Ocean Rider Seahorse Farm and Tours | Kona Hawaii › Forums › Seahorse Life and Care › Seahorse can’t suck food
- This topic has 3 replies, 2 voices, and was last updated 13 years, 2 months ago by Pete Giwojna.
March 7, 2010 at 10:19 pm #1794Judy58Member
Hi – not been here for a while but need your help again please if possible – I have a female Kuda who is approx 18 months old and she seems to have lost the ability to suck food – there just isn’t any ‘power’ there – I have given her a FW and anti-bacterial dips, checked calcium levels etc etc but still no joy – about 6 months ago I had a reidi female do just the same – even after several dips in various medications etc she totally lost her suck and died in the end – I don’t want this one to go the same way if I can help her – any ideas PLEASE – also have you any idea why this has happened again or is it just one of those things – all the other 6 ponies are fine and eating like mad as she did until about 2 weeks ago – she even has difficulty sucking even the smallest bits of food up though she does get the odd bit but not enough to live on forever – she gets them to the end of her snout and then just hasn’t got the suck she needs to get it in – half the time even the younger kudas pinch it from her snout so she is hardly getting enough to survive for long !!! PLEASE CAN YOU HELP – I await your reply – many thanks JudyMarch 8, 2010 at 1:54 am #5072Pete GiwojnaGuest
I’m sorry to hear about the problem your female Hippocampus kuda seahorse has developed, but I think I may be able to help you salvage the situation.
The loss of suction during feeding that you describe is commonly known as "weak snick," and it can become a serious problem if it progresses to the point that the seahorse can no longer slurp up enough food keep it going.
Weak snick and related feeding disorders are usually due to either a mechanical injury or an infection affecting the seahorse’s hyoid bone trigger mechanism or the underlying musculature with which it generates the powerful suction that it uses when feeding. Such mechanical injuries can sometimes be caused by ingesting a foreign object while feeding, or the problem may be due to protozoan parasites that attack the gills and eventually affect the muscles that operate the buccal suction pump and/or the opercular suction pumps, or as a result of secondary infections associated with such protozoans. Here is a discussion of weak snick excerpted from my new book (Complete Guide to the Greater Seahorses in the Aquarium, unpublished), which will explain more about this disorder and how it can be treated:
FEEDING DIFFICULTIES: WEAK SNICK, TRIGGER LOCK, & LOCK JAW
Seahorses suck! That’s a fact. Our amazing aquatic equines are supremely well adapted for suctorial feeding, which just means that their tubular snouts are designed for generating a powerful suction and slurping up small prey whole (Giwojna, Feb. 2004). Basically, their tubular mouths operate like slurp guns, a method of feeding that is often adopted by fish accustomed to taking prey from the bottom or plucking small crustaceans and larvae from the leaves of underwater plants (Evans, 1998). The anatomy of the seahorse’s head has evolved to accommodate this method of feeding (Giwojna, Feb. 2004).
For example, a tubular mouth is an advantage for suctorial feeding because it acts like a pipette and the narrow opening accelerates the inrush of water via the Venturi effect, thus maximizing the suction generated by the powerful head muscles (Giwojna, Feb. 2004). The seahorse’s oral or buccal cavity and gill chambers (opercular cavities) act as dual suction pumps that draw the water inwards with considerable force (Evans, 1998). Expansion of the buccal and opercular cavities causes a sudden drop in pressure within the mouth (Evans, 1998). The suction thus created allows the seahorse to suck up food through its slurp-gun snout faster than the eye can follow. In essence, the seahorse inhales its food in the blink of an eye, and cavitation caused by the sudden inrush of water traveling at tremendous velocity through the narrow snout and characteristic movements of its head and skull bones produce the distinctly audible "snick!" which announces the demise of its prey (Giwojna, Feb. 2004).
Every seahorse keeper is familiar with the seahorse’s "trigger," located at the underside of its jaws at the base of its throat, which moves downward sharply when the seahorse strikes, thereby expanding its oral (buccal) cavity and generating the suction to draw its prey inwards. This trigger is actually the seahorse’s hyoid bone, and it is pulled downward by contraction of the powerful sternohyoideus muscle that runs from the hyoid bone to the cleithrum (one of the bones of the pectoral girdle), which forms part of the seahorse’s bony exoskeleton (the cleithral ring) just behind its head (Evans, 1998).
The suction generated by the sudden downward contraction of the hyoid bone when a feeding seahorse "pulls the trigger" on its intended prey is greatly enhanced by the nearly simultaneous expansion of its gill chambers or opercular cavities (Giwojna, Feb. 2004). The additional suction thus created by the seahorse’s opercular pump is produced by contractions of the hyohyoideus muscles and dilator operculi muscles (Evans, 1998). The water pulled into the gill chambers this way is then expelled from the opercular cavity through a small pore. (This narrow opening accelerates the stream of water passing through it in the same way as its narrow tubular snout does.) The seahorse’s bony coronet evolved atop its head in part to provide solid anchorage and attachment points for the large muscles that operate its buccal suction pump and twin opercular suction pumps, which enable it to feed so efficiently (Giwojna, Feb. 2004). This is the perfect feeding mechanism for an ambush predator, ideal for extracting small prey items from heavy cover or sucking up suspended prey neatly from the water column, and the seahorse is perfectly adapted for its role as the sniper of the seagrass jungle (Giwojna, Feb. 2004).
Of course the seahorse’s turreted, independently operating eyes are the perfect targeting system for this sophisticated feeding apparatus (Giwojna, Feb. 2004). Side-mounted, hemispherical eye turrets provide nearly 360 degrees of vision and allow the seahorse to look upwards and downwards (or forward and backwards) simultaneously in search of potential prey or possible predators (Giwojna, Feb. 2004). As soon as it detects a likely prey item, both eyes lock on it simultaneously and track it intently, thus providing excellent depth perception. This allows the seahorse to judge distances with remarkable accuracy as it draws a bead on its intended victim (Giwojna, Feb. 2004).
The hyoid bone is the trigger which fires the seahorse’s slurp-gun snout, and the moment its prey closes within striking distance, the powerful sternohyoideus muscle contracts and pull the trigger (Giwojna, Feb. 2004). The buccal cavity expands, followed the almost instantaneous contraction of the hyohyoideus muscles and dilator operculi muscles, which likewise expand the opercular cavities (Evans, 1998). The resulting drop in pressure creates a sharp inrush of water, which draws the prey irresistibly into the seahorse’s mouth (Evans, 1998). Once the prey has been sucked in, the mouth is closed. At this point, the buccal and opercular cavities are contracted and the excess water is forced out in a strong stream via the tiny opercular pores (Evans, 1998).
All this happens in an instant, faster than the eye can follow, and the powerful suction that is generated often macerates large prey (Giwojna, Feb. 2004). When the resulting debris is expelled from the gill chambers, it looks remarkably as if the seahorse is shooting smoke out of its ears, thus giving a feeding seahorse an uncanny resemblance to the legendary fire-breathing dragon (Giwojna, Feb. 2004).
However, when this remarkable feeding mechanism is injured or disrupted by parasites and/or secondary infections, a number of problems arise. Weak snick is an unusual affliction that results when a seahorse is unable to generate adequate suction to feed properly. Seahorses develop weak snick when their sophisticated feeding apparatus, or the muscles that operate it, are incapacitated as a result of injury or infection.
For example, I have often seen it in seahorses as a result of protozoan parasite infections (Amyloodinium, Cryptocaryon, Brooklynella, Uronema, etc.). I tend to suspect that’s the cause when the weak snick is accompanied by rapid respiration and labored breathing, or when more that one seahorse develops the condition, or when the weak snick victim’s tankmates are bothered by odd ailments such as "trigger lock," appetite loss, lockjaw, heavy breathing, or the first signs of snout rot, which all early indications of masked protozoan parasite infections (Giwojna, Dec. 2003). These organisms typically attack the gills first, from which they spread to the throat and mouth (oral or buccal cavity). As their numbers build up in the gills and they spread from within, invading the esophagus and oral cavity, symptoms such as rapid breathing, loss of appetite, weak snick, trigger lock, and snout rot begin to appear (Giwojna, Dec. 2003).
This is how I believe the disease progresses in such cases: the burrowing of the embedded parasites causes hyperplasia of the underlying tissue, and when sufficient numbers of them build up in the gills, we see the initial symptoms of respiratory distress, labored breathing, and huffing (Giwojna, Dec. 2003). During a heavy infestation, the parasites may attack the key muscles that expand the opercular cavity, or sheer numbers of the parasites can clog the gills to the extent that the opercular pump is impaired, resulting in weak snick due to a decrease in suction (Giwojna, Dec. 2003). In severe cases, this will eventually result in death by asphyxiation.
In less severe cases, the parasites will continue to spread from the gills into the throat, buccal cavity, and eventually the snout itself (Giwojna, Dec. 2003). When this happens, the irritation caused by the burrowing parasites and the hyperplasia of the infected tissue can cause loss of appetite or difficulty swallowing and the victim may go on a hunger strike (Giwojna, Dec. 2003). If the swelling and hyperplasia occlude the gills, throat and snout sufficiently to prevent the seahorse from generating adequate suction when attempting to feed, weak snick is the result (Giwojna, Dec. 2003). If the burrowing of the embedded parasites allows secondary fungal or bacterial infections to take hold, the seahorse can develop snout rot (Giwojna, Dec. 2003). When such secondary infection(s) affect the sternohyoideus muscle that controls the hyoid bone trigger mechanism, ailments such trigger lock, sticky trigger, or lockjaw result and again the seahorse is unable to feed (Giwojna, Dec. 2003). Weak snick can be caused in this way as well if the sternohyoideus muscle is affected to the extent that hyoid trigger still operates, but so feebly that the buccal pump can no longer generate sufficient suction to feed (Giwojna, Dec. 2003).
Another common cause of weak snick in many instances is a mechanical injury to the seahorse’s hyoid-bone "trigger" mechanism. This sometimes happens when a seahorse accidentally ingests a foreign object when feeding off the bottom. The offending particle is often a piece of gravel or crushed shell. When a hard, sizable foreign object such as this is ingested, it can lodge in the throat or snout, and the seahorse may have difficulty expelling it again. (The seahorse’s feeding mechanism is much better suited for sucking things in than spitting them out again.) When that happens, the seahorse is almost always able to clear the offending object eventually, but sometimes not before it causes considerable irritation or the repeated efforts to eject it cause a muscular strain to the hyoid trigger mechanism. The seahorse then acts as though it has a very bad sore throat. The suction it generates is weak and both the act of pulling the trigger and the act of swallowing appear to be painful. The seahorse feeds reluctantly or halfheartedly as a result, and may eventually stop feeding altogether. Such mechanical injuries can also open the door for snout rot.
Suspect a mechanical injury when the weak snick or sticky trigger is not accompanied by respiratory distress, when only one of your seahorses is affected and exhibiting unusual symptoms, or when you witnessed the seahorse struggling to expel a foreign object. In such cases, most often the problem clears up on its own after two weeks to two months as the injury heals. No treatment is necessary and the key to a successful outcome is keeping the patient eating while the healing takes place. That’s what treatment should concentrate on.
When these feeding difficulties arise, it’s a good idea to try tempting the affected seahorse with live adult brine shrimp. Seahorses suffering from weak snick induced by an injury may have better luck slurping up smaller, lighter, soft-bodied prey like brine shrimp; if so, that will be enough to keep them going while they heal. You’ll want to enrich the brine shrimp to maximize its nutritional value, and gutloading the shrimp with an enrichment product high in HUFA such as Vibrance is a good way to fortify it beforehand. Brine shrimp are filter feeders that will ingest whatever is suspended in the water with them, so all you need to do is add a pinch or two (or drop or two) of the enrichment formula to a small container of saltwater swarming with brine shrimp at least 30 minutes before you offer the shrimp to your seahorse.
Some hobbyists dealing with weak snick have had good success in coaxing the affected seahorse to feed by transferring the seahorse to a critter keeper or breeder net or similar enclosure that can hang within the main tank itself, and then adding a generous amount of live adult brine shrimp to the container. Within the enclosure, the affected seahorse does not have to compete with its tankmates for the live food, and it is easy to maintain an adequate feeding density within the confined space so that there is always a big juicy brine shrimp passing within striking distance of the hungry seahorse. Add one or two hitching posts within the critter keeper or breeder net so that your male can anchor in place and wait for a tasty brine shrimp to pass within easy reach, and give him an hour or two within the enclosure to eat him fill of the softbodied adult brine shrimp. You can monitor his progress from a nonthreatening distance away from the tank to see how she is doing. In most cases, the seahorse quickly becomes familiar with the routine of being transferred to the special enclosure at feeding time and associates it with tasty live foods and a full belly — positive reinforcements that make it a very nonthreatening, stress-free procedure for the affected seahorse — and, as a result, it may actually come to look forward to it after a few feedings. You can repeat this feeding process two or three times daily in order to fatten him up again, if your schedule allows.
In short, Judy, if the affected seahorse is experiencing respiratory distress or any other indications that suggest the problem could be due to protozoan parasites, please let me know right away and I will provide you with some detailed treatment options explaining how to treat your aquarium to eradicate such protozoan parasites. But if the affected seahorse is not showing any other symptoms other than a loss of suction when feeding, then you’re most likely dealing with a muscular strain or mechanical injury, and keeping your female eating by providing her with abundant softbodied adult brine shrimp to slurp up is probably the best approach to this problem.
In either case, keeping the seahorse feeding or providing her with adequate nourishment is the key to resolving weak snick and other related feeding disorders. Many times the problem will resolve itself over time providing you can keep the seahorse well fed in the meantime. Providing your pony with plenty of softbodied adult brine shrimp that are easy to slurp up and swallow is one way to accomplish this and confining the female H. kuda in a critter keeper surrounded by abundant brine shrimp would assure that she did not have to compete with the other seahorses for this easy-to-swallow softbodied prey.
But sometimes the problem progresses to the point where the seahorse cannot even suck up the softbodied adult brine shrimp. When that’s the case, Judy, handfeeding the seahorse instead is often the best approach. By handfeeding in this case I mean holding one entire, intact (whole and unbroken) frozen Mysis that you have carefully thawed in your fingertips and then placing the head end of the Mysid directly in the mouth of the seahorse. Many times the seahorse will simply spit it out again, but often if you can insert the Mysis into the seahorse’s open mouth far enough, it’s feeding instincts will kick in and take over so that the seahorse slurps up the frozen Mysis almost reflexively. That’s a much less stressful and less invasive method of force feeding a seahorse that sometimes works well (especially if the seahorse is accustomed to being hand fed and doesn’t shy away from the aquarist). When this method of force feeding works well, it can be maintained indefinitely to provide the seahorses with good nourishment until it has recovered and can feed normally again on its own. And handfeeding your female H. kuda would again assure that the younger H. kuda do not steal any of the morsels right out of her snout.
For example, even the magnificent seadragons sometimes develop problems with weak snick and similar feeding disorders, and professional aquarists will use this same method to provide their prized dragons with good nourishment until they recover, as discussed below:
Over the years, we have seen mouth problems develop in some of our dragons. Sometimes it’s attributed to injury. Sometimes we don’t know what causes it, but we are often successful in getting them to recover on their own with just supportive feedings until we observe that they are back to catching food normally. Sometimes this can take a long time…as in a month or two of force feedings before they are back to catching enough on their own to sustain themselves.
Although I have not had experience force feeding ribbon dragons, I have both force fed and tube fed leafy and weedy seadragons. Typically, we force feed numerous frozen mysids to a sick dragon up to 3 times a day. By force feeding, I mean that we very gently place a mysid in the mouth of the animal and then lightly hold a finger in front of it so that it can’t easily spit out the food. Usually they learn pretty quickly that they are getting food this way and start to slurp mysids up as soon as they are put in their mouth. I usually try to get 6-10 mysids in per feeding. It takes good eyesight and a steady hand to make sure you don’t injure their mouth with this method. We have also tube fed using a thick slurry of cyclopeeze or pulverized and moistened pelleted food…usually giving around .3cc per feeding…though it’s dependent on the size of the animal. I think we usually use a 2-3mm french catheter cut down to fit on a small syringe. Again we do this 3 x day. We find that the animals do better with the frequent feedings and usually they go right back to searching for food after being released.
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Best of luck getting your female H. kuda over this hurdle and back to feeding normally on her own again, Judy! Here’s hoping that these difficulties resolve themselves without the need for any further treatment than handfeeding the ailing pony.
Pete GiwojnaMarch 10, 2010 at 3:22 am #5074Judy58Guest
Hi Peter – many thanks as always for the helpful reply – I have transfered my kuda to the sump so she can try and get the food without the others taking it from her and also she has solo access to any copepods/rotifers that are in there – she has definately not got enough suck to pull the food in but as she is not breathing heavy etc I am hoping that it is mechanical and it will right itself and she will get her suck back soon but it’s not looking good as she can’t even suck it to her as it’s passing she waits for it to land and then try’s to suck it up with not much success 🙁 only gets a few tiny bits – will give it another day or so then try and hand feed her but not quite sure on how to hold her properly to do this so that she will take the food and don’t want to stress her any further so any further advice on this would be appreciated – will keep you informed as to her progress – many thanks JudyMarch 10, 2010 at 5:12 am #5075Pete GiwojnaGuest
If you can obtain the softbodied adult brine shrimp, your female may have better luck slurping up the live brine shrimp than the frozen Mysis, now that she is confined to the sump by herself.
If the seahorse is accustomed to handfeeding or has developed a bond of trust with you as its keeper — the giver of gourmet delights and the source of good things to eat — then there is often no need to hold the seahorse at all. It will remain on its perch and allow you to place one of the intact, thawed frozen Mysis in its mouth (headfirst works best for inserting the Mysis), and then take it from there and slurp it down on its own.
If not, if seahorse hasn’t had time to recognize you as the source of all good things and the seahorse shies away from you when you try to feed it the Mysis, then you may have to hold and restrain the pony while it’s hand fed. In that case, you can hold the seahorse the same way you would if you are tube feeding it rather than feeding it by hand. Induce the seahorse to release its grasp on its holdfast (gently shake the holdfast until it attempts to swim away or use the "tickle technique" described at the end of this message to persuade her to let go) and then cup her in your nondominant hand while she is swimming. Encourage the seahorse to wrap its tail around your remaining fingers while you use your thumb and forefinger of your nondominant hand to gently grasp the back of its head and neck. Then you can use your dominant hand to carefully insert one of the Mysis into its mouth headfirst.
Normally seahorses realize they are getting food from this technique right away and cease to struggle or resist. But if the seahorse does not cooperate or spits out the frozen Mysis, you’ll have to be patient and hold it in place longer or work it back further into the mouth of the seahorse until it reflexively swallows it. If the seahorse is uncooperative and handfeeding simply doesn’t work for you, Judy, then you can always resort to tube feeding the seahorse. That is a more invasive procedure that’s best reserved as a last result, however. Let me know if tube feeding becomes necessary, and I will provide you with instructions on how to proceed…
If you have never held a seahorse before, you may be surprised at how strong she is if your female struggles at first, Judy. Composed of solid muscle and endowed with extraordinary skeletal support, the prehensile tail is amazingly strong. Indeed, large specimens have a grip like an anaconda, and when a 12-inch ingens or abdominalis wraps its tail around your hand and tightens its hold, its vise-like grip is powerful enough to leave you counting your fingers afterwards!
In fact, it can be quite difficult to remove an attached seahorse from its holdfast without injuring it in the process. Never attempt to forcibly detach a seahorse from its hitching post! When it feels threatened, it’s instinct is to clamp down and hold on all the tighter. When you must dislodge a seahorse from its resting place for any reason, it’s best to use the tickle technique instead. Gently tickling the underside of the tail where it’s wrapped around the object will usually induce the seahorse to release its grip (Abbott, 2003). They don’t seem to like that at all, and will quickly let go to move away to another spot. Once they are swimming, they are easy to handle.
Best of luck getting some nourishment into your female H. kuda one way or the other, Judy.
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