A few color varieties have been made from the wild species, even some multicolored. Many species of this fish exist, but are not yet officially identified; the three common aquarium species are known as L-018, L-081, and L-177. Sometimes called peacock goby, but a gudgeon. Many freshwater biomes can be found in the Amazon River, Florida, and Russia. It is a breed, that you … they require aquarium salt in the water or hard water. Often confused with the croaking gourami. What is proposed in this story is not an unusual management position: It is currently how we manage trout, bass and walleye (and many other “game” species) in every U.S. state. Loaches are freshwater fish, for example, the clown loach which is a freshwater fish. Investors and policymakers urged not to overlook freshwater fish farms. The Discus fish is a bit easier to raise than the more challenging arowana. Otherwise a peaceful species. 8 minute read; Bleeding Heart Tetra 101: The Complete Care Guide. We quantified the seasonal timing and extent of freshwater fish research. Like all pencilfish, males may be aggressive with each other if the tank or the group of pencilfish is too small. Can only be fed live or frozen foods. Spotted pimelodus, pictus, pictus catfish. 2. They hide during the day. Therefore, they have low ion concentration within their body cells than saltwater. This fish is similar to the neon tetra other than coloration. Question from Student Questions,noclass. This is also an aggressive fish and does best in a species-only setup. It is relatively tolerant of other fish chasing and/or bulling it. Most breeds of “beginner”-level freshwater fish can be fed with a jar of fish food flakes. Freshwater fish are isotonic to freshwater. Production systems. albino variation available. The solution does not stop here though. One of the most popular Hypancistrus species. Accepts a variety of foods (flakes, pellets, krill, brine shrimp, bloodworms, and live prey). The Beluga Sturgeon is the largest freshwater fish in the world. Peaceful when small but should not be kept with other species at adulthood. Be very careful when conducting maintenance on their aquarium and hide any wires because they may chew through the waterproof coverings. This fish largely resembles catfish, and that is why a number of the catfish varieties are usually mistaken for basa fish. Also known as shellcracker for its ability to prey on snails. Does not usually breed in captivity. Nocturnal, can slither around out of water as long as they stay wet. Requires a very large tank. However, 1.75–2% of freshwater is frozen in polar ice caps and glaciers as ice, and 0.5–0.75% exists as groundwater. Many types of aquatic animals commonly referred to as "fish" are not fish in the sense given above; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish. Freshwater only accounts for about 2.5–2.75% of all water on Earth. The Beluga Sturgeon is the source of Beluga Caviar, the most expensive kind of caviar and the most expensive food item in … When setting up your freshwater aquarium it is better to seek professional consultation. The wild type of this species is greenish-gray and rarely seen for sale. Breeding pairs leap to deposit eggs on overhanging leaves; may jump out of uncovered tanks. Gray bichir, Senegal bichir, or dinosaur bichir. Most common variety is the Blue Paradise. Danio is not a picky eater, so it enjoys live foods, dried foods, and pellets. A small shell-dwelling cichlid from Lake Tanganyika. albino variation available. Another extremely popular freshwater fish is the Betta. A gold colored form also exists. Note that Amphilophus labiatus is also called red devil cichlid, Note that Amphilophus citrinellus is also called red devil cichlid, Exceptionally beautiful adult coloration; large adult size, Common, very easy to breed, aggressive. In the scientific community it is not considered a cichlid (or any species of fish) because it does not occur naturally in the wild (created by man), for this reason it will not be given a scientific name. Fairly aggressive, but prefers to live in shoals. Freshwater fish as long as they are caught in clean water are totally fine to eat raw. very peaceful and hardy, and works well with white clouds and neon tetras. fancy hybrids of this species and Symphysodon discus can also be found in trade. Can live without aeration. The worst offender is the Bala Shark – largely because novice aquarium hobbyists simply do not realize how big these fish get. For whatever reason, they just aren’t…, Shubunkin Goldfish are a popular and interesting fish that have earned the attention of aquarists all over the…, Oranda Goldfish are an interesting freshwater fish that bring a unique element of beauty to any aquarium. It’s not easy to change the substrate in your tank once you’ve established an aquatic community. Either way, there is almost a certainty that at one point, you are going to deal with snails. This genus (often represented by N. anomala, the golden dwarf cichlid) is often recommended as one of the best cichlids for new cichlid keepers and smaller aquaria. This species is known for predatory behavior toward tankmates. They are good fish for beginners but only if you pay attention to their tankmates and temperaments. Molly Fish 101: Care, Types, Food, Lifespan & More! Peppered corydoras, salt and pepper catfish, Threestripe corydoras, leopard catfish, false julii cory. Similar to odessa barb but requires somewhat more space. Several color varieties have been bred. There are over 5,300 species of freshwater fish that are raised in captivity by aquarists across the globe. Freshwater is defined as having a low salt concentration — usually less than 1%. Females are larger than males. However, the fish is very peaceful and will not attack another member of the tank. Granted they may not be as tasty or have the mouthfeel of a fatty saltwater fish they are perfectly fine to eat. Used in its native Southeast Asia as a fighting fish; males spar with their elongated lower jaws but rarely harm each other. Arowana are highly sought after fish. Often recommended for smaller tanks and first-time cichlid keepers. User: Which of the following is not a characteristic of the source of rivers and streams?a. various color varieties, the discus requires high water quality and a varied diet. However, a corresponding reflection on the temporal aspects of research has been lacking. You can learn the natural history for each species as well as some cool facts. Freshwater fish are fish that spend some or all of their lives in fresh water, with a salinity of less than 0.05%. The bristlenose genus has at least 59 identified species and many others yet to be named. A very active species. All halfbeaks are sensitive to changes in water quality or temperature, swim at the water surface, do not compete well with larger fish, and may jump out of uncovered tanks. Often recommended for nano tanks. For beginners, start with a simple tank, a good filtration system, and a fish … Needs somewhat more space than N. multifasciatus, Males very aggressive; juveniles distinctively colored, other hemichromis species are sometimes sold under the same name, Lifalili jewel cichlid, blood-red jewel cichlid, Readily breed in small aquaria. A standard choice for "nano" tanks due to small adult size. Need a large aquarium and are entirely carnivorous and most fish shouldn't be kept with them, including the related piranha because it may eat piranhas. The pH of your tap water may not be ideal for the type of fish in your tank, so you need to learn how to test the pH and alter it, if necessary. The neon tetra is sensitive towards water quality. Often confused with the pygmy gourami, but larger. Smaller even than the neon tetra. Common pleco, suckermouth catfish, Amazon sailfin catfish. Long-finned and extra red morphs are available. A schooling species (keep in groups of 8-10). Disease is not a big problem with the black tetra. A freshwater biome can be any pool of water that doesn’t contain salt. Many…, The kissing gourami is a very interesting freshwater fish that stands out no matter what. The oscar is one of the more hardy cichlids, and can be put with other large cichlids. this species may be confused with tiger barb due to similarities, This species is much larger than most other barbs. Freshwater sharks are often sold as juveniles and advertised as community fish. Fish / Freshwater Fish. Also known as the Queen loach. I remember reading reports of them making up a part of the match weights at the time. If you want to cultivate a planted tank that also houses fish, consider some of these top six species. Needs good water quality, prefers low light. Suitable for small to mid-sized aquariums but cannot compete with more aggressive fish and males kept together may fight. It blows our mind…, White Cloud Mountain Minnows are a freshwater fish that we highly recommend. Clown loaches will eventually need a 6' long aquarium. Especially, the hump of this cute chubby fish … Blue Gourami 101: Care, Tank Mates, Lifespan, Size…, Bleeding Heart Tetra 101: The Complete Care Guide, Endler’s Livebearer Care 101 (Poecilia Wingei). Adults of both sexes develop spectacular reflective scales. Not actually a type of killifish but a livebearer. Peaceful and very bold; for example it is unafraid of gravel cleaners and algae scrubbers. Basa fish is among the famed freshwater fish varieties. The black tetra is also known as the black skirt tetra. Cons/Side Effects – Not a permanent “fix” for any disease, as FW dips are not usually effective enough to eradicate all of the parasites/worms afflicting the fish. Freshwater angelfish come in many different color varieties: white, black, gold, silver, etc. Fairly common. It needs a cave, and will feed when the aquarium light is out. Therefore only one male Betta should be kept in each aquarium. Considered most beautiful freshwater fish by some killifish enthusiasts. Likely the most aggressive sunfish. These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. Many aquarium hobbyists underestimate the amount of time and effort it takes to set up and maintain a thriving planted tank. We examine the evolving concept of what constitutes a nonnative (or alien) freshwater fish. They generally need a ratio of 1 male to 2 females or more. Angelfish are not the friendliest fish especially when it comes to feeding time, and they’ll come to the surface of the tank when they see you approaching. The variegated pattern and cute plump body of this fish are often adorable in the eyes of fishkeepers. Fresh water (or freshwater) is any naturally occurring water except seawater and brackish water.Fresh water is generally characterized by having low concentrations of dissolved salts and other total dissolved solids.Though the term specifically excludes seawater and brackish water, it does include mineral-rich waters such as chalybeate springs. A good beginner fish, but sensitive to water quality. Formerly considered conspecific with the spotted sunfish. Can live … Wild type females are larger and much less red than males. This means their body cells contain similar concentrations of ions as freshwater. Despite their lack of eyes, the blind cave tetra can easily avoid other fish and obstacles in the tank. IRL Tilapia is a freshwater fish. Other related fish also share this common name. best kept either alone, or in groups of 5 or more individuals. Of, relating to, living in, or consisting of water that is not salty: freshwater fish; freshwater lakes. All are hardy, peaceful, and highly social; keep in groups. However, saltwater contains a high concentration of ions than freshwater. Contrary to popular belief, freshwater sawfish are not sharks. Read More. Other pencilfish adopt this barred pattern while inactive at night; only N. espei has it at all times. A Freshwater Fish Aquarium is a Superb Hobby. Typical Size: Up to 5.5″ (male) and up to 6.3″ (female) Typical … Generally hardy and peaceful; considered a standard choice for less experienced aquarists. We’ve provided a look into 42 species of freshwater fish—including largemouth bass, walleye, catfish, crappie, northern pike, trout, and more! Based on the form of fish you’ve got, sand is great lining for the foundation of a fish tank, particularly for those with delicate forms of fish. With an endless list of hobbies at your doorstep you may be finding it difficult to choose one which is appropriate for you. If you’re still not sure which is the better option for your freshwater aquarium, then here’s my advice: Killifish of all species breed in captivity but are short-lived by nature; many species live for 1 year and breeding may be triggered by changes in water or temperature. Very similar to N. multifsciatus but similis has striping from the body continue to the head, Often recommended for first-time cichlid keepers. For ideal fish health, freshwater tropical aquariums should be kept at around 77 degrees F but they can easily survive under temperature which ranges from 72 to 82 degrees F. Normal support of aquarium water, including close consideration regarding water temperature, will guarantee that your freshwater tropical fish remain healthy. A freshwater tank can be a glass or acrylic of any size. Short answer: No. If you are ready to start your first successful aquarium but don’t know where to start, you can check out our starter guides section . Investors and policymakers urged not to overlook freshwater fish farms. Pearlscale Goldfish 101: The Essential Care Guide, Dwarf Chain Loach 101: Care, Tank Size, Temperament…, Kissing Gourami 101: Care, Tank Mates, Size & More, Black Phantom Tetra Care: Everything You Need To Know, Emerald Dwarf Rasbora 101: The Complete Care Guide, Shubunkin Goldfish 101: Care, Size, Lifespan & More, Oranda Goldfish 101: Care Tips, Size, Colors, Lifespan…, Buenos Aires Tetra 101: The Complete Care Guide, Texas Cichlid 101: Care, Size, Tank Mates, Breeding…, Denison Barb Care 101 (aka Roseline Shark), Tiger Barb 101: Care, Tank Mates, Size, Breeding & More, Forktail Rainbowfish 101 (Pseudomugil furcatus), White Cloud Mountain Minnow 101: The Full Care Guide, Common Pleco Care: Diet, Size, Lifespan, Tank Size…, Leopard Frog Pleco (L134): The Complete Care Guide. The striking vibrant shades, beautiful pattern, peaceful nature and small size of this freshwater fish makes it the best choice for both beginners and experienced aquarists. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e., ocean). This fish should only be kept by the experienced aquarium keeper. Arowana. This fish is very prone to diseases, and can grow larger than most tetra species. Having a Cichlid aquarium is a bit more challenging, as not all Cichlid species can live together, and not all freshwater fish can live in the same water condition as Cichlids. a number of similar Pangio species are sold under the same name. This fish is very hardy and can stand a variety of water qualities. Anyone remember the cichlids that used to thrive in the St Helens canal years ago? In earlier times, even biologists did not make a distinction – sixteenth century natural historians classified also seals , whales, amphibians , crocodiles , even hippopotamuses , as well as a host of aquatic invertebrates, as fish. Populations vary in color and pattern. Keep in species only tanks or with small. Suddenly, a… Males and female both have long "bristles" on their nose, the males having distinctly longer ones. Many color varieties exist. You can find them in marine environment, brackish water, and fresh water. The oscar cichlid is fast growing and can grow to a very large size when mature, and therefore should be housed in a large aquarium. Males may claim small territories and occasionally minor battles may occur. Like most barbs, needs a diet with some vegetable food or algae. Kissing prochilodus, flagtail Prochilodus. May only eat live food. adj. Water temperature: 73 to 82 °F (~23 to ~28 °C) … A schooling species (keep in groups). Like all pencilfish, it is timid, eats small foods, enjoys live/frozen foods, can be bred in captivity, and cannot compete with aggressive fish. Unfortunately, common names can refer to more than one fish. often sold as freshwater fish, but this species actually thrives in brackish water and may even require saltwater when reaches adulthood, often sold as freshwater fish, but this species prefers brackish water, Very hard to feed it anything but live food, Despite the name, this is not an "eel" but rather a huge knifefish; illegal to possess in some areas; dangerous; very large adult size, Encyclopedia of Aquarium and Pond Fish (2005) (, 500 Aquarium Fish: A Visual Reference to the Most Popular Species, This page was last edited on 18 November 2020, at 00:49. They’re also…, Emerald Dwarf Rasboras are a beautiful freshwater fish that are seriously underrated. I was thinking back to years gone by when we ran a 'Fish Race' on the site, people could submit different fish species they'd caught throughout the year and there was a prize for the one that caught the most. A small shell-dwelling cichlid from Lake Tanganyika. One of the best-known freshwater fish is Angelfish. Aggressive, Very active fish, need many rock caves to allow establishment of territories, Cobalt blue cichlid, cobalt zebra cichlid, 'giraffe' spotting is juvenile coloration only. Sometimes called Feeder platy because can be used to feed larger fish like Stingrays, Payara, Cichlids, Pickerel, Catfish, Sunfish, Arowanas, Gar, Arapaima, and other predator fish. One of the few freshwater aquarium fish that survive in cold water. John. This fish can survive out of the water and ", Albino form is common in the aquarium trade, needs a large aquarium. It is best put with other large tetras or with fish of similar size or larger. This yet to be officially named species is intermediate in scale count between gibberosa and frontosa. I think they were dumped in from someone's fish tank, and thrived because of the warm water outlets. You can feed all types of meaty and vegetative foods to this omnivoros fish. They’re peaceful, low-maintenance, and a lot…, Common Plecos are a very popular freshwater fish that have been kept in the aquarium community for ages.…, The Leopard Frog Pleco (L134) is one of our all-time favorite freshwater fish. Their mouths look small, but may eat smaller fish, as they can open their mouths very wide. They are called Kissing Gouramis because the seem to pucker their lips outwards. One of the more aggressive sunfishes. Most freshwater biomes can be found in moderate climates which also experience substantial amounts of rainfall. When it comes to maintaining water quality in your freshwater aquarium, pH is a significant factor. Simple and comparatively easy to care for, the freshwater aquarium business is a multi-billion dollar industry today. Why a Freshwater Fish Cannot Survive in Saltwater. Neon Tetra (Paracheirodon innesi): This small size freshwater fish is known for its dazzling colors … Could be territorial. The variegated pattern and cute plump body of this fish are often adorable in the eyes of fishkeepers. The inconsistency of freshwater environments means that freshwater fish are a bit more hardy and able to survive in a variety of water conditions (5 to 9 pH). Sometimes called purple sleeper goby. Despite their beauty, the discus is one of the least hardy aquarium fishes available. forestry b. industry c. agricultu Male Bettas are notoriously aggressive towards other males. State fish and wildlife agencies change regulations all the time. Unlike freshwater species, the vast majority of marine fish have not yet been bred in captivity. However, just the opposite is true: Angelfish should not be kept with fish that may nip and annoy it such as some large tetras. It’s not surprising why; Bettas are vibrantly colored, and easy to care for. If it can grow up to 13 feet in length and 400 pounds in weight, of course it can swallow us whole. The heads and entrails of our fish are processed into commercial bait and high nutrient fertilizers. One of the best choices for first-time cichlid keepers and smaller aquaria. Cambodian log sucker, false Siamese algae eater, This species may be sold as Siamese algae eater. By John N Eddie | Submitted On May 28, 2009. Shy but territorial. Their unique appearance and high…, Endler’s livebearers (poecilia wingei) are a gorgeous freshwater species that will catch your eye no matter what. This is because that if two are kept together, the larger fish will pick on the smaller fish. The 13 freshwater fish that we just introduced to you are just a drop in the ocean when compared to the amount of fish that can be found in aquariums around the world. Many color and tail pattern varieties exist. They like river sand in the tank because they like to cover themselves in it. Because of their shark-like appearance, people tend to include schools of this fish species in their shark-themed tanks. Hardiest, easiest-care species of aquarium pencilfish. Distinguished from the similar L. similis by the lack of striping on the face. Rarely breeds in captivity. Until recently considered conspecific with the longear sunfish.  In spite of its small size, it requires a larger tank (30"/29 gal or more), Generally hardy and peaceful. It depends on which fish it. Sufficiently peaceful for larger (40 gal+) home aquariums, though it may bite fishes smaller than its size. Nile Puffer freshwater fish has a striking appearance, and like all other pufferfish can change color depending on its mood. Freshwater definition, of or living in water that is fresh or not salt: freshwater fish. Very likely to jump out of the tank unless there are some floating aquatic plants. Fish chunks in ceviche will turn opaque and firm, but the citric acid does not necessarily kill all the bacteria or parasites in the flesh. One of the most common fish for new aquarists. The largest of the shovelnoses, this catfish grows huge and will need a 450 US gallons (1,700 L) min when mature. Red Tail Sharks have been a popular fish species in the aquarist community for quite … Is there any plans to change/fix it being ocean package and spawning in the ocean instead of lakes and rivers in-game? The most hardy of all the hatchetfish, but not the most plentiful. by Alison Yang; November 1, 2020; Bleeding heart tetras are a wonderful freshwater fish that are hard to ignore. Thread Status: Not open for further replies. Discussion in 'General Discussion' started by Xordaii, Jan 29, 2020.  The name "silver dollar" may also refer to, The red-bellied pacu is a close relative of the. An active, shoaling species; keep in groups, but may be aggressive with members of the same species in smaller (under 40 gal) tanks. This species mainly feeds on algae. Freshwater fish are those that spend some or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 1.05%. Snails can enter your tank purposely or not; sometimes they can sneak into the tank with other fish that are put into the water (as they are caught in the net with the fish) or with the plants that are put into the aquarium. But, as you can see from this article, they have some very precise care requirements. the black phantom tetra enjoy being in groups of 6 or more and a slightly shaded tank. Kite fishing is a new, creative and complicated way to fish. this species may be sold as Siamese algae eater. This fish may nip the fins of slow-moving fish or fish smaller than it. 6+ being the preferred size. A schooling fish (keep in groups). aggressive with other fish of same species. Difficult to keep with other green sunfishes, other sunfishes, or even other perciform fishes in general unless kept in very spacious aquaria or ponds. Eats mainly algae. Sorce Freshwater Company is a Zero Waste business. Every freshwater fish doesn’t have the same quality and taste. One of the several fish sold under this name. Due to their small size, the neon tetra should not be kept with large or aggressive fish. The fish is born with eyes, but they quickly deteriorate leaving behind two scars where the eyes once were. Massive inbreeding has led to high rates of Dwarf gourami iridovirus (DGIV) in pet store fish. By reducing this non-native fish population, we will help restore America's waterways back to their natural ecosystems while feeding America. Freshwater Fish of Hong Kong Introduction Composition of Freshwater Fish in Hong Kong Major Freshwater Fish Habitats Key Species of Conservation Concern Conservation Measures Tips and Codes of Observing Freshwater Fish References Introduction Hong Kong is a small territory on the edge of the northern tropical zone. Similar to neon tetra in care, size, and behavior but fish sold in pet stores are wild-caught. See more. This list gives some examples of the most common species found in home aquariums, List of freshwater aquarium amphibian species, List of freshwater aquarium invertebrate species, List of freshwater aquarium plant species, List of marine aquarium invertebrate species, The Aquarium Wiki Encyclopaedia List of Freshwater aquarium fish, http://www.fishbase.org/summary/Corydoras-haraldschultzi.html, http://www.fishbase.org/summary/Corydoras-sterbai.html, http://www.fishbase.org/Summary/SpeciesSummary.php?ID=12199&AT=Threestripe+corydoras, "Everything You Need to Know About the Bristlenose Catfish", "Phractocephalus hemioliopterus (Red-tail Catfish)", "Hyphessobrycon megalopterus summary page", "Hyphessobrycon herbertaxelrodi summary page", https://en.wikipedia.org/w/index.php?title=List_of_freshwater_aquarium_fish_species&oldid=989269144, Short description is different from Wikidata, Articles with incomplete citations from September 2013, Creative Commons Attribution-ShareAlike License. We’ve been fans of this species…, The blue gourami is a stunning freshwater fish that’s very fun to own. With that in mind, here's an overview of the freshwater fish that are generally acknowledged to be good table fare: Bluegill (Bream) Bluegills are found in most North American waters and are often the first fish that young anglers catch. With the right tank mates that are not small enough to be eaten, they will be peaceful and great in community tanks that are at least 55 gallons. Sensitive to water quality. Some freshwater fish will eat their way through a planted tank in a matter of hours. They’re…, Molly fish are a staple of freshwater fishkeeping, and have been popular among aquarists for quite a while!…, Pearlscale goldfish are a fascinating freshwater fish with quite a unique appearance. aggressive with fish of same species. Granted they may not be as tasty or have the mouthfeel of a fatty saltwater fish they are perfectly fine to eat. This tetra prefers low to moderate lighting. The Wildlife Trusts is a movement made up of 46 Wildlife Trusts: independent charities with a shared mission. There are hundreds of types of freshwater fish you can explore and choose to eat for maximum energy. To survive fresh water, the fish need a range of physiological adaptations. Does not breed in captivity. Like many fishes, more tolerant of distantly related species (i.e. A "neon" form is available; both males and females are bright red. Has been highly inbred in the aquarium trade and often shows poor hardiness. Territorial; keep in groups of 6+ to diffuse aggression between males. Do freshwater fish breed with other freshwater fish? High oxygen level and water quality required in addition to a strong current. Once upon a time, there was this man dangling his feet over a dock in waters of southeastern United States. For more and more folk today they are choosing to own a freshwater fish … Most experts recommend freezing fish at … May hunt and eat aquarium shrimp. Betta is the name of the, Various color varieties each given a different name (blue gourami, gold gourami, and opaline gourami). Lyretail Mollies are available in all of these species, can be cross bred with any species of Molly. In the scientific community it is not considered a cichlid (or any species of fish) because it does not occur naturally in the wild (created by man), for this reason it will not be given a scientific name. The female black tetra is more robust and larger than the male. Catfish, however, do not eat fish food flakes. They are scavengers, and primarily eat food and organic matter that have fallen to the bottom of the aquarium. Contrary to some beliefs, a citrus bath does not actually “cook” meat in the same way heat does. These fish are from the ray species and can grow up to 20 feet (6 meters) in length. FRESHWATER FISH 'FRESHWATER FISH' is a 14 letter phrase starting with F and ending with H Synonyms, crossword answers and other related words for FRESHWATER FISH We hope that the following list of synonyms for the word freshwater fish will help you to finish your crossword today. Their unique appearance and high… Fire Eel (Mastacembelus erythrotaenia) By LIandor. They may eat pond snails kept in aquariums. high oxygen levels b. freshwater fish c. cooler temperatures d. murky waters Weegy: HIGH OXYGEN LEVELS is not a characteristic of the source of rivers and streams. In fact, the Florida Everglades is the largest freshwater biome. 13 Wels Catfish. Less aggressive with members of its own species than most pencilfish; males rarely spar.