Probarbus jullieni, Isok barb : fisheries, aquaculture, gamefish

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Probarbus jullieni Sauvage, 1880

Isok barb
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Image of Probarbus jullieni (Isok barb)
Probarbus jullieni
Photo von Freyhof, J.


Thailand country information

Common names: Pbla yesok, Pla eesok, Pla eun
Occurrence: native
Salinity: freshwater
Abundance: scarce (very unlikely) | Ref: Roberts, T.R., 1992
Importance: highly commercial | Ref: Singhanouvong, D., C. Soulignavong, K. Vonghachak, B. Saadsy and T.J. Warren, 1996
Aquaculture: experimental | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Known from Maeklong, Chao Phraya and Mekong basins. No longer exists as a naturally occurring species in the Chao Phraya ad Meklong basins. Seems not capable of reproducing in reservoirs and will probably disappear from these river basins when stocking of artificially reproduced fish is stopped. May still occur in Nan (Sirikit Dam) from artificially produced fry released by the Dept. of Fish. Staff at Sri Chiengmai near Nongkhai (Ref. 7427). In the Mekong, this fish migrates upstream to spawn from October to February from Kompong Cham in Cambodia to Chiang Khong in Thailand (Ref. 37770). In Sungkom at Nong Khai Province, it migrates together with two other Probarbus species, but spawns separately, during January-February (Ref. 37770). Early stage eggs could be observed in October-November (Ref. 37770). Also undertakes trophic migrations, mainly taken by juveniles and sub-adults at the onset of the flood season. At Nakhon Phanom, juveniles stay near the beach and when the beach begins to be covered with water, they migrate upstream and spend the flood season in flooded areas. At Loei, they move up the Loei River and into flooded areas and at this time, juveniles can not be seen in the Mekong (Ref. 37770). Esteemed food fish. The meat is considered excellent and the eggs are especially priced (Ref. 12369). Museum: Mekong, CAS 63028 (Chiang Khan); CAS 95474 (mainstream near Chiang Khan) (Ref. 5515); also from Phra Nakhon Si Ayutthaya, Kanchanaburi and Ubon Ratchathani (Ref. 37773). Also Ref. 2073, 12369, 26336, 26580, 36654, 43281.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/th.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Roberts, T.R., 1992
National Database:

Common names from other countries

Klassifizierung / Names Namen | Synonyme | Catalog of Fishes(Gattung, Arten) | ITIS | CoL | WoRMS | Cloffa

> Cypriniformes (Carps) > Cyprinidae (Minnows or carps) > Probarbinae
Etymology: Probarbus: Greek, pro = first, in front of + Latin, barbus = barbel (Ref. 45335).
Eponymy: The etymology only helps to the extent that a ‘J Jullien’ collected both holotypes. [...] (Ref. 128868), visit book page.
More on author: Sauvage.

Environment: milieu / climate zone / Tiefenbereich / distribution range Ökologie

; süßwasser; brackwasser demersal; potamodrom (Ref. 37770). Tropical; 28°N - 5°N

Verbreitung Länder | FAO Gebiete | Ecosystems | Vorkommen | Punkt Karte | Einführungen | Faunafri

Asia: Mekong, Chao Phraya and Meklong basins of Indo-China and Thailand, and the Pahang and Perak basins of Malaysia (Ref. 7427). Catch, trade and transportation forbidden in Laos (Ref. 12217).

Size / Gewicht / Alter

Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 150 cm SL Männchen/unbestimmt; (Ref. 30857); common length : 28.0 cm TL Männchen/unbestimmt; (Ref. 2073); max. veröff. Gewicht: 70.0 kg (Ref. 12369)

Kurzbeschreibung Bestimmungsschlüssel | Morphologie | Morphometrie

Rückenflossenweichstrahlen (insgesamt) : 13; Afterflossenweichstrahlen: 8. Differs from P. labeamajor in having only 5 (instead of 6) stripes between lateral line scale row and dorsal fin base; lips not enlarged, free posterior margin of lower lip interrupted at midline; large adults without mentum; maxillary barbel invariably well developed, length one-third or more of eye diameter. The only species in which body stripes may extend to every scale row, but this only occurs in some larger and more darkly pigmented individuals. P. labeamajor and P. labeaminor have no more than three stripes below lateral line scale row, and the abdomen is uniformly white. Adults and larger juveniles of P. jullieni usually have much more red and sometimes yellow coloration on head, body, and fins than the other two species. Scale rows between lateral line scale row and pelvic fin 4.
Body shape (shape guide): elongated; Cross section: compressed.

Biologie     Fachlexikon (Englisch) (z.B. epibenthic)

Inhabits mainly the mainstream of large rivers (Ref. 10431), with sand or gravel substrates and abundant mollusks populations (Ref. 12693). Occurs in deep slow reaches (Ref. 37769). Feeds on aquatic plants, insects and shelled mollusks. Spawns in winter (late December-early February) in big riverine deltas over sand and gravel substrate with water current of 1.3 m/sec (Ref. 6459). Undertakes spawning and trophic migrations in the Mekong basin. Trophic migrations occurs throughout its occurrence range which takes place mainly at the onset of the flood season and are mainly undertaken by juveniles and subadults (Ref. 37770). Upstream spawning migrations take place between October and February from Kompong Cham in Cambodia to Chiang Khong in Thailand. At Chiang Khong , fishermen reported that Probarbus moves up the tributary Nam Ta in Laos to breed in March-April. Three Probarbus species were also reported to migrate together, but spawn separately, in January-February at Sungkom, Nong Khai Province in Thailand (Ref. 37770). Egg is buoyant, yellow and 2 mm in diameter. Hatching occurs in 32 hrs at 23°C (Ref. 6459). An excellent foodfish, sometimes consumed raw, but rather scarce so it fetches a high market price (Ref. 2686). Eggs are especially priced (Ref. 12369). Used to be cultured commercially in Thailand (Ref. 7306). May be caught individually or in small numbers of any size incidentally with gillnetting and other fishing activities, at virtually any time or place in the Mekong mainstream (Ref. 10431), but mostly caught during November-January spawning migration, when it is by far the most important species in fisheries catch (Ref. 12369). In the Mekong this important fisheries species is under serious long-term decline and this decline evidently is basin wide and the most obvious (but not necessarily only) reason is overfishing with gillnets during the reproductive migrations and spawning periods (Ref. 10431). Attains 70 kg or more, but mostly marketed size nowadays are 5-20 kg (Ref. 12369).

Life cycle and mating behavior Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fecundity | Larven

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Roberts, T.R., 1992. Revision of the Southeast Asian cyprinid fish genus Probarbus, with two new species threatened by proposed construction of dams on the Mekong River. Ichthyol. Explor. Freshwat. 3(1):37-48. (Ref. 7427)

IUCN Rote Liste Status (Ref. 130435: Version 2025-1)

  vom Aussterben bedroht (CR) (A2d); Date assessed: 29 January 2019

CITES


CMS (Ref. 116361)

Not Evaluated

Bedrohung für Menschen

  Harmless





Nutzung durch Menschen

Fischereien: kommerziell; Aquakultur: experimental; Sportfisch: ja
FAO - Aquaculture systems: production; ; Publication: search | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.6250   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00468 (0.00187 - 0.01169), b=3.12 (2.90 - 3.34), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophic level (Ref. 69278):  3.2   ±0.40 se; based on food items.
Widerstandsfähigkeit (Ref. 120179):  sehr niedrig, Verdopplung der Population dauert mehr als 14 Jahre. (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Very high vulnerability (90 of 100). 🛈
Preiskategorie (Ref. 80766):   Unknown.
Nutrients (Ref. 124155):  Calcium = 119 [58, 216] mg/100g; Iron = 1.03 [0.59, 1.83] mg/100g; Protein = 17.5 [16.4, 18.5] %; Omega3 = 0.136 [0.063, 0.292] g/100g; Selenium = 68.7 [31.3, 150.8] μg/100g; VitaminA = 15.2 [5.2, 47.7] μg/100g; Zinc = 1.27 [0.87, 1.85] mg/100g (wet weight);