scholarly journals Otolith measurements to estimate standard length of gobiid fish (Teleostei: Gobiiformes) from the Persian Gulf and Oman Sea

2020 ◽  
Vol 67 (4) ◽  
Author(s):  
Mahdi Iranmanesh ◽  
Majid Askari Hesni ◽  
Mohammadreza Lashkari
Keyword(s):  
Standard Length ◽  
Persian Gulf ◽  
Regression Equations ◽  
Gobiid Fish ◽  
Morphometric Characters ◽  
Oman Sea ◽  
Significant Difference ◽  
The Persian Gulf ◽  
Periophthalmus Waltoni ◽  
The Relationship

The relationship between morphometric characters (length, weight and height) of otolith and fish standard length was determined for six intertidal gobiid species from the northern Persian Gulf and Oman Sea. A total of 144 sagittal otoliths were extracted and anlysed from Periophthalmus waltoni, Boleophthalmus dussumieri, Scartelaos tenuis, Istigobius ornatus, Bathygobius meggitti and Trypauchen vagina. Regression equations were derived and found that there is no significant difference in regression coefficients between left and right otoliths of the species studied. Results of the study showed that otolith length (OL) and height (OH) could estimate standard length in all the species studied except in T. vagina, where the otolith weight gave the best estimate of standard length. Results clearly indicated that otolith dimensions of the gobiid fishes studied could provide information about the species and size.

Morphometric differentiation among populations of Leptodius exaratus (H. Milne Edwards, 1834) (Brachyura, Xanthidae) from the Persian Gulf and the Gulf of Oman

Crustaceana ◽  
2016 ◽  
Vol 89 (3) ◽  
pp. 259-271 ◽  
Author(s):  
Mehrnaz Afkhami ◽  
Christoph D. Schubart ◽  
Reza Naderloo
Keyword(s):  
Persian Gulf ◽  
Multivariate Analyses ◽  
Morphometric Characters ◽  
Gulf Of Oman ◽  
Animal Populations ◽  
Significant Difference ◽  
Males And Females ◽  
The Persian Gulf ◽  
Parametric Analyses ◽  
Low Rate

The marine environment of the Persian Gulf is characterized by extreme biophysical factors, like high salinities. This gulf is a semi-enclosed basin and is connected to the Gulf of Oman via the narrow Strait of Hormuz that may act as a barrier to gene flow between the two gulfs. Consequently, animal populations living in the Persian Gulf are hypothesized to be isolated and thus to evolve independently from neighbouring populations. We tested this hypothesis with the xanthid crab,Leptodius exaratus(H. Milne Edwards, 1834), which is one of the most common intertidal crabs occurring in the Persian Gulf and the Gulf of Oman. Four-hundred-and-fifty specimens were collected from eight sampling sites, i.e., four sites each in the Persian Gulf and the Gulf of Oman. Fifteen morphometric characters were measured. Males and females were analysed separately to avoid bias as a consequence of sexual dimorphism. Due to the lack of normal distribution in males, two different approaches were carried out in this paper. Female specimens were included in parametric analyses, while males were tested with permutational multivariate analyses of variance. In female morphometric characters,t-test analyses showed significant differences between the two sets of populations, and the discriminant analysis showed divergence between the two groups (with 83% correct groupings). In the males, the applied analyses showed a significant difference () between the two gulfs. These divergences can be interpreted as a consequence of regional adaptations and a low rate of larval migration between the two gulfs.

New species of Silhouettea (Teleostei: Gobiidae) from Qeshm Island, Iran and the DNA barcoding of the Persian Gulf and Oman Sea gobies

Zootaxa ◽  
2020 ◽  
Vol 4750 (1) ◽  
pp. 49-66
Author(s):  
MARCELO KOVAČIĆ ◽  
REZA SADEGHI ◽  
HAMID REZA ESMAEILI
Keyword(s):  
New Species ◽  
Dna Barcoding ◽  
Standard Length ◽  
Persian Gulf ◽  
Head Width ◽  
Qeshm Island ◽  
Dorsal Fin ◽  
Oman Sea ◽  
Mtdna Coi ◽  
The Persian Gulf

Silhouettea ghazalae sp. nov. is described from Qeshm Island, Persian Gulf. Silhouettea ghazalae sp. nov. is distinguished from congeners by having: small mental fold present on chin, head length 31.4–32.4% of standard length, head width 24.5% of standard length, second dorsal fin I/11, anal fin I/13, breast with large cycloid scales, predorsal area naked, suborbital row b anteriorly beginning below anterior edge of pupil, posteriorly ending below pore β, suborbital row c anteriorly extending more than row b and posteriorly extending less than row b, suborbital row cp oblique with four papillae, body with four ill-defined midlateral blotches and the fifth a triangular mark on the caudal fin base, no clearly defined pale saddles on back, and the first dorsal fin pigmented with dots and with dark blotch present anteriorly. A key to Silhouettea species is provided. A dataset including novel and publicly available mtDNA COI sequences of 12 species from the Persian Gulf and Oman Sea gobies belonging to eight genera have been assembled in order to provide a reference dataset for DNA barcoding studies. The new species is further characterised by a minimum K2P distance of 21% to its closest relatives in our dataset, Cabillus tongarevae in the mtDNA COI barcode region. 

scholarly journals The structure of the Persian Gulf outflow subjected to density variations

2008 ◽  
Vol 5 (2) ◽  
pp. 135-161 ◽  
Author(s):  
A. A. Bidokhti ◽  
M. Ezam
Keyword(s):  
Mass Transport ◽  
Persian Gulf ◽  
Anthropogenic Factors ◽  
Oman Sea ◽  
The Earth ◽  
Salinity Increase ◽  
Persian Gulf Water ◽  
Oceanographic Data ◽  
The Persian Gulf ◽  
Simple Dynamical Model

Abstract. Oceanographic data and a dynamic model are used to consider the structure of Persian Gulf outflow. This outflow influences the physical properties of Oman seawater which appear in the CTD profiles of the Oman Sea. The observations show that thickness of the outflow, which is banked against the Oman coasts due to the earth rotation, is about 200 m with tongues extending east and north that may be due to the internal waves. A simple dynamical model of the outflow based on potential vorticity conservation is used to find the horizontal extension of the outflow from the coast. Typical mass transport estimate by the outflow is about 0.4 Sv, which is larger than those reported by others. This may be due to the fact the model is inviscid but the outflow is influenced by the bottom friction. Variability of the outflow structure may reflect the changing ecosystem of the Persian Gulf. Any change of the outflow source, the Persian Gulf Water (PGW), say salinity increase due to excessive evaporation (climate factor) or desalination (anthropogenic factors) of the PGW may change the outflow structure and the product waters in the Oman Sea. Hence, one can test different scenarios of changing the outflow source, the Persian Gulf Water (PGW), say by salinity increase due to excessive evaporation or desalination (ecosystem factors) of the PGW to estimate changes in the outflow structure and the product waters in the Oman Sea. The results of the model show that these can increase the outflow width and mass transport substantially.

Morphometric and genetic characterizations of blue swimming crab Portunus segnis, (Forskal, 1775) along the Iranian coasts of the Persian Gulf and Oman Sea

2020 ◽  
Vol 34 ◽  
pp. 101091
Author(s):  
Dara Bagheri ◽  
Ahmad Farhadi ◽  
Afshar Bargahi ◽  
Iraj Nabipour ◽  
Seyyedeh Roya Alavi Sharif ◽  
...  
Keyword(s):  
Persian Gulf ◽  
Swimming Crab ◽  
Oman Sea ◽  
The Persian Gulf ◽  
Portunus Segnis

Morphological identification and molecular validation of anchovies (Engraulidae) in the Persian Gulf and Oman Sea

Zootaxa ◽  
2020 ◽  
Vol 4742 (2) ◽  
pp. 375-391
Author(s):  
MAHBOOBEH AFRAND ◽  
IMAN SOURINEJAD ◽  
SEYED ABOLHASSAN SHAHZADEH FAZELI ◽  
ARASH AKBARZADEH ◽  
LALEH PARSA YEGANEH ◽  
...  
Keyword(s):  
Persian Gulf ◽  
Morphological Characteristics ◽  
Morphological Differentiation ◽  
Genetic Distances ◽  
Morphological Identification ◽  
Mitochondrial Cytochrome Oxidase Subunit ◽  
Closely Related Species ◽  
Oman Sea ◽  
The Persian Gulf ◽  
Mitochondrial Cytochrome Oxidase

Validation of species using independent lines of evidence is sometimes desirable when their identification using only one approach is difficult or questionable. The identification of anchovies (Engraulidae) are often challenging based on morphology because closely related species exhibit only slight morphological differentiation. This study utilized morphological characteristics and DNA barcodes for identification and validation of anchovies in the Persian Gulf and Oman Sea. Based on morphology, we identified eight species: Thryssa hamiltonii, T. setirostris, T. vitrirostris, T. whiteheadi, T. dussumieri, Encrasicholina punctifer, E. pseudoheteroloba and Stolephorus indicus. A 658 bp region of mitochondrial cytochrome oxidase subunit I (COI) was generated for 53 specimens from these eight species. From these sequences, we built a Maximum Likelihood phylogenetic tree. In this tree, each species forms a monophyletic group confirming our initial morphological identification. In addition, we provided (and registered in GenBank) the first barcode sequences for T. whiteheadi, an endemic species of this region. Interspecies genetic distances were comprised between 0.168 to 0.275. The largest genetic distance was found between T. vitrirostris and S. indicus and the smallest between T. dussumieri and T. whiteheadi. This study successfully identified eight species of anchovies in the Persian Gulf and Oman Sea based on both morphological and molecular characters. 

Sign in / Sign up

Export Citation Format

Share Document