Seahorse Foods and Feeding

By Tamara  Weiss
Aquarticles

Seahorses are ambush predators, feeding primarily on crustaceans, mostly shrimp. In their wild state, most seahorses only eat live food. (Although H. capensis is an exception and known to feed on dead food in the wild). In our aquariums, Wild Caught specimens often don't recognize many food items offer that are not from their natural environment. This includes dead food, which they just don't see as food unless trained to make the switch.

Captive reared seahorse, on the other hand, are almost always willing to accept frozen. It seems as though being in captivity makes them more willing to try new foods. Even those captive reared seahorses not previously fed frozen make the switch almost immediately in most cases.

It is ideal to offer seahorses a variety of foods - in the wild, they would not eat only one food source, so in captivity they shouldn't be expected to. Varying their diet allows for a more complete nutritional profile, as well as providing mental stimulation which they often lack by only feeding one food type.

When feeding, whether live or frozen foods, its best to offer food that originated from a marine environment. Marine animals are rich in Highly Unsaturated Fatty Acids (HUFAs) that freshwater organisms lack or have in the wrong concentrations. The HUFAs are produced by phytoplankton, base of the marine food chain so all marine organisms are dependant on them in some way. Freshwater animals fed can be fed to marine animals, but they need to be enriched with different products containing the necessary fatty acids, such as Selco, or Ocean Rider Vibrance.

The exception to this rule is Brine shrimp, while they are technical marine, coming from a saline environment, their ecosystem is much different than the ocean, and therefore do not have the HUFA's of other marine animals.

Live Food
Some believe that live foods are the best foods available for seahorses. It was only a few years ago that the only foods ever offered to seahorses was live food. The availability of captive bred seahorses and new techniques for training seahorses has changed that, although much live food is still offered as occasional treats or for Wild seahorses that can't be trained on frozen food. While there are many types available to the hobbyist, it can be difficult to obtain from local fish stores. Culturing live food in quantities large enough to feed seahorses provide a significant challenge to seahorse keepers. Most cultures require large amount of space and are labor intensive. Others breed to slow if at all. For most hobbyists, live food has to be purchased over the internet, or if they're lucky enough to have this option, collected from local waters.

*IMPORTANT NOTE* Some wild caught seahorses refuse to be trained on to frozen foods. Others learn, but stop for no apparent reason. Anyone attempting to keep wild caught seahorses should plan to dedicate themselves to continuously providing live food should such circumstances arise. There are cases were no amount of diligence or experience will result in wild seahorses eating frozen foods. For that reason, if you are not prepared to offer live foods for the natural life span of your seahorse, which could be up to 7 years, I strongly suggest you do not consider keeping wild caught seahorses.

	Brine shrimp, Artemia Sp. The most common food offered to seahorses and also probably the worst. Many fish stores recommend feeding this because as a live food, a lot of seahorses will react to it and eat it. However, there is virtually no nutritional value to them, and because seahorses have a short digestive tract, they can not even make use of the little bit nutrients there. Seahorses fed only this will slowly die of starvation, sometimes over a period of months. There is some value to enriching them, although not enough to be a staple of the diet. They are often refused as well because they do not behave like "normal" shrimp which are part of a seahorse's natural diet. Their swimming habits often confuse seahorses, leaving them often to entirely ignore the brine shrimp.
	Baby Brine Shrimp, Artemia sp. Unlike Adult Brine shrimp there is SOME nutritional value to newly hatched baby brine shrimp. They have a nutritious yolk reserve to allow them to hatch out and survive the first twelve hours until they develop a complete mouth and anus. It is when they first hatch that they are still at their most nutritious and should be fed. Decapsulating the cyst before hatching (removing the shells) is recommended so it takes less energy for the brine nauplii to hatch, and are therefore more nutritious because they've used less of their food store. Brine shrimp can also be enriched for 24 hours before feeding. Baby brine shrimp is the normal staple for dwarf seahorses, and is often used to feed seahorse fry.	Day old brine shrimp next to a penny.
	Rotifers Saltwater rotifers are microscopic organisms feed to seahorse fry that are too small to take brine shrimp at birth, and for supplementing the diet of adult dwarf seahorse. They are easy to culture using phytoplankton, yeast, special rotifer food, and even v8! There are a few different species and strains available in aquaculture, and choosing larger ones is usually better for seahorse fry.	Three rotifers next to a penny for size comparison. That is the "T" from "IN GOD WE TRUST".
	Copepods Tiny crustaceans, most roughly the size of new born brine shrimp. They are the best food for seahorse fry and dwarfs, but are not easy to culture and depending on their swimming habits, may not be noticed by some fry. There are three kinds of copepods generally used for feeding seahorses, harpactacoid, cyclopoid and calanoid. Harpactacoid are the easiest to culture, but they prefer living on the surface of objects, and thus do not always attract the attention of seahorses.They can be gathered from aquariums at night when they are most commonly found on the sides of the aquarium. Culturing just requires a container with an airline set on low, and crushed flake food. Calanoids swim in the water column which makes them ideal for seahorse fry and dwarves. However they are not easily cultured. Most used for seahorse food are caught directly from the ocean. Cyclopoids (cyclops) are found in refugiums occasionally and fed out. They are predatory, so culturing is probably not an option.
	Red Shrimp, Opa'e ula, Halocaridina rubra Small brackish water shrimp endemic to Hawaii. They are an excellent seahorse food and very few seahorses will refuse them. They are, however, not easy to obtain and must be purchased through mail order sources. They also have a slow reproduction rate, producing a few young only a couple times a year, making culturing at home impractical.
Mysis relicta photo courtesy of PE Mysis	Mysis shrimp, Opossum shrimp, Mysis sp., Mysidopsis sp. and similar Another great seahorse food, readily accepted. Mysis "shrimp" aren't actually shrimp, but a very shrimp like crustacean. They probably make up a large portion of the diet of wild seahorses. They reproduce at an alarming rate, producing young every 1 - 2 weeks, and are sexually mature at around 15 days.The young are born alive, and new born mysis make excellent food for juvenile seahorses that are starting to outgrow bbs. They however require a lot of time and energy culturing as the young need to be separated from the adults to prevent cannibalism. They also require feedings of newly hatched artemia nauplii or similar twice a day. Mysis can also sometimes be found it reef tanks among live rock and in refugiums. Sometimes you can convince your LFS to collect them from their live rock tanks, especially if you're in a panic and ask REALLY nicely. Most LFS's will do it, afraid of upsetting the crazy seahorse lady again.
	Ghost shrimp, Grass shrimp, Glass Shrimp, River shrimp These are clear shrimp commonly found along the shore lines and in rivers and streams. They make good seahorse food for large species such as H. erectus or H. reidi. The freshwater variety is often available through local sources, such as fish stores and bait shops. Culturing is time consuming, and either requires a large outdoor container such as a kiddy pool or separation of the young. Freshwater ghost shrimp should be enriched.
	Amphipods, Gammarus, Scuds Often described as "little bugs", these segmented crustaceans are usually present in our tanks, even under aggressive predation. Most seahorses will poke around rocks for a quick snack when these guys come out. If they can't live in the tank, they will often live in the filter pads. For the occasional treat, you can easily create a in the tank refugium which will allow them to hide and breed. Make a small box out of plastic screen or egg crate, and fill with algae, lightly packed filter floss, or shredded plastic. They can also be harvested from most bodies of water, fresh and marine. They prefer to hide under and around algae covered rocks.
	Isopods Similar to amphipods, these relatives of the common pill bug also make good seahorse food. Just watch out for parasitic Isopods (they will usually have very large eyes). I have found that tanks with isopods rarely have amphipods and tanks with amphipods rarely have isopods. I do not know if they out compete each other or if this is just an anomaly I observed in my tanks.
	Cleaner Shrimp Larvae Peppermint, skunk cleaners, and Fire shrimp (less so) all produce small larval shrimp at regular intervals when at least two are kept together. Because they are hermaphrodites, there is no need to sex them, just put a pair in the tank. Most adult seahorses will ignore the larval shrimp, but juvenile and dwarf seahorses love them. They are usually born at night, but are positively phototrophic so can be collected by setting up a light in/near a container to trap them. Raising them is difficult, but having enough broodstock around can leave you with an endless supply of shrimp larvae.
	Daphnia A freshwater relative of copepods, sometimes offered to juvenile seahorses and there are reports of some finicky adult seahorses taking them. Usually these are narrow snouted species such as H. comes or H. barbouri.
	Livebearer Fry Mollys, guppys, etc . . . Some seahorses will eat livebearer fry, while others ignore them completely. They are easy to have around though, so many keepers have them "just in case"
	Larval Food Shrimp These are the young of food shrimp that people eat. They can be obtained in a variety of sizes depending on their stage of development. Because of their use for human consumption, they're also pathogen free. Most food shrimp dealers will not accommodate small orders that seahorse keepers would be looking to make. Noni (George) however, has been a god send, more than willing to help seahorses.

Frozen Foods
Most captive bred seahorses readily accept the appropriate frozen foods. Some wild caught seahorses can be trained as well to eat frozen. Below are some of the frozen foods that can be fed to seahorses.