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For other uses, see Goby (disambiguation).
Gobies
Rhinogobiops nicholsii; Blackeye goby.jpg
The blackeye goby (Rhinogobiops nicholsii)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Suborder: Gobioidei
Family: Gobiidae
G. Cuvier, 1816
Subfamilies

See text.

The gobies form the family Gobiidae, which is one of the largest families of fish, with more than 2,000 species in more than 200 genera.[1] Most are relatively small, typically less than 10 cm (4 in) in length. Gobies include some of the smallest vertebrates in the world, such as species of the genera Trimmatom nanus and Pandaka pygmaea, which are under 1 cm (3/8 in) long when fully grown. Some large gobies, such as some species of the genera Gobioides or Periophthalmodon, can reach over 30 cm (1 ft) in length, but that is exceptional. Generally, they are benthic, or bottom-dwellers. Although few are important as food for humans, they are of great significance as prey species for commercially important fish such as cod, haddock, sea bass, and flatfish. Several gobies are also of interest as aquarium fish, such as the bumblebee gobies of the genus Brachygobius. Phylogenetic relationships of gobies have been studied using molecular data.[2][3]

Description[edit]

The most distinctive aspects of goby morphology are the fused pelvic fins that form a disc-shaped sucker. This sucker is functionally analogous to the dorsal fin sucker possessed by the remoras or the pelvic fin sucker of the lumpsuckers, but is anatomically distinct; these similarities are the product of convergent evolution. Gobies can often be seen using the sucker to adhere to rocks and corals, and in aquariums they will stick to glass walls of the tank, as well.

Distribution and habitat[edit]

Gobies are spread all over the world in tropical and temperate near shore-marine, brackish and freshwater environments. Their range extends from the Old World coral reefs to the seas of the New World, and includes the rivers and near-shore habitats of Europe and Asia.[4] On coral reefs, gobies constitute 35% of the total number of fishes and 20% of the species diversity.[5] Gobies are generally bottom-dwellers and live inside the bodies or burrows of invertebrates.

Subfamilies[edit]

Gobiidae contains six subfamilies:

Amblyopinae[edit]

Main article: Amblyopinae

Members of the subfamily Amblyopinae are elongated mud-dwelling gobies commonly known as the eel gobies or worm gobies. Their two dorsal fins are connected by a membranous structure and their eyes are highly reduced. They are usually pink, red, or purple in coloration. Amblyopinae contain 12 genera and about 23 species.[6][7]

Benthophilinae[edit]

Main article: Benthophilinae

Members of Benthophilinae are endemic to the Ponto-Caspian region (including the Marmara, Black, Azov, Caspian, and Aral Seas).[8] The representatives of the subfamily have fused pelvic fins and elongated dorsal and anal fins.[9] They are distinguished from the closely related subfamily Gobiinae by the absence of a swimbladder in adults and location of the uppermost rays of the pectoral fins within the fin membrane.[10] Its members include tadpole gobies, monkey gobies, and bighead gobies.

Gobiinae[edit]

Main article: Gobiinae

Members of Gobiinae are known as true gobies. It is the most widespread and most diverse of the subfamilies under Gobiidae, containing around 2000 species and 150 genera.

Gobionellinae[edit]

Main article: Gobionellinae

Members of Gobionellinae mostly inhabit estuarine habitats, though some are freshwater and a single genus, Gnatholepis, is marine. They are found in tropical and temperate regions around the world with the exception of the northeastern Atlantic Ocean, the Mediterranean Sea, and the Ponto-Caspian region. It includes around 370 species and 55 genera.[11]

Oxudercinae[edit]

Main article: Mudskipper

Members of Oxudercinae are commonly known as mudskippers. They are highly specialized members of the family. They are able to survive for extended periods on land through a combination of behavioral and physiological adaptations, including pectoral fins that act as simple legs; the ability to breathe through their skins (like frogs); and the digging of damp burrows to avoid drying out. Mudskippers live in tidal areas, particularly on mudflats and in mangrove forests, and are only found in tropical and subtropical regions.

Sicydiinae[edit]

Main article: Sicydiinae

Sicydiinae are a small subfamily of freshwater gobies, including only nine genera.[12] They are usually found in fast-moving mountain streams in tropical islands.[13][14]

Ecology and biology[edit]

Gobies are primarily fish of shallow marine habitats, including tide pools, coral reefs, and seagrass meadows; they are also very numerous in brackish water and estuarine habitats, including the lower reaches of rivers, mangrove swamps, and salt marshes. A small number of gobies (unknown exactly, but in the low hundreds) are also fully adapted to freshwater environments. These include the Asian river gobies (Rhinogobius spp.), the Australian desert goby (Chlamydogobius eremius), and the European freshwater goby Padogobius bonelli. Most gobies feed on small invertebrates, although some of the larger species eat other fish, and a few eat planktonic algae.

Reproduction[edit]

Gobies attach their eggs to a substrate, such as vegetation, coral, or a rock surface. They lay from five to a few thousand eggs, depending on the species. After fertilizing the eggs, the male guards the eggs from predators and keep them free from detritus. The male fans the eggs, thereby providing them with oxygen. The female maintains the burrow. The eggs hatch after a few days. The larvae are born transparent, and they develop coloration after spreading to find a suitable habitat. The larvae of many freshwater goby species are carried downstream to the brackish waters, or even to the sea. They return to fresh water weeks or months later.[15]

Gobies in warmer waters reach adulthood in a few months, while gobies in cooler environments reach adulthood in two years. The total lifespan of goby varies from one to ten years, again with the species in warmer waters generally living longer.[15]

Behavior[edit]

Burrow construction[edit]

Gobies usually live in male-female pairs that construct and share burrows, similar to many other fish such as Mozambique tilapia. The burrows are used for shelters and spawning places. Gobies use their mouths to dig into the sea bottom, removing dead coral-fragments, rubble, and benthic algae in order to build their burrows.[16] Gobies maintain their burrows by fanning away sand inside the burrows. Furthermore, gobies use coral rubble to block burrow entrance. A single goby carry as many as nine pieces of coral rubble per minute. Gobies also build a 6–13 cm high mound over the entrance of their spawning burrow.[16] The mound lets the water flow fast over the mound. The water flow created by the mound helps to provide oxygen to the eggs. While burrow building is a cooperative behavior done by both sexes, males usually put more effort in burrow maintenance than females. Females feed more instead, because the reproductive success is optimal when females put more energy in preparing for the reproduction.[17] Interestingly, after spawning eggs, the roles of male and female changes. Females primarily maintain the burrow, and males mainly care for the eggs by fanning them, thereby providing oxygen. When females leave the burrow, however, the mounds lose their heights. The males then give up on the eggs and eat them, preparing for future mating opportunities. Goby burrows vary in size depending on the size of the goby species.[17]

Kleptogamy[edit]

Kleptogamy refers to the sneaking behavior during reproduction. Female gobies prefer male gobies with large bodies. Since not all males have large bodies, the smaller ones may cheat instead of expending energy to find mates.[18] The sneakers wait near the spawning ground of paired gobies. The sneakers then release their sperms on the spawning ground as soon as the paired female releases her eggs.[19] Even though sneakers’ sperms fertilize some eggs, the paired male cannot distinguish the eggs fertilized by the sneakers from those fertilized by his own sperms. Therefore, the paired male equally gives parental care to all the eggs.[20]

Kleptogamy is a good strategy in many ways. First, the sneakers do not need their own territories, indicating that they do not need to spend energy in protecting territories, as most other males do. Most male gobies need their own territories, since females will not choose to mate with a male who does not own his own territory.[18] Secondly, the sneakers do not provide parental care to their eggs. The paired males will provide parental care instead of the sneakers. Therefore, the sneakers can save energy, and they can put more effort into finding new targets for cheating.[18]

The cost of kleptogamy is that the sneakers can receive aggressive attacks from the paired males that are usually much larger and stronger than the sneakers. For small sneakers, the attacks by the paired males can be detrimental and often lead to death.[18]

The sneakers are also referred to as pseudo-females, since they are small and hardly distinguishable from females. This small body size makes cheating easier. The paired males would, most of the time, think that the sneakers are females, and thus the paired males would not chase the sneakers away. The paired males are called “bourgeois” males, because they are larger, stronger, and most importantly, paired.[18]

Sex change[edit]

A few species of goby, such as blackeye goby and Lythrypnus dalli, can change their sexes. Sex change is possible in these gobies, since the external genitalia for males and females do not differ much.[18] Sex changes can take from days to weeks. Most sex changes in gobies are from female to male (protogyny) rather than male to female (protandry). Female-to-male changes are observed not only in gobies but also in wrasses, damselfishes, and sea basses.[18] Female-to-male change usually occurs because the resident male of the group is dead. If there is no male in the group, reproduction will be impossible. Therefore, the dominant female turns into male, allowing mating to happen.[21] Male-to-female change occurs when the females have preference for specific features in males. For example, female gobies prefer large males, and a few large males mate with multiple females, whereas small males lose their chance to mate. Small males either choose to become sneakers (kleptogamy) or choose to transform into females because all females technically have high mating opportunities. By turning into females, males can ensure that they produce many descendants.[18][22]

Some gobies have extraordinarily developed sex change ability. Gobiodon histrio from the Great barrier Reef exhibits bi-directional sex changes. Gobiodon histrio is one of the very few species that can change sex in both ways. It has been shown that when two Gobiodon historio females, used to be males, are on the same coral reef, one of them transformed back into a male goby.[22]

Sex determination[edit]

Sex determination in coral goby Gobiodon erythrospilus does not occur until juvenile gobies meet potential mates.[18] Confronting a potential mate can be difficult for Gobiodon erythrospilus juveniles, since most coral resources, crucial for attracting mates, are occupied by pre-existing paired gobies. Juveniles can only meet potential mates when one member of the pre-existing pairs dies. Juveniles’ sexes are determined according to the sexes of their potential mates. When a juvenile goby meets a female, it becomes a male, and vice versa. This type of sex determination is referred to as socially-influenced sex determination.[23]

Navigation[edit]

Some gobies remember landmarks that are within short distances, and use them to find their ways. Small frillfin gobies (Bathygobius soporator) live in intertidal zones. They swim through the pools during high tides and memorize how each pool connects to the others. Then, during low tides, they can exhibit accurate jumping behaviors, as they have memorized the paths.[24] In a new environment, these gobies do not show jumping behaviors or jump into wrong pools. Nevertheless, after one night, they show the same accurate jumping behaviors.[25]

Habitat choice[edit]

A study was done to understand how gobies react to changing habitat. Gobies were given two choices: a safe habitat with less food and a dangerous habitat with more food. Results from both the full and hungry gobies revealed that gobies, when confronted with the trade-off between foraging and avoiding predation, made choices that would better their foraging.[26]

Some marine gobies live in symbiosis with shrimp.

Symbiosis[edit]

Gobies sometimes form symbiotic relationships with other species,[27] such as with burrowing shrimps. The shrimp maintains a burrow in the sand in which both the shrimp and the goby live. The shrimp has poor eyesight compared to the goby, but if it sees or feels the goby suddenly swim into the burrow, it will follow. The goby and shrimp keep in contact with each other, the shrimp using its antennae, and the goby flicking the shrimp with its tail when alarmed. These gobies are thus sometimes known as "watchmen gobies" or "prawn gobies". Each party gains from this relationship: the shrimp gets a warning of approaching danger, and the goby gets a safe home and a place to lay its eggs. Only the alpha male and female reproduce, other fish in the colony eat sparingly to resist being eaten by the alpha male or female. This way, only the largest and fittest are able to reproduce.[citation needed]

Another example of symbiosis is demonstrated by the neon gobies (Elacatinus spp.). These gobies, known as "cleaner gobies", remove parasites from the skin, fins, mouth, and gills of a wide variety of large fish. The most remarkable aspect of this symbiosis is many of the fish that visit the gobies' cleaning stations would otherwise treat such small fish as food (for example, groupers and snapper). Again, this is a relationship where both parties gain: the gobies get a continual supply of food as bigger fish visit their cleaning stations, and the bigger fish leave the cleaning stations healthier than they were when they arrived.

Another form of symbiosis exists between gobies and the mushroom coral Heliofungia actiniformis (Fungiidae), in which representatives of the genus Eviota roam among the tentacles possibly hiding from predators.[28]

Commercial importance[edit]

Dried gobies for sale on the market in Odessa, Ukraine

Gobies have commercial importance in Ukraine. They are fished in the Sea of Azov, northwestern Black Sea. Most important species are round goby, monkey goby, toad goby, and grass goby. The grass goby is also a commercial fish in Italy.

In aquariums[edit]

Several species of gobies are kept in aquaria.[29] Most captive gobies are species from saltwater, and make excellent additions to healthy reef or fish-only aquariums. Perhaps the most popular is the small but colorful neon goby. Most gobies stay toward the lower portion of the aquarium, hiding in the rockwork, but some species (most notably the shrimp gobies) prefer to dig themselves little burrows. Aquarists typically provide them with a fine-grained substrate to prevent damage to their delicate undersides.

Commonly kept saltwater species include the Randall's shrimp goby, and watchman goby. The bumblebee gobies from the genus Brachygobius are perhaps the most widely traded freshwater species, being small, colorful, and easy to care for. They need tropical, hard and alkaline freshwater or slightly brackish conditions to do well.

Gobies are generally peaceful towards their tankmates, though territorial among themselves. Since most are small and few are predatory toward other fishes, they usually make good community fishes. Typically, the main problem with gobies is feeding them; with a few exceptions, the small species kept in aquariums prefer live or frozen foods rather than flake, and they are not very good at competing with active species such as cichlids. Another problem is they commonly jump out of the tank, so having a tight-fitting lid is a must. They are recommended to be kept on their own or with peaceful surface dwelling species, such as halfbeaks and guppies.

See also[edit]

  • Sleeper gobies are a closely related family (Eleotridae) that lack the fused pelvic fin sucker typical of most gobies, but are otherwise very similar in size, shape, and ecology.
  • Blennies are a group of shallow-water marine fish often confused with gobies.
  • Dragonets are superficially similar to gobies and sometimes confused with them.
  • Pholidichthys leucotaenia is commonly called the engineer goby or convict goby, but is not a goby.

References[edit]

  1. ^ Patzner, R.A.; Van Tassell, J.L.; Kovačić, M.; Kapoor, B.G., ed. (2011). The Biology of Gobies. Enfield, NH: Science Publishers. p. 685. ISBN 978-1-57808-436-4. 
  2. ^ Agorreta, A.; San Mauro, D.; Schliewen, U.; Van Tassell, J.L.; Kovačić, M.; Zardoya, R.; Rüber, L. (2013). "Molecular phylogenetics of Gobioidei and phylogenetic placement of European gobies". Molecular Phylogenetics and Evolution 69 (3): 619–633. doi:10.1016/j.ympev.2013.07.017. PMID 23911892. 
  3. ^ Agorreta, A.; Rüber, L. (2012). "A standardized reanalysis of molecular phylogenetic hypotheses of Gobioidei". Systematics and Biodiversity 10 (3): 375–390. doi:10.1080/14772000.2012.699477. 
  4. ^ Thacker, Christine E.; Dawn M. Roje (2011). "Phylogeny of Gobiidae and identification of gobiid lineages". Systematics and Biodiversity 9 (4): 329–347. doi:10.1080/14772000.2011.629011. 
  5. ^ Winterbottom, Richard; et al (2011). "Life span, growth and mortality in the western Pacific goby Trimma benjamini, and comparisons with T. nasa". Environmental Biology of Fishes 91 (3): 295–301. doi:10.1007/s10641-011-9782-6. 
  6. ^ Edward Murdy (2011). "Systematics of Amblyopinae". In B.G. Kapoor. The Biology of Gobies. Science Publishers. pp. 107–118. doi:10.1201/b11397-10. ISBN 978-1-4398-6233-9. 
  7. ^ WoRMS (2012). "Amblyopinae". In Nicolas Bailly. FishBase. World Register of Marine Species. Retrieved February 27, 2012. 
  8. ^ Simonović P.D., Nikolić V.P., Skóra K.E. (1996) Vertebral number in Ponto-Caspian gobies: phylogenetic relevance. J. Fish Biol., 49: 1027–1029.
  9. ^ Miller P.J. (1986) Gobiidae. In: Whitehead P.J.P., Bauchot M.-L., Hureau J.-C., Nielsen J., Tortonese E. (eds.) Fishes of the North-eastern Atlantic and the Mediterranean, Vol. 3. UNESCO, Paris.
  10. ^ Pinchuk V.I. (1991) K voprosu o grupirovkakh vidov v predelakh roda Neogobius (Perciformes). Voprosy Ikhtiologii, 31: 380–393.
  11. ^ Frank Pezold (2011). "Systematics of the Family Gobionellidae". In Robert Patzner, James L. Van Tassell, Marcelo Kovacic, and B. G. Kapoor. The Biology of Gobies. Science Publishers, Inc. ISBN 978-1-57808-436-4. [dead link]
  12. ^ Keith, P.; Marquet, G.; Taillebois, L. (2011). "Discovery of the freshwater genus Sicyopus (Teleostei: Gobioidei: Sicydiinae) in Madagascar, with a description of a new species and comments on regional dispersal". Journal of Natural History 45 (43–44): 2725. doi:10.1080/00222933.2011.602479.  edit
  13. ^ Ronald E. Watson & Maurice Kottelat (2006). "Two new freshwater gobies from Halmahera, Maluku, Indonesia (Teleostei: Gobioidei: Sicydiinae)". Ichthyological Exploration of Freshwaters 17 (2): 121–128. 
  14. ^ Ronald E. Watson, Philippe Keith, & Gérard Marquet (2007). "Akihito vanuatu, a new genus and new species of freshwater goby (Sicydiinae) from the South Pacific". Cybium 31 (3): 341&–349. [dead link]
  15. ^ a b Hoese, Douglas F. (1998). Paxton, J.R. & Eschmeyer, W.N., ed. Encyclopedia of Fishes. San Diego: Academic Press. pp. 218–222. ISBN 0-12-547665-5. 
  16. ^ a b Reebs, Stephan. "Can fishes build things?". 
  17. ^ a b Takegaki, Takeshi; Akinobu Nakazono (June 1999). "Division of labor in the monogamous goby, Valenciennea longipinnis, in relation to burrowing behavior". Ichthyological Research 46 (2): 125–129. doi:10.1007/BF02675430. 
  18. ^ a b c d e f g h i Reebs, Stephan. "The sex lives of fishes". 
  19. ^ Svensson, O.; Kvarnemo (2007). "Parasitic spawning in sand gobies: an experimental assessment of nest-opening size, sneaker male cues, paternity, and filial cannibalism". Behavioral Ecology 18 (2): 410–419. doi:10.1093/beheco/arl098. 
  20. ^ Svensson, O; Magnhagen, C.; Forsgren, E.; Kvarnemo, C. (1998). "Parental behaviour in relation to the occurrence of sneaking in the common goby". Animal Behaviour 56 (1): 175–179. doi:10.1006/anbe.1998.0769. PMID 9710475. 
  21. ^ Lorenzi, V.; Earley, R.L.; Grober, M.S. (2006). "Preventing behavioural interactions with a male facilitates sex change in female bluebanded gobies, Lythrypnus dalli". Behavioral Ecology and Sociobiology 59 (6): 715–722. doi:10.1007/s00265-005-0101-0. 
  22. ^ a b Munday, P.L.; Caley, M.J.; Jones, G.P. (1998). "Bi-directional sex change in a coral-dwelling goby". Behavioral Ecology and Sociobiology 43 (6): 371–377. doi:10.1007/s002650050504. 
  23. ^ Hobbs, J.-P. A.; Munday, P.L.; Jones, G.P. (2004). "Social induction of maturation and sex determination in a coral reef fish". Proceedings of the Royal Society of London. B 271 (1553): 2109–2114. doi:10.1098/rspb.2004.2845. 
  24. ^ Reebs, Stephan. "How fishes find their ways around". 
  25. ^ Aronson, L.R. (1971). "Further studies on orientation and jumping behaviour in the Gobiid fish, Bathygobius soporator". Annals of the New York Academy of Sciences 188: 378–392. Bibcode:1971NYASA.188..378A. doi:10.1111/j.1749-6632.1971.tb13110.x. PMID 5288865. 
  26. ^ Magnhagen, C. (1988). "Changes in foraging as a response to predation risk in two gobiid fish species, Pomatoschistus minutus and Gobius niger". Marine Ecology Progress Series 49: 21–26. doi:10.3354/meps049021. 
  27. ^ G. S. Helfman, B. B. Colette & D. E. Facey (1997). "Chapter 21: Fishes as social animals". The Diversity of Fishes. Blackwell. ISBN 0-86542-256-7. 
  28. ^ Bos, Arthur R (2012). "Fishes (Gobiidae and Labridae) associated with the mushroom coral Heliofungia actiniformis (Scleractinia: Fungiidae) in the Philippines". Coral Reefs 31: 133. doi:10.1007/s00338-011-0834-3. 
  29. ^ Schäfer, Frank (2005). Brackish-Water Fishes. Aqualog. ISBN 978-3936027822. 

External links[edit]


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The Epoch Times
Wed, 27 Aug 2014 17:33:45 -0700

Dominic Boileau was visiting a pet shop in Ottawa, Canada, when he came across this Sand Sifting Goby fish gulping down some food. In this close-up footage, the fish appears to ingest food, only to pass some back out through a passage at the back of ...
 
The Post-Standard - syracuse.com
Tue, 12 Aug 2014 05:56:15 -0700

Brewerton -- Onondaga County Undersheriff Warren Darby erased any doubt Monday night that round gobies, an invasive fish species, have made their way into Oneida Lake. Darby, who lives in Brewerton, is a board member of the Oneida Lake Association.

Michigan State University Extension

Michigan State University Extension
Fri, 15 Aug 2014 06:06:48 -0700

A study of round goby invasion in Wisconsin streams suggests that impacts to stream insects and fish may not be severe. However, the effects of gobies in high-quality trout streams of Michigan have never been studied. Round gobies are well-known egg ...
 
GoErie.com
Mon, 11 Aug 2014 20:56:15 -0700

Anglers who find a round goby in Pennsylvania waters other than Lake LeBoeuf, Gravel Pit Pond or Lake Erie are asked by the commission to kill the fish, freeze it and call 474-1515 or report it online at http://fishandboat.com/ais-reporting.htm.
 
CBC.ca
Mon, 04 Aug 2014 06:36:35 -0700

A few Ontario anglers have been fined recently — not for what they're catching — but for what they're using on their hooks. The Ministry of Natural Resources and Forestry reports the anglers were using Goby, an invasive species, as bait. MNRF ...
 
FLW Outdoors
Mon, 01 Sep 2014 03:30:00 -0700

I've got two clownfish; there's a good bit of coral in there, a lawnmower blenny, a Mandarin goby and a few others. 3. Is that a lot to care for? It's not too bad. It was a fun project, and since I got it up and going it has been pretty easy. 4. What's ...
 
Chesterton Tribune
Fri, 29 Aug 2014 13:26:15 -0700

The team also detected genetic material from round goby, tubenose goby and Eurasian rudd, which are already in the Great Lakes although authorities hope to prevent them from reaching inland lakes and other waters. They also found traces of goldfish, ...
 
Utica Observer Dispatch
Sat, 30 Aug 2014 14:08:12 -0700

And another thing anglers will be sure to notice once the goby population explodes: if your bait is on the bottom, you'll catch a lot more gobies than bass and walleyes. One day several years ago on the Niagara River, we caught one big smallmouth, then ...
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