Showing 6 results for Alavi-Yeganeh
Mohammad Sadegh Alavi-Yeganeh, Bahram Falahatkar,
Volume 2, Issue 3 (12-2013)
Abstract
Length-weight relationship, age range and fecundity of 40 specimens of the Russian sturgeon, Acipenser gueldenstaedtii, collected from two fishing stations in the southeastern Caspian Sea, were determined. Average length (TL) and weight were 129.5 cm and 12.7 kg for males and 145.8 cm and 22.15 kg for females, respectively. Absolute fecundity was 184000 in average and condition factor calculated 0/58 and 0/7 for male and females, respectively. Average age for males and females was 12.7 and 14.6 years, respectively. All these factors were lower than previous records from the Volga river estuary. Length-weight relationships results demonstrated isometric growth pattern with average slope of 2.978 and 2.822 for males and females respectively. These values were not statistically different between sexes (p> 0.05), but using this relationships for each sex separately will be useful for more reliable results especially in broodstock studies.
Mohammad Alavi-Yeganeh, Bahram Falahatkar,
Volume 3, Issue 1 (6-2014)
Abstract
Length-weight relationships and fecundity of 93 individual female Acipenser persicus broodstocks were investigated. The specimens were caught during 2001-2005 from Golestan, Mazandaran and Guilan provinces along the southern coast of the Caspian Sea. Total length and weight of each fish was measured to the nearest 1cm and 100 g, respectively. Age determination was carried out by using transects of the first ray of pectoral fin. The absolute fecundity was assessed by egg count per weight unit of all eggs existed in the body. The specimens were from 13 to 20 years old, of which the 16 years old had the highest proportion with 23.7%. Range of total length and weight were 132.5 to 211 cm and 14 to 42 kg, respectively. Mean absolute fecundity was estimated 267810 ± 92570. Total length, weight and absolute fecundity of fish increased with age in all cases, showed a significant positive correlation (p <0.01). The slope of the length-weight relationship (b) was equal to 2.745 and isometric growth pattern was determined in this species.
Somayeh Razavi, Mohammad Alavi-Yeganeh, Rahim Peyghan,
Volume 5, Issue 4 (3-2017)
Abstract
In the present investigation, infection of Lernaeacruciata parasite is reported in Farsi toothcarp (Aphaniusfarsicus) collected from Maharlu Lake basin in 2014. The prevalence of infection appeared 88.9% (45 specimens). Lernaeacruciataparasites were isolated from origin of fins, gill opercels and body surface. Frequency of parasite on each fish appeared 1 or 2 which mostly attached to branch and under operculum (45%) and base of pectoral and anal fins (43%). The L. cruciata may have been translocated into the Maharloulake Basin by an exotic Poecilid; Gambusiaholbrooki. Sever infection of this endangered endemic fish species warns that urgent reactions should be taken for conservation of Farsi tooth carps in area.
Ghazaleh Bahmani, Mohammad Alavi-Yeganeh, Seyed Jafar Seyfabadi, Parviz Tavakoli-Kolor,
Volume 6, Issue 1 (6-2017)
Abstract
Settlement of benthic community depends on environmental conditions and interspecific reactions. The effect of substrates on the surface cover by the soft coral, Zoanthus sansibaricus, and the brown algae, Iyengaria stellata and their computational condition, was compared in the Hormuz Island by estimating of coverage area in 40 quadrates (50×50 cm). Z. sansibaricus is a dominant soft coarl (Zoanthid) species in Hormuz island coasts in the other side I. stellata considered as dominant macroalgea, most of year in area. Significant negative correlation (p<0.01; r = -0.607) revealed competition between two species in settlement on the two substrates. Soft coral with 61.7% coverage was dominant vs. 16.8% for brown algae on muddy-Rubble substrate, but on sandy-Rubble substrate, the brown algae was dominant with 37.8% coverage vs. 19.5% for the soft coral. It seems that better compitiunal conditions in settlement on unconsolidated substrate have some advantages for Z. sansibaricus on Muddy-rubble substrate.
S. Kouhee, M.s. Alavi-Yeganeh , J. Ghasemzadeh,
Volume 7, Issue 3 (Summer 2018)
Abstract
Golden grey mullet (Liza aurata) and leaping mullet (Liza saliens) are two species from Mugilidae which inhabit the Caspian Sea. Despite the difference in the number of Pyloric caeca, lateral line scale, and gill rakers, diagnosis between two species regarding morphological plasticity is relatively difficult. In this experimental study, in addition to access previous morphological diagnostic characters, 31 morphometric and 10 meristic characters were surveyed. Also, COI gene sequence used to confirm accurate identification of these two commercial species in the Caspian Sea. In this way 25 samples were used for biometry. Samples were collected from Nur and Anzali cities beach sein fishing center in autumn and winter 2016. Among surveyed morphological characters, 3 meristic and 15 morphometric characters revealed a significant difference (p<0.05), respectively. Regarding the principal component analysis (PCA) results, Pre-pectoral fin length, Pelvic fin length, Anal fin base length, Caudal peduncle width, Anal fin height and Head width, within Morphometric characters and Second dorsal fin rays, lateral line scale number, number of Gill rackers and Pyloric caeca were among meristic characters which reveals highest load factor (>0.7) in discrimination of two species specimens. Regarding genetic distances, the between-group distance estimated 40bp (6.8%) or 0.078 K2P that well agreed with morphological identification. Results revealed the application of more morphological characters in the diagnosis of two Mullet species in the Caspian sea which could be useful in completing identification keys.
Volume 10, Issue 1 (Winter 2022)
Abstract
Aim Molecular phylogenetic relationship and morphological characteristics of the reef margin blenny,
Entomacrodus striatus was undertaken in order to clarify its taxonomic status in the Iranian coasts of the Gulf of Oman.
Entomacrodus striatus is distributed in the Indo-Pacific realm.
Materials and Methods This study is based on four samples taken from Chabahar in the northern Gulf of Oman, during February 2019.
The mt-DNA marker (COI) of one
E. striatus from the present study and 15
Entomacrodus species was used for reverification over traditional morpho-taxonomy.
Findings Bayesian Inference (BI) and Maximum Likelihood (ML) approaches result in five clades including, clade A (
Entomacrodus corneliae,
E. chiostictus, E. nigricans, E. sealei, E. cymatobiotus, E. caudofasciatus), clade B (
E. striatus, E. niuafoouensis, E. epalzeocheilos, E. randalli), clade C (
E. macrospilus, E. thalassinus), clade D (
E. vermiculatus, E. decussatus), and clade E (
E. stellifer). The morphological characters of the examined materials were in the range of its original description, except in having a pair of pores in one position of the preopercular series of sensory pores, which may be hypothesized a population variation associated with geographical distribution. The sexual dimorphism is distinguishable especially in color pattern of specimens which the blotches and bands on the male bodies are more bolded than the female ones.
Conclusion The inferred ML and BI trees resulted a homological clustering of taxa that are grouped according to their morphological characteristics and were agree with molecular reconstructions based on nuclear markers.
