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Biology

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The Banggai cardinalfish is remarkable among marine fishes for the extreme levels of genetic diversity found between its populations. Populations as little as five kilometres apart are as genetically distinct as separate species, a consequence of the Banggai cardinalfish's highly limited dispersal capability, the strong currents and deep channels between the islands preventing interaction with populations at other sites (4) (5) (6). Banggai cardinalfish live in small groups of usually between 1 and 6 individuals, though a group of 500 has been recorded (1). Reproduction in the Banggai cardinalfish begins with the female choosing a male; the pair then separate from the group and establish a territory, aggressively defending it from other fish that come too close. The female then initiates an unusual courtship ritual, swimming alongside the male, bodies touching, and making a trembling motion. This behaviour occurs repeatedly on both sides, with the only signs of the male's receptivity being a darkening of the lower jaw and an occasional opening of the mouth (7). After several hours of this behaviour, the female spawns a mass of up to 75 large eggs (a very small number for a marine fish). These are quickly swallowed by the male, and brooded in a special pouch inside the mouth (2). The eggs take about 20 days to hatch, after which, the newly hatched embryos continue to develop in the male's mouth pouch. After a further 10 days, when the young have reached around five to six millimetres in length, they are released (1). During the 30-day brooding period the male does not eat, and attends to the brood by frequently turning the eggs and expelling dead eggs and embryos. Once the brood are released, the male does not interact with them anymore (7). The small juveniles are most commonly found sheltering around sea anemones for protection. However, older juveniles and adults are more commonly found around branching corals and sea urchins (2) (8). The Banggai cardinalfish feeds principally upon tiny planktonic crustaceans, with copepods, in particular, making up about 80 percent of the diet. Nevertheless, this species is an opportunistic feeder, and will take a variety of small organisms from the water column and the seabed, including marine worms, molluscs and fish larvae. In addition, it plays an important role in its environment by preying on the larval stages of coral reef fishes' parasites (9). The Banggai cardinalfish is preyed upon by various species, such as the crocodile-fish (Cymbacephalus beauforti), various lion-fish species (genus Pterois) and the grouper (Epinephelus merra) (1). This species may live for two years in the wild (2)
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Conservation

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A successful captive-breeding program has been developed by the New Jersey Academy for Aquatic Sciences. However, the aquarium trade has not yet made any significant efforts to replace wild-caught fish with captive-bred fish (1). Although a proposal was made to include the Banggai cardinalfish on Appendix II of the Convention on International Trade in Endangered Species (CITES), thereby regulating international trade, it was rejected due to a conflict of interest (11). Nevertheless, without some kind of action to mitigate the threats to this imperilled species, it faces a very high risk of extinction (1) (11). The only conservation initiative in the Banggai Archipelago is the Banggai Conservation Project, a collaboration between the Indonesian non-governmental organisation, Yayasan Pemerhati Linkungan, and the New Jersey Academy for Aquatic Sciences. Ongoing since 2004, the project aims to create marine protected areas in two zones within the Banggai archipelago. Despite having the approval of the local government and the support of local communities, funding is still required in order to put this vital project into action, which will help protect and conserve this unique species for future generations (12) (13).
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Description

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With its striking patterning and elegant, elongated fins, it is easy to understand why the Banggai cardinalfish has become extremely popular with the aquarium trade (2). The shiny, silvery body is distinctively marked with three vertical black bars, one running down the head and the other two down the fish's flanks. Between the bars on the body, the Banggai cardinalfish is marked with white dots, which form a pattern unique to each individual. The front dorsal fin, is tasselled, and the second dorsal fin, anal fin and caudal fin are elongated. The fins all have black markings and, with the exception of the front dorsal fin, are also marked with white dots (1).
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Habitat

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A tropical marine species, the Banggai cardinalfish occupies shallow coastal waters at depths between 1.5 to 5 metres, but is rarely found deeper than 2.5 m, and water temperatures ranging from 28 to 31 degrees Celsius (2). It generally prefers calmer waters, though some populations live in areas with strong surges and currents. Living near the seabed, this species is most commonly found around coral reefs, but also around seagrass beds and, less commonly, over small, open patches of rubble. Within these environments, it is normally found in association with various bottom-dwelling organisms, such as sea urchins, sea anemones, and branching corals (1) (3).
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Range

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The Banggai cardinalfish has an extremely limited geographic range (1), and is found only at select sites around the coasts of 33 islands in the Banggai Archipelago, an island group in Indonesia. A small population was also artificially introduced into the Lembeh strait in 2000, some 400 kilometres north-west of its natural range. The total suitable habitat available within the Banggai cardinalfish's range amounts to a mere 34 square kilometres (2).
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Status

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Classified as Endangered (EN) on the IUCN Red List (1).
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Threats

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The major threat to the Banggai cardinalfish is overexploitation for the aquarium trade (10) (11). There are currently three main collection centres in the Banggai Archipelago, where as many as 100,000 individuals may be caught monthly from around the islands, before being shipped to Bali and North Sulawesi to be sold to international exporters. During shipping, which may take between 24 hours and 5 days, up to 30 percent of the fish may die, with similar quantities frequently being rejected due to poor condition. A study of the Banggai cardinalfish fishery revealed that during 2007, at least 1,000,000 individuals were caught, which given that the fish's total population in this year was estimated to be 2,200,000 individuals, is a serious cause for concern. Indeed, the increasing levels of exploitation have led to the extermination of two local populations, while the global population of the Banggai cardinalfish is believed to have been reduced to about 10 percent of its historical abundance and range (11). In addition to overexploitation, the Banggai cardinalfish is threatened by habitat destruction as a result of the illegal use of dynamite and cyanide in the fishing of other species. Recently, a viral disease has also emerged in wild-caught individuals kept in captivity, but it is not yet clear how much of a threat this virus will pose to wild populations (2) (11).
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Diagnostic Description

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Description: Characterized by first dorsal fin tasseled; second dorsal fin, long spike-like; caudal fin deeply forked; head and sides with three white-edged black bars; pelvic fins el=enlarged and white-spotted; second dorsal, anal and caudal fin with white-spotted black margins (Ref. 90102).
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Life Cycle

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The male takes the eggs into its mouth where these and the larvae remain until young fish of about 8mm SL are released. Distinct pairing during courtship and spawning (Ref. 205). Also Ref. 240.
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Morphology

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Dorsal spines (total): 8; Dorsal soft rays (total): 14; Analspines: 2; Analsoft rays: 13
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Trophic Strategy

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Common around the jetty, in silty sand bottoms with seagrass (Enhalus acoroides). Groups were seen associated with long-spined Diadema sea urchins (Ref. 54301).Individuals of 2 to 60 hover directly above the urchins, with the younger ones about 2-3 cm SL staying closer to the urchins. The fish retreat among the spines when threatened. Probably feed on small benthic and planktonic crustaceans at night.
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Biology

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Common around the jetty, in silty sand bottoms with seagrass (Enhalus acoroides). Associated with Diadema setosum, the long-spined sea urchins. Individuals of 2 to 60 hover directly above the urchins, with the younger ones about 2-3 cm SL staying closer to the urchins. The fish retreat among the spines when threatened. Probably feed on small benthic and planktonic crustaceans at night. Male incubates the eggs until hatching; the large egg about 2.5 mm in diameter, with the young remaining within the mouth cavity for undetermined period after hatching (Ref. 9936, 48635). Newly hatched larvae have no planktonic period (Ref. 35886). Juveniles also use anemones for protection (Ref. 45560, 48635). Has been reared in captivity (Ref. 35417).
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Importance

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fisheries: of no interest; aquarium: commercial
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Banggai cardinalfish

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The Banggai cardinalfish (Pterapogon kauderni) is a small tropical cardinalfish in the family Apogonidae. It is the only member of its genus.[2] This attractive fish is popular in the aquarium trade. It is among the relatively few marine fish to have been bred regularly in captivity, but significant numbers are still captured in the wild and it is now an endangered species. The detrimental impact of humans on its environment and certain fatal diseases threaten this species' numbers significantly. Iridovirus diseases are known to be significant reason for fish mortality.

Distribution

In the wild, Lembeh Straits, North Sulawesi, Indonesia.

This species is restricted to the Banggai Islands of Indonesia.[3] This species has an extremely limited geographic range (5,500 km2) and small total population size (estimated at 2.4 million).[4] The Banggai cardinalfish is composed of isolated populations concentrated around the shallows of 17 large and 10 small islands within the Banggai Archipelago. A small population also occurs off Central Sulawesi, within Luwuk harbor. One additional population has become established in the Lembeh Strait (North Sulawesi), 400 km north of the natural area of the species distribution, following introduction by aquarium fish traders in 2000.[4] Small populations seen (May 2014) in Secret Bay, north west Bali (Banggai cardinal fish, Secret Bay, Bali)

Description

This species grows up to 8 centimetres (3 in) total length. It is easily differentiated from all other cardinalfishes by its tasseled first dorsal fin, elongated anal and second dorsal fin rays, deeply forked caudal fin, and color pattern consisting of three black bars across the head and body and prominent black anterior edges on the anal and second dorsal fin.[4] The male can be differentiated from the female by a conspicuous, enlarged oral cavity, which is apparent only when they are brooding.[4]

Ecology

The Banggai cardinalfish is the only member of its family that is diurnal.[4] It is a demersal tropical marine fish that forms stable groups of about 9 individuals in shallow water, being most common at 1.5 to 2.5 m in depth. It inhabits a variety of shallow habitats, including coral reefs, seagrass beds, and open areas of sand and rubble. It is most common in calm habitats on the protected side of larger islands.[4] It is often found associated with the seagrass Enhalus acoroides and the long spined sea urchin Diadema setosum.[3] It occurs among various living benthic substrates such as sea urchins, sea anemones, and branching corals; young fish are most commonly associated with sea anemones, while juveniles and adults occur most frequently among long-spined sea urchins and branching corals, as well as sea stars, hydrozoans, and mangrove prop roots.[4] Individuals of 2 to 60 hover above the urchins, with the younger ones about 2 to 3 centimeters SL staying closest to them. The fish retreat among the spines when threatened.[3] Individual fish exhibit well-defined homing behaviour and return to the original location of their group when disturbed.[4] The Banggai cardinalfish often coexists with various anemonefish and anemone shrimp when sheltering in anemones and corals; when found among sea urchin spines, it associates with several other genera of cardinalfish. Following removal of the fish by aquarium collectors, the abundance of associated invertebrates has been shown to decline.[4]

This fish is an opportunistic feeder. Its diet includes planktonic, demersal, and benthic organisms. Copepods constitute the bulk of its diet.[4] It serves as an important food source for several species of lionfish (Pterois spp.), the honeycomb grouper (Epinephelus merra), the crocodilefish (Cymbacephalus beauforti), the snowflake moray (Echidna nebulosa), the estuarine stonefish (Synanceia horrida), and the yellow-lipped sea krait (Laticauda colubrina).[4]

The Banggai cardinalfish is a paternal mouthbrooder.[4] The female plays an active role in courtship and pair formation, which occurs a few hours to a few days before spawning. Mating pairs establish spawning territories several meters away from the main group and vigorously defend them.[4] The eggs are about 2.5 mm in diameter. The young remain in the male's mouth cavity for an undetermined period after hatching.[3] Unlike many other species of marine fish, the Banggai cardinalfish lacks a planktonic stage in its life history.[4] The species has a short lifespan, reaching around 4 years in optimal conditions in captivity, and perhaps 1 to 2 years in the wild.[4]

In captivity

Banggai cardinalfish at the Budapest Zoo aquarium

The Banggai cardinalfish is a popular aquarium fish among fishkeepers.

The fish is collected by local fishers and sold into the aquarium trade. This species first appeared in the international trade around 1995 or 1996. By 2001, 600,000 to 700,000 fish were exported annually. Trade estimates for 2001 through 2004 are 700,000 to 900,000 fish per year with collection occurring throughout the archipelago. Surveys identified significant (>90%) declines in two populations that were fished from 2001 to 2004, including the extinction of a population off of Limbo Island.[4]

This fish has been successfully bred in captivity.[3] Captive breeding presents an alternative to wild-caught fish. Initially, the relatively high cost–benefit ratio of its production combined with the large number of less expensive wild-harvested fish prevented expansion of aquaculture efforts. In recent years, prices for captive bred or aquacultured specimens have plummeted as large numbers have entered the market. As of early 2018 aquacultured individuals are regularly available for as little as $14 U.S. per fish, and aquacultured specimens make up the vast majority of the market. In addition, a newly emerging threat in the form of a viral disease has been documented in wild-harvested individuals maintained in captivity.[4]

Collection for the aquarium trade has threatened this species with extinction.[3] This increases the demand for captive-bred specimens. It is listed as an endangered species by the IUCN based on its small range, the fragmentation of its distribution, and its continuing decline due to exploitation for the international aquarium trade.[1] In 2007, the species was proposed to be listed for protection under CITES Appendix II, which could limit export of wild-caught individuals, but Indonesia would not support this, and the proposal was withdrawn.[5]

Breeding

Life cycle

Banggai cardinalfish are sexually monomorphic.[6] The pairs form up to 2 weeks prior to spawning. The female courts the male from pair formation until spawning.[7] The female's size determines the fecundity and egg size, but the male's size determines the reproductive output, or the number of the eggs that the pair produces.[7] Therefore, pairing tends to occur among individuals of similar sizes, so the male is able to care for all the eggs that the female produces.[6]

Courtship

In Banggai cardinalfish, courtship behavior is usually initiated by the female. Upon choosing a mate, the female isolates her potential mate from other individuals in the colony by creating a spherical spawning site that is about 50–60 cm in diameter.[8] The general movement that the female exhibits is called‘side by side trembling' which is when the female approaches the male from behind with a vigorous trembling motion while the male stays motionless. Then she places herself alongside him and tilts her body thirty degrees outward from its vertical plane, when the male and female's caudal and anal fins come into contact.[8] The female repeats this movement until the male responds with sporadic 'mouth opening,’ a sign of receptiveness. Such courtship behavior may last from several hours to 2–33 days.[8] When an intruder interrupts a female's courtship behavior, the female would rapidly and aggressively chase the intruder away if the intruder is of the same sex.[8] However, when the secondary male, or the intruder male approaches, he, instead of the female, exhibits trembling behavior, and also helps to defend the female and primary male's isolated territory.[8] If the primary male does not respond to female's trembling, the female leaves periodically to visit the secondary male and displays trembling behavior which often results in mating.[8]

Selection of mates

Although the females initiate courtship, female and male cardinalfish are mutually selective. Females have been observed courting larger males more intensively.[7] Even when they are already in the process of courting one male, they often moved on to an intruder male if it is larger than the original.[9] Females have also been observed producing larger eggs for larger, hence more 'attractive,’ males. Females are also able to increase egg size even after the onset of egg maturation if they encounter a new, larger male to brood its eggs.[7] Male Banggai cardinalfish also exhibit preference by size, as larger females tend to lay larger eggs, and egg size positively affects traits such as offspring size, survival, growth, time until maturation, and swimming performance.[7] However, it also takes into account information conveyed by females' courting movement.[10] The 'side by side trembling' described in the previous section can be subcategorized into two different movements: 'rush' and 'twitch'. 'Rush' refers to the first part of the movement when the females approaches the male, folding her pelvic, dorsal, and anal fins together and quickly swimming past the male for a distance of 10–40 cm. Then she performs the 'twitch' by twitching or trembling her body close to the male.[10] The intensity of the 'rush' behavior is important for the male in predicting the female's potential reproductive effort, as the intensity of the behavior correlates positively with clutch weight.[10] However, the number of twitches performed per day strongly associates with how close to spawning the female is.[10] By forming a pair with a female with more mature eggs, or closer to spawning, a male can increase his reproductive rate. Furthermore, he can match his readiness to spawn to females' by observing her 'twitch' behavior.[10]

Reproduction

Spawning

When the male accepts female courting, the female expels eggs from her urogenital papilla. Female Banggai cardinalfish produce a relatively small clutch, consisting of no more than 90 eggs that are 2–3 mm in diameter.[10] Once about three-fourths of the egg mass protrudes from the female, the male takes the eggs from her. This process is immediate, taking no more than 2 seconds.[8] Eggs may be lost in the process if the male drops them, as they are usually immediately consumed by other fish in the area.[8] Males also have the ability to detect dead eggs and expel them from their mouths.[8] The male broods the eggs in his mouth up to 30 days, during which he does not feed.[7] After spawning, the female stays with the brooding male for at least a few days.[9] Females aggressively defend their territory by immediately chasing any intruders that approach the brooding males. They also exhibit a relaxed form of 'side-by-side trembling', and confine the males to a small space.[8]

Juvenile behavior

Juvenile Banggai cardinalfish do not go through any pelagic larval phase.[11] Instead, they experience a high growth rate.[12] Although the free embryos maintain their size difference after hatching, they increase several times in weightwhile being brooded inside their father's mouth. Therefore, at release, juveniles are many times heavier than they were at hatching. Juveniles settle directly within the parents' habitat upon release from their father's mouth.[11] They form a tight school around different structures such as sea urchins, corals, and anemones, and swim around together while the father does not exhibit much caring behavior.[8][13]

Grouping

Banggai cardinalfish live in shallow lagoons in groups that include up to 500 individuals. They are often found near sea urchins, where the fish hide when threatened.[14] They are capable of hiding among the spines of sea urchins without being stung.[13] In addition to sea urchins, other living benthic substrates such as soft corals, anemones, hydrozoans, and mangrove roots also serve as microhabitats around which the cardinalfish group.[12] These groups of fish are rather sedentary, and movements between groups are observed to be very limited, especially because they feed on plankton that pass through water currents.[12][14] Such limited dispersal of Banggai cardinalfish prevents them from spreading over large geographic ranges, thus serving as a major risk of extinction along with heavy exploitation by aquarium fish collectors, as well as low fecundity.[13][15]

Gallery

References

Wikimedia Commons has media related to Pterapogon kauderni.
Wikispecies has information related to Pterapogon kauderni.
  1. ^ a b Allen, G.R.; Donaldson, T.J. (2007). "Pterapogon kauderni". IUCN Red List of Threatened Species. 2007: e.T63572A12692964. doi:10.2305/IUCN.UK.2007.RLTS.T63572A12692964.en. Retrieved 19 November 2021.
  2. ^ Mabuchi, K.; Fraser, T.H.; Song, H.; Azuma, Y. & Nishida, M. (2014). "Revision of the systematics of the cardinalfishes (Percomorpha: Apogonidae) based on molecular analyses and comparative reevaluation of morphological characters". Zootaxa. 3846 (2): 151–203. doi:10.11646/zootaxa.3846.2.1. PMID 25112246.
  3. ^ a b c d e f Froese, Rainer; Pauly, Daniel (eds.) (2015). "Pterapogon kauderni" in FishBase. August 2015 version.
  4. ^ a b c d e f g h i j k l m n o p q Consideration of Proposals for Amendment of Appendices I and II. Convention on International Trade in Endangered Species of Wild Fauna and Flora. Fourteenth meeting of the Conference of the Parties. The Hague. 3–15 June 2007.
  5. ^ Vagelli, A. A. (2008). "The unfortunate journey of Pterapogon kauderni: A remarkable apogonid endangered by the international ornamental fish trade, and its case in CITES" (PDF). SPC Live Reef Fish Information Bulletin. 18: 17–28.
  6. ^ a b Kolm, N. (2002). "Male size determines reproductive output in a paternal mouthbrooding fish". Behavioral Ecology. 63 (4): 727–733. doi:10.1006/anbe.2001.1959. S2CID 53194035.
  7. ^ a b c d e f Kolm, N. & Olson, J. (2003). "Differential investment in the Banggai cardinalfish: can females adjust egg size close to egg maturation to match the attractiveness of a new partner?". Journal of Fish Biology. 63 (1): 144–151. doi:10.1111/j.1095-8649.2003.00205.x.
  8. ^ a b c d e f g h i j k Vagelli, A. (1999). "The reproductive biology and early ontogeny of the mouthbrooding Banggai cardinalfish, Pterapogon kauderni (Perciformes, Apogonidae)". Environmental Biology of Fishes. 56 (1–2): 79–92. doi:10.1023/A:1007514625811. S2CID 6885266.
  9. ^ a b Kolm, N. & Berglund, A. (2004). "Sex-specific territorial behaviour in the Banggai cardinalfish, Pterapogon kaunderni". Environmental Biology of Fishes. 70 (4): 375–379. doi:10.1023/b:ebfi.0000035430.76766.53. S2CID 42705233.
  10. ^ a b c d e f Kolm, N. (2004). "Female courtship in the Banggai cardinalfish: honest signals of egg maturity and reproductive output?". Behavioral Ecology and Sociobiology. 56 (1): 59–64. doi:10.1007/s00265-003-0754-5. S2CID 19317028.
  11. ^ a b Vagelli, A.A. (2004). "Ontogenetic Shift in Habitat Preference by Pterapogon kauderni, a Shallow Water Coral Reef Apogonid, with Direct Development". Copeia. 2004 (2): 364–369. doi:10.1643/ce-03-059r2. S2CID 86018802.
  12. ^ a b c Vagelli, A.A. & Volpedo, A.V. (2004). "Reproductive ecology of Pterapogon kauderni, an endemic apogonid from Indonesia with direct development". Environmental Biology of Fishes. 70 (3): 235–245. doi:10.1023/b:ebfi.0000033338.11355.f9. S2CID 39885519.
  13. ^ a b c Allen, G.R. (2000). "Threatened fishes of the world: Pterapogon kauderni". Environmental Biology of Fishes. 57 (2): 142. doi:10.1023/A:1007639909422. S2CID 38435909.
  14. ^ a b Kolm, N.; Hoffman, E.A.; Olsson, J.; Berglund, A. & Jones, A.G. (2005). "Group stability and homing behavior but no kin group structures in a coral reef fish". Behavioral Ecology. 16 (3): 521–527. doi:10.1093/beheco/ari022.
  15. ^ Bernardi, G. & Vagelli, A. (2004). "Population structure in Banggai cardinalfish, Pterapogon kauderni, a coral reef species lacking a pelagic larval phase". Marine Biology. 145 (4): 803–810. doi:10.1007/s00227-004-1355-1. S2CID 38161941.

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Banggai cardinalfish: Brief Summary

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The Banggai cardinalfish (Pterapogon kauderni) is a small tropical cardinalfish in the family Apogonidae. It is the only member of its genus. This attractive fish is popular in the aquarium trade. It is among the relatively few marine fish to have been bred regularly in captivity, but significant numbers are still captured in the wild and it is now an endangered species. The detrimental impact of humans on its environment and certain fatal diseases threaten this species' numbers significantly. Iridovirus diseases are known to be significant reason for fish mortality.

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