Volume 19, Issue 2 – 26 April 2013
Volume 19, Issue 2 – 26 April 2013
Karuppiah Kannan, Jeyaraj A. Johnson and H. Malleshappa: Growth and condition of an endangered
fish Dawkinsia tambraparniei (Cypriniforms: Cyprinidae) from southern Western Ghats, India, pp. 61-66
Growth and condition of Dawkinsia tambraparniei were examined using the linear length-weight relationship model and the condition factor. A total of 135 fishes were sampled from four lower order streams (Manimuthar, Karayar, Servalar and Kallar) and the downstream section (Kokkarakulam) of the Tamiraparani River in southern Western Ghats, India. The results showed that the exponential values ‘b’ ranged from 2.57 to 3.64 with the highest ‘b’ value obtained for the population from Kokkarakulam. The analysis of condition factor also revealed a high condition factor (K=1.56) for the population from Kokkarakulam. The present findings indicate that of the four D. tambraparniei populations examined, the population inhabiting the downstream section of the Tamiraparani River is healthiest.
Dawkinsia tambraparniei (Silas 1953). Photo by J. A. Johnson
Yazdan Keivany: Threatened fishes of the world: Aphanius isfahanensis Hrbek, Keivany & Coad, 2006 (Cyprinodontidae), pp. 67-70
The systematics, morphology, ecology and biology of an Isfahan endemic toothcarp, Aphanius isfahanensis Hrbek, Keivany & Coad, 2006 (Cyprinodontidae) are summarized. This fish is not listed in IUCN’s Red Data Book, but it should be due to criteria such as restricted distribution, destruction of spawning grounds, dam construction, and environmental pollution. This vulnerable species has considerable ecological importance, but there are little data on its biology. The limited data on its distribution, ecology, reproduction and threats are summarized and discussed.
Photo of a male Aphanius isfahanensis in an aquarium. Photo by H. Bleher.
K. K. Bineesh, K. V. Akhilesh, E. M. Abdussamad and N. G. K. Pillai: Chelidoperca maculicauda, a new species of perchlet (Teleostei: Serranidae) from the Arabian Sea, pp. 71-78
A new species of serranid fish, Chelidoperca maculicauda n. sp. is described based on three specimens, (123-129 mm SL), recently collected from the Arabian Sea, off Quilon, Kerala, India. The combination of caudal fin shape and a unique color pattern of five red bars on a pinkish body and pale yellow fins with a bright red margin on the anal fin, a small grey spot distally on the dorsal half and bluish white spots on ventral half of the caudal fin, distinguishes the new species from other congeners. Other distinguishing characters include: fourth dorsal spine longest 2.8 (3) in head length; body depth 23.3 (22.8-24.5) % SL (standard length), 4.3 (4.1-4.4) in SL; head length 40.3 (42.3-42.6) % SL; orbital length 9.3 (8.9-9.1) in SL; 2.5-3 scales above lateral line to dorsal origin; serrae on margin of preopercle 40-46. Lateral-line scales 42; dorsal fin continuous, with ninth dorsal spine shorter than tenth spine; longest dorsal soft ray (7th or 8th) 2.4 (2.3-2.4) in head length.
Chelidoperca maculicauda n. sp., holotype, CMFRI GB 31. 139.14. 5, 127 mm SL, off Quilon, Kerala, India.
Gerald R. Allen, William M. Brooks and Mark V. Erdmann: Eviota pamae, a new species of coral reef goby (Gobiidae) from Indonesian seas, pp. 79-84
Eviota pamae is described from 42 specimens, 9.6-17.7 mm SL, collected at Kei Besar, Kei Islands, Maluku Province, Indonesia. It is closely related to E. raja, an allopatric species known only from the Raja Ampat Islands, off the western tip of New Guinea (West Papua Province, Indonesia). The two species differ in colour pattern details, including the presence of a single dark mark on the lower caudal-fin base of E. pamae compared to marks on both the upper and lower base in E. raja. The new species also differs in having a yellow rather than white mid-dorsal snout stripe and has a much-reduced blue marking on the lower cheek. Meristically, the two species differ in counts for segmented rays in the second dorsal fin (usually 8-9 in E. pamae and usually 10 in E. raja).
Underwater photograph of Eviota pamae, male, about 17 mm SL, Kei Besar, Kei Islands, Indonesia. Photo by G. R. Allen.
Tyson R. Roberts: Leptophilypnion, a new genus with two new species of tiny central Amazonian gobioid fishes (Teleostei, Eleotridae), pp. 85-98
Leptophilypnion pusillus new genus and species is described from three specimens, 8.4-9.1 mm standard length, collected in the central lowland Amazon basin at a single locality near Santarém. A gravid female 9.1 mm standard length has 5-6 oval eggs 0.5 mm long. The new fish is distinguished readily from the only other previously described Amazonian eleotrids, the three species of the genus Microphilpnus Myers 1927, by adults having head and body anterior to second dorsal fin scaleless; two innermost rays of each pelvic fin simple and filamentous, extending to or beyond anal fin origin; head relatively large and snout truncate or blunt (vs. head smaller and snout relatively pointed); body and caudal peduncle relatively short and deep instead of slender; and only 5 instead of 6 branchiostegal rays. A second species of the new genus, L. fittkaui, is described from 10 specimens 8.9-9.7 mm from a locality near Manaus.
Leptophilypnion is perhaps most closely related to the Central American freshwater eleotrid genus Leptophilypnus Meek and Hildebrand 1916, particularly the species L. guatemalensis, with which L. pusillus agrees in having the unusual dorsal fin spine pterygiophore to neural spine insertion formula of 3-12201 and 10+16=26 vertebrae. L. fittkaui, a somewhat stouter species, has 3-121110 and 11+15=26.
Leptophilypnion pusillus, holotype, 9.1 mm female. Dots on head, body, and fins represent melanophores. Branching of dorsal, anal, and particularly pectoral fin rays may not be reliable. Drawing by T. R. Roberts.
Sara Ahmadi, Mojgan Khodadadi, Ammar Salehi Farsani, Bahareh Samadi Kuchaksaraei and Hamed Mousavi-Sabet: Morphological development and growth of Bunni, Mesopotamichthys sharpeyi (Günther, 1874), larvae reared in the laboratory, pp. 99-108
The early development of the endemic cyprinid, Bunni Mesopotamichthys sharpeyi (Günther, 1874) larvae has been determined according to morphological changes and total length, standard length, head length, thickness of larvae, eye diameter and snout length measurements. The results showed that the initial period of Bunni larval life can be divided into two phases: early stages dependent upon endogenous nutrient sources, and a second phase of stages dependent upon exogenous food sources. In the first three days of larvae development there was a gradual yolk sac reduction after which there was a switch to exogenous feeding. From the fourth to eleventh day, the final development of heart, gill, air bladder, fins and intestine were observed. The newly hatched larvae and the fifteen day old larvae were 6.26±0.14 and 8.35±0.17 mm in mean total length (TL), respectively. The mouth opened 2-4 days after hatching (DAH). The larvae started to swim actively within 2-3 days and the yolk sac had been totally absorbed at 4-5 DAH. Notochord flexion began at 11 DAH. Compare to other cyprinids, the larval development of Mesopotamichthys sharpeyi is similar to other Mesopotamichthys species.
Figs 1A-J. Development stages of Bunni larvae: A) Newly hatched larvae; big yolk sac; B) One day after hatching (DAH); Appearance of heart; C) 2 DAH; Straight notochord;
D) 4 DAH; Opening of mouth;….