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Large Spot Stingray
(Potamotrygon falkneri) Moderate Semi-aggressive 18" 180 gallons 75 - 84° F, pH 6.0-7.0, KH 2-10 Carnivore Amazon, Brazil, Paraguay, Argentina Potamotrygonidae Stingrays Large-Bottom-Dweller The Large Spot Stingray (Potamotrygon falkneri) is a very attractive species of South American Stingray that is found in the Rio Parana and Rio Paraguay basins and surrounding flood plains. Their territory stretches from Paraguay and Brazil in the north down to Argentina in the south. Their habitat is similar to that of other Potamotrygonidae as it inhabits the sand and mud river banks, shallows, slower moving river tributaries and nearby forest flood plains during the annual wet season. It is not uncommon for the Large Spot Stingray to end up in lakes and ponds that are formed by the receding flood waters. The Large Spot Stingray is considered a peaceful species towards other large predatory fish; however, they are top level predators in their native ecosystems who will prey on any fish, invertebrate or crustacean that is small enough to be consumed as food. Large Spot Stingray are moderately difficult to keep in the home aquarium; however, if some standard rules for caring for rays are closely adhered to the Large Spot Stingray should be reasonably easy to keep. Aquariums containing rays need to have very clean water that is low in dissolved solids and allows for consistent stable water parameters with minimal fluctuations in pH & nitrates, along with ammonia and nitrite that are kept at non-detectable levels. Strong mechanical, biological and chemical filtration will need to be supplemented by regular water changes in order to keep nitrate levels consistently low. Rays eat quite a bit and are a large bodied fish that will put out a size able amount of waste for the filtration system to keep up with. Therefore, a properly running filtration system will generate a good amount of nitrates in response to the heavy bio-load. Typically frequent water changes are used to keep nitrates low, but other methods like nitrate removing aquatic vegetation within a sump can also be used in conjunction with water changes to keep nitrates low. The aquarium decor should be designed with the ray in mind, which means a soft sandy substrate and a large amount of swimming room with minimal rock, wood and plant decor. Large Spot Stingrays can sometimes be difficult to begin eating when introduced into the aquarium. In this case it is best to substantial dim or turnoff the aquarium lights, then offer earthworms or black worms to help stimulate feeding. Once feeding, Large Spot Stingrays are known to be very aggressive feeders that will consume a large variety of meaty offerings. Part of successful ray husbandry is to house them with compatible tank mates that will not harm the ray or become an unwanted food source. Any fish species small enough to be consumed by the ray will at some point be eaten. Rays generally prey on fish while they sleep, enveloping and swallowing them while they are in a semi-conscious state. Good tank mates for Rays include larger Cichlid and Central/South American fish species that are semi-aggressive in nature and large enough to not become food for the Ray. Top water fish species like Arowana and Cichla are a natural fit to be housed with Rays as they inhabit a different area of the aquarium. In their native habitat Large Spot Stingray feed mostly on small fish, worms, crustaceans and aquatic invertebrates. They are adept at rooting prey out of the substrate and at using their large oval disc to capture small fish and crustaceans. The Large Spot Stingray has a very active metabolic rate that requires they be fed multiple times per day. It is especially important to get newly added aquariums specimens eating right away to ensure that they do not suffer from lack of nutrition. Live foods work best to get newly added or picky specimens eating right away. Live worms and feeder shrimp work best to stimulate the Rays appetite. Once they are settled into the aquarium environment and feeding on earth worms and feeder shrimp, they can then be weaned onto a diet of fresh or frozen dead alternatives. Hobbyists should ideally feed Large Spot Stingray 2 to 3 small meals per day, comprised of a variety of meaty foods including: earth worms, blood worms, glass shrimp, krill, mussels, cockles, prawns, squid, chopped fresh fish and other similar items. Rays should not be fed mammal flesh like chicken livers or beef heart as they have a difficult time metabolizing these types of food and they will develop unhealthy fat buildup and possible organ degeneration.
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Jaguar Ray
(Potamotrygon Otorongo) Moderate Semi-Aggressive 24" 180 gallons 74-82° F, KH 8-12, pH 6.0-7.5 Carnivore South America Potamotrygonidae Stingrays Large-Bottom-Dweller Jaguar Rays (Potamotrygon Otorongo) inhabit the many river basins of South America and the Amazon. They are a bottom dwelling species that spend much of their time hunting along the riverbed for worms, crustaceans and small fish on which to prey. When not searching for food, Jaguar Rays will often partially bury themselves in the sandy substrate of the riverbed to provide them camouflage and provide a sense of protection from potential predators. As with other species of freshwater stingrays, it is often difficult to make positive identifications based on pattern and coloration alone. When attempting to positively identify a Jaguar Ray it is important to look for a powerfully built tail which is noticeably longer than the body. The upper surface of the tail should have either irregularly light spots or a dark background covered in dark lines on a lighter background. The lower half of the tail appears striped or barred when viewed laterally. The body disc has a fine light edge which is not always noticeable. Jaguar Rays are fairly common within the aquarium hobby, especially with specialized dealers that deal in the more exotic rays and cichlids of South America. Jaguar Rays are considered moderately difficult to keep; however, if some standard rules for caring for rays are adhered to, the Jaguar Ray should be reasonably easy to keep. Aquariums containing rays need to have very clean water that allows for consistent stable water parameters with minimal fluctuations in pH & nitrates, along with ammonia and nitrite that are kept at non-detectable levels. Strong mechanical, biological and chemical filtration will need to be supplemented by regular water changes or some form of nitrate/nutrient export, in order to keep nitrate levels consistently low. Rays eat quite a bit and are a large bodied fish that will put out a sizable amount of waste for the filtration system to keep up with. Therefore, a properly running filtration system will generate a good amount of nitrates in response to the heavy bio-load. Typically frequent water changes are used to keep nitrates low, but other methods like nitrate removing aquatic vegetation within a sump can also be used in conjunction with water changes to keep nitrates low. The aquarium decor should be designed with the ray in mind, which means a soft sandy substrate and a large amount of swimming room with minimal rock, wood and plant decor. Jaguar Rays can sometimes be difficult feeders when first introduced into the aquarium. In this case it is best to substantial dim or turnoff the aquarium lights, then offer earthworms or black worms to help stimulate feeding. Once feeding, Jaguar Rays are known to be very aggressive feeders that will consume a large variety of meaty offerings. Jaguar Rays can be fed a wide variety of different meaty foods including: beef heart, fish flesh, earth worms, krill, blood worms, table shrimp, clams and small fish like minnows, silversides or similar feeder fish. Earthworms black worms and invertebrates rank up very high on the Jaguar's favorite foods list and is a good food choice to get them eating when first introduced to the aquarium. They can then be fed a more varied diet as they become settled within the aquarium and become more accustomed to accepting food from their owner. Any crustaceans present in the aquarium will be treated as a prey item and should only be present within a ray aquarium if intended as a food source. They are aggressive feeders once they become fully acclimated to the aquarium environment and have begun accepting foods.
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Motoro Stingray
(Potamotrygon Motoro) Moderate Semi-aggressive 36" 180 Gallons 75-82° F, KH 8-14, pH 5.0-6.5 Carnivore South America, Amazon River basins Potamotrygonidae Stingrays New World Cichlid Aquarium Motoro Stingray's are found living throughout South America including Argentina, Venezuela, Brazil, Bolivia, Colombia, French Guyana, Guyana, Peru, Surinam, Paran-Paraguay, Orinoco, and Amazon River basins. In the wild they spend the majority of their time along the river beds in search of worms or invertebrates on which to prey. As they spend much of their time on the river or pond bottom, they have adjusted to lower light levels and will prefer lower lighting levels in their aquarium home as well. Motoro Stingray's like other rays will bury themselves within the substrate of their environment as a form of protection when they feel threatened. Therefore a substantial soft substrate should be provided to them in the aquarium in order to simulate their wild habitat. Like other stingrays, the Motoro is a high-metabolic fish that is in near constant movement and feeds many times throughout the day. This high metabolism also means that they produce a lot of waste, which requires a strong biological and chemical filtration system in order to provide them the very high quality water they need to survive and thrive within the aquarium environment. Motoro Stingray's are considered moderately difficult to keep; however, if some standard rules for caring for rays are closely adhered to the Motoro Stingray should be reasonably easy to keep. Aquariums containing rays need to have very clean water that allows for consistent stable water parameters with minimal fluctuations in pH & nitrates, along with ammonia and nitrite that are kept at non-detectable levels. Strong mechanical, biological and chemical filtration will need to be supplemented by regular water changes in order to keep nitrate levels consistently low. Rays eat quite a bit and are a large bodied fish that will put out a sizable amount of waste for the filtration system to keep up with. Therefore, a properly running filtration system will generate a good amount of nitrates in response to the heavy bio-load. Typically frequent water changes are used to keep nitrates low, but other methods like nitrate removing aquatic vegetation within a sump can also be used in conjunction with water changes to keep nitrates low. The aquarium decor should be designed with the ray in mind, which means a soft sandy substrate and a large amount of swimming room with minimal rock, wood and plant decor. Motoro Stingray's can be feed a variety of different meaty foods including: beef heart, fish flesh, earth worms, krill, blood worms, table shrimp, clams and small fish like minnows, silversides or similar feeder fish. Earthworms and invertebrates rank up very high on the Motoro's favorite foods list and is a good food choice to get them eating when first introduced to the aquarium. They can then be fed a more varied diet as they become settled within the aquarium. Any crustaceans present in the aquarium will be treated as a prey item and should only be present within a ray aquarium if intended as a food source.
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