sea anemones are also potential shrimp predators. While there are some
that can live among the stinging tentacles of these cnidarians, others will
be stung and eaten. The Carpet Sea Anemones ( Stichodactyla spp.) are the
most dangerous. I have had cleaner (Lysmata spp.) and Marbled Shrimps
(Saron spp.) dart about the aquarium and run into these toxic anemones
when they were released into the tank. They were subdued and
subsequently eaten. On one occasion, I had a large Clark's Anemonefish
( Amphiprion clarkii) grab a marbled shrimp in its mouth and stuff it into
its host carpet anemone! Some of the larger corallimorpharians, a close
relative of the sea anemones, might also prey on shrimps. This includes the
Elephant Ear Mushroom Anemone ( Amplexidiscus fenestrafer) and some of the Rhodactis spp.
Many of the shrimps can be kept in pairs or in groups, while others are less tolerant of conspecifics, especially members of
their own sex. For example, the Camel Shrimp is usually seen in large aggregations in the wild and can be housed in groups in
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the aquarium. Likewise, the Skunk Cleaner Shrimp (Lysmata amboinensis) is found in groups and will tolerate each other in
the confines of the aquarium. But the related Blood Red Shrimp (Lysmata debelius) is more aggressive toward conspecifics
and is best kept singly, or (a male-female pair can be housed together). The boxer shrimps (Stenopus spp.) can also be very
aggressive toward members of their own kind. So, while these shrimps can be housed in male-female pairs (which are often
available from LiveAquaria.com), they should not be kept with consexuals. Heterospecific Stenopus spp. are also likely to
quarrel and may attack and kill smaller shrimps in smaller aquariums. Male Marbled (Saron spp.) and possible some of the
larger hingebeak shrimps (Rhynchocinetes spp.) will spar, especially in tight confines. Fortunately, members of both of the
latter genera are sexually dimorphic, with the males processing elongated chelae. Keep only one male of these species in the
same tank, unless it is very large so that males may be able to avoid each other.
Shrimps in the Reef Aquarium
There are many shrimps that are welcome additions to the reef aquarium.
Some of the best reef tank shrimps are members of the genus Lysmata,
Periclimenes and Stenopus. There are some shrimps that can even be put to
work in the reef aquarium. For example, the Atlantic Peppermint Shrimp
(Lysmata wurdemanni) will graze on sea anemones in the genus Aiptasia.
Populations of these anemones often grow out of control in the reef tank and
will sting and damage the soft tissues of other sessile invertebrates. The
snapping shrimp, as indicated above, can also be useful in helping stir sand
substrate.
While some of the shrimps are wonderful reef tank inhabitants, others are best
avoided. There are some species that will feed on corals and their relatives.
The hingebeak shrimps will feed on mushroom anemones, zoanthids, leather
corals, and possibly other soft coral species, while the members of the genus
Saron have also been reported to graze on soft and stony coral polyps, mushroom anemones, zoanthids and tridacnid clams.
In conclusion, while the shrimps will not fit into every aquarium community, there are many species that are well-suited for
either the fish or reef aquarium. Just remember to select their tankmates carefully and pick shrimps that will fit into your
particular aquarium environment. Happy shrimp-keeping!
Part 1
Part 2
Part 3
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An Introduction Shrimps in the Aquarium Trade Shrimp Care
Scott Michael
Scott W. Michael is an internationally-recognized writer, underwater photographer, and
marine biology researcher specializing in reef fishes, and was the Banquet Speaker at our
2007 and 2008 Coral Conference and Frag Swap. He is a regular contributor to Aquarium
Fish Magazine, Freshwater and Marine Aquarium Magazine, SeaScope, and is the author of
Reef Fishes Vol 1, Vol 2, Vol 3, Vol 4, and Vol 5., A Pocket Expert Guide Marine Fishes, A
Pocket Expert Guide to Reef Aquarium Fishes, 101 Best Saltwater Fishes: How to Choose
and Keep Hardy, Brilliant, Fascinating Species That Will Thrive in Your Home Aquarium,
Reef Sharks & Rays of the World, and Aquarium Sharks & Rays. Having studied marine
biology at the University of Nebraska, Scott has served as a scientific consultant for National Geographic Explorer, the
Discovery Channel, and French educational television.
Resources
Debelius, H. 199. Crustacea Guide of the World. IKAN, Frankfurt, Germany, 321 Pp.
Fossa, S. A. and A. J. Nilsen. 2000. The Modern Reef Aquarium. Volume 3. Birgit Schmettkamp Verlag, Bornheim,
Germany, 448 Pp.
Hoover, J. P. Hawaii's Sea Creatures. Mutual Publishing, Honolulu, Hawaii, 366 Pp.
Aquarium Shrimps Part 3 - Shrimp Care - Page 4 of 4
Unauthorized use of any images, thumbnails, illustrations, descriptions, article content, or registered trademarks of Foster & Smith, Inc. is strictly
prohibited under copyright law. Site content, including photography, descriptions, pricing, promotions, and availability are subject to change without
notice. These restrictions are necessary in order to protect not only our copyrighted intellectual property, but also the health of pets, since articles or
images that are altered or edited after download could result in misinformation that may harm companion animals, aquatic life, or native species.