Tuesday, September 16, 2014
   
Text Size

Volume 15, Issue 4, 15 October 2009

John E. Randall and Jennifer K. Schultz: Pictichromis dinar, a new dottyback (Perciformes: Pseudochromidae) from Indonesia, pp. 169-176

Abstract           

A new pseudochromid fish species, Pictichromis dinar, is described from five specimens from the western side of the Gulf of Tomini, Sulawesi, Indonesia, where it occurred on a drop-off in 15 to 25 m. It is bright purple anteriorly and abruptly bright yellow posteriorly in life, hence remarkably similar to P. paccagnellae (range from Bali and Sulawesi to Vanuatu), and to P. coralensis (range from Queensland to New Caledonia). The demarcation of purple and yellow is generally more anterior and more slanting in P. dinar. The caudal fin of P. paccagnellae and P. coralensis varies from slightly rounded to slightly emarginate, compared to distinctly emarginate in P. dinar, the caudal concavity is 9.9-11.2% SL. Also, P. dinar has modally one more gill raker. Thirty specimens of Pictichromis dinar and 28 of Pictichromis paccagnellae were assessed at 628 base pairs of the mitochondrial cytochrome c oxidase I gene. No haplotypes are shared between the species, and within species sequence divergence (d = 0.003) is an order of magnitude lower than sequence divergence between the two species d = 0.06). This is consistent with reproductive isolation and species-level designation.

Full Text | PDF (212 KB)

Pictichromis-540

 

 

Holotype of Pictichromis dinar, BPBM 40976, 42.0 mm, Indonesia, Sulawesi, Gulf of Tomini. Aquarium photo by Scott W. Michael.

 

 

 

 


John E. Randall: A review of the gobiid fishes of Easter Island, with description of a new species, pp. 177-190

Abstract

Only 129 species of fishes are known for Easter Island from the shore to a depth of 200 m. Six of these are gobies: Gnatholepis pascuensis, first considered as a new subspecies of G. cauerensis, here given species rank; Kelloggella disalvoi, a new species from the highest tide pools, previously identified as the Hawaiian K. oligolepis; the endemic Pascua caudilinea, a common species from tide pools to at least 40 m, never seen while diving; Priolepis psygomophilia, also cryptic, with the same unusual depth range for a goby, described from two small specimens from the Kermadec Islands and regarded as the same species at Rapa and Easter Island; Priolepis squamogena, conspicuously marked with dark-edged brown bars, described from French Polynesia and the Line Islands, and reported here as a first record for Easter Island from two juvenile specimens; and Trimma unisquamis, a wide-ranging insular species represented by 25 specimens collected from depths of 16.5-40 m. A key is provided for the Easter Island species of Gobiidae.

Full Text | PDF (368 KB)

P.-caudilinea-540

 

Pascua caudilinea, male, BPBM 6745, 27 mm, Easter Island. Photo by J. E. Randall.

 

 

Shnoudy A. Bakhoum: Biometric characteristics and some biological features of natural hybrids between Nile tilapia Oreochromis niloticus and blue tilapia Oreochromis aureus in Lake Edku, Egypt, pp. 191-204

Abstract

Oreochromis niloticus, O. aureus and specimens with an external appearance intermediate between these putative parents were sampled from Lake Edku and examined to determine the hybrid nature of the intermediate specimens. The results of hybrid index, principal component analysis, discriminant function analysis and the Mann-Whitney U-test indicated the hybrid nature of these specimens and determined the most suitable biometric characters to distinguish different hybrid types from the parent species. Hybrid specimens represented about 28% of the total catch of Lake Edku. Hybrids have a higher percentage of males than females. Hybrids become mature at a smaller size and their reproductive activity is lower than that of the parent species. The natural mortality of hybrids is higher than that of the parent species.

Full Text | PDF (296 KB)

Oreochromis-540

 

 

Oreochromis niloticus. Photo by S. A. Bakhoum

 

 

José I. Castro: Observations on the reproductive cycles of some viviparous North American sharks, pp. 205-222

Abstract

The reproductive cycle of sharks is defined by how often a species breeds and consists of two periods: vitellogenesis and gestation. These two periods can run concurrently or consecutively, and the duration of each period is variable. Together, the periods of vitellogenesis and gestation determine the length of the reproductive cycle. The genera Rhizoprionodon, Mustelus, and some Sphyrna exhibit annual cycles with concurrent vitellogenesis and gestation, and thus, they produce one brood each year. Carcharias taurus females apparently have a biennial reproductive cycle with discontinuous ovulation. Alopias spp. exhibit an annual cycle with concurrent vitellogenesis and gestation, and have continuous ovulation. Squalus acanthias has a squaloid biennial cycle with concurrent vitellogenesis and gestation. Sharks of the genera Carcharhinus, some Sphyrna, and Ginglymostoma have a biennial cycle with consecutive vitellogenesis and gestation. Galeocerdo cuvier has a 12-month gestation period in the western Atlantic, its reproductive cycle may be biennial. Carcharhinus obscurus has an 18-month gestation period and probably a three-year reproductive cycle. The biennial cycle, with all its variations, is found in sharks of different phyletic origins such as carcharhinoid, squaloid, and orectoloboid sharks, reflecting their common physiological processes that require a long time to accumulate sufficient energy to produce a brood.

Full Text | PDF (540 KB)

Cycle-540

 

 

 

Rhizoprionodon terraenovae, gravid female carrying term young and ripe oocytes. Photo by J. I. Castro

 

 

 

Friedhelm Krupp, Uwe Zajonz, Maroof A. Khalaf: A new species of the deepwater cardinalfish genus Epigonus (Perciformes: Epigonidae) from the Gulf of Aqaba, Red Sea, pp. 223-227

Abstract

A new species of epigonid fish, Epigonus marisrubri, is described, based on two specimens (134 mm and 136 mm SL), which were collected over a reef area at a depth of 52 m at the northern tip of the Gulf of Aqaba, Red Sea, Jordan. The new species differs from its congeners by the following combination of characters: dorsal rays VII + I,10; anal rays II,9; pored lateral line scales 48 or 49; gill rakers 29 or 30; pyloric caeca 10; two pterygiophores between neural spines 9 and 10; pectoral fins long, reaching level of second dorsal-fin origin; tongue with a band of teeth on glossohyal; opercle with a short, poorly ossified spine and 1-2 spinelets; otolith (sagitta) oval, elongate, with smooth rims; sulcus and cristae weakly developed. This is the first record of the family Epigonidae from the Red Sea.

Full Text | PDF (128 KB)

Epigonus-540

 

 

Ethanol-preserved holotype of Epigonus marisrubri n. sp., SMF 24661. Photo by S. Tränkner

 

 

Move
-

List of articles

Top Headline

VOLUME 20, ISSUE 3 – 29 JUly 2014
A new Papiliolebias species (Teleostei: Cyprinodontiformes: Rivulidae) from Bolivian Amazon Stefano Valdesalici and Roger Brousseau aqua International Journal...

Read More...

Managing Editor

Heiko Bleher
Via G. Falcone 11,
27010 Miradolo Terme (PV), Italy
Tel. & Fax: +39-0382-754129
E-mail: heiko@aquapress-bleher.com
www.aqua-aquapress.com

New Scientific Editor

Flávio C. T. Lima
Museu de Zoologia da Universidade
Estadual de Campinas “Adão José Cardoso”
Rua Albert Einstein s/n, Caixa Postal 6109,
13083-863 Campinas, São Paulo, Brazil
Tel. +55 019-3521-6385

aqua International Journal

aqua is a fully peer-reviewed
scientific Journal published
every January, April, July and October
by Aquapress Publishers
Via G. Falcone 11
I-27010 Miradolo Terme (Pavia) ITALY
© aqua, International Journal of Ichthyology
ISSN 0945-9871

Social Bookmark

FacebookTwitterDeliciousStumbleuponGoogle BookmarksLinkedin

Aqua Shop

Product categories

Who's Online

We have 64 guests online

Users by Countries

Dimension: Country
Metric: Visits

loader

Claim policy

Orders are regarded as firm and are not refundable. Taking out an annual subscription commits you for a minimum of one year.

Subscription will be renewed automatically. If you have received a renewal invoice and do not wish to continue with the subscription, please submit the cancellation in writing within one month to:

e-mail: aqua@aquapress-bleher.it

Fax: 0039 0382754129

Reviews - Top

1. best site, best contents

Scope

aqua is an international journal which publishes original scientific articles in the fields of systematics, taxonomy, bio-geography, ethology, ecology, and general biology of fishes since 1994. Papers on freshwater, brackish, and marine fishes will be considered. aqua is fully refereed and aims at publishing manuscripts within 2-4 months of acceptance. In view of the importance of colour patterns in species identification and animal ethology, authors are encouraged to submit colour illustrations in addition to descriptions of coloration. It is our aim to provide the international scientific community with an efficiently published journal meeting high scientific and technical standards.

Call for Papers

The editors welcome the submission of original manuscripts which should be sent in digital format to the scientific editor. 
Full length research papers and short notes will be considered for publication. There are no page charges and colour illustrations will be published free of charge. Authors will receive one free copy of the issue in which their paper is published and an e-print in PDF format.

Member Login