فهرست مطالب mohammad sadegh alavi yeganeh

The relationships between sagittal otolith dimensions and fish sizes are estimated for Silver Sillago (Sillago sihama) from the Persian Gulf. Three dimensions of the otolith (length, width and weight) were shown to be suitable factors for prediction of the length and weight of fish in this species based on calculated coefficients of determination values in linear and exponential regression relationships (r2>0.76). There were no significant variations observed between the sizes of the left and right otoliths. The provided data will be useful for estimating fish size based on remnant otoliths in related studies in the Persian Gulf.

The present study was carried out to determine and compare proximate composition and minerals (K, Na, Ca and P) in the edible tissue of Sillaginid species, including Sillago arabica, Sillago chondropus, Sillago indica and Sillago sihama in the southern waters of Iran. The fish species were collected from two stations in Persian Gulf (Bushehr and Hormuz Island) and one station in the Oman Sea (Chabahar) during a period from December to March 2020. Moisture, fats, ash and protein content were determined using AOAC standard method and the amount of minerals was measured using ICP-MS. The average moisture content was (70.3 ± 1.9 to 79.7 ± 1.3%), protein was (14.1 ± 2.1 to 21.9 ± 1.3%), fat was (1.5 ± 0.3to 3.9 ± 0.1%) and ash was (3.4 ± 0.8 to 4.5 ± 0.9%). The highest amount of elements was obtained for phosphorus (1060.4 ± 180.3-1693.2 ± 162.3) and then potassium (597.5 ± 82.3-1153.1 ± 137.6). This study showed that all four species of Sillaginid species in our country's waters are rich in protein with a protein content of more than 15%. All the fish analyzed for fat were lean with fat contents less than 0.5%. The Na/K ratio values, which was calculated less than 1 in all four species. The results of this study confirmed Sillaginid species as a valuable nutritional source with suitable protein and minerals content.

First record of the Triplefin fish (Blenniiformes: Tripterygiidae), Helcogramma ellioti, is reported here based on six specimens collected from Chabahar, northern Gulf of Oman in February 2019. Identification was confirmed based on a series of morphological characters including, a minute supraorbital tentacle, 3-5 symphyseal mandibular pores, a numerous number of scales in lateral line (36-37) and a low number of total lateral scale rows (38-39). Specimens were found in coral reef areas at depths of 1-15 m of the Gulf of Oman in the Indo-Pacific region. Compared to the other members of Helcogramma, H. ellioti is regarded as a medium to large body size species (25.0-57.0mm SL). Although several species of triplefin fishes have been reported from the Persian Gulf, but, it is the first record from Tripterygiidae for the Iranian waters of the Gulf of Oman

Mullets are among commercial species with good marketing condition which inhabit southern and northern coastal waters of Iran. Understanding of the diversity of mullets is a vital for their conservation. In this study, morphological characters of scale in ten mullet species from Iran are investigated. Specimens were collected from southern and two northern provinces of Iran during two years. Identification verified by reliable available identification keys. Minimum 5 scales were collected from left side of each specimen then photographed by stereomicroscope after rinsing. Results revealed that scales in different ten mullet species are distinguishable base on morphometric and meristic characters including General shape, number of Radii on scale, position of focus, Ctenii and Interradial tongue-like projection shape, scale area, scale length, scale width and distance between focus and up or low margin of scale. Among diagnostic characters, Two species of the Caspian Sea; Chelon aurata and Chelon saliens revealed significant smaller scale area and length (p≤0.05) while significant bigger scale length (p≤0.05) appeared in Ellochelon vaigiensis, Planiliza macrolepis and Planiliza subviridis .

Knowledge on the fish species is important in habitat protection management. This study was conducted to compare the morphological characteristics of two populations of Rhinogobius similis from Hariroud basin based on landmark morphometric truss network system. A total of 60 individuals from Polkhatoun (30 specimens) and Tafrihgah dam (30 specimens) stations were caught by electrofishing 220 volts. 15 landmarks set were selected and 105 distances were measured between the landmarks on the left side of each specimen. Then principal components analysis and discriminate function analysis were applied to identify influential truss variables to differentiate between the two populations. Based on principal components analysis results, there were 15 principal factors in morphometric characters. The linear discriminant analysis gave an average percentage of specimens classified of 100% for morphometric characters indicating a high rate of correct classification of individuals into their original populations. These populations are distinguished especially by head shape, eye diameter, and pre-dorsal, pre-pelvic and pre-anal distances.

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

In the present investigation, infection of Lernaea cruciata parasite is reported in
Farsi toothcarp (Aphanius farsicus) collected from Maharlu Lake basin in 2014. The
prevalence of infection appeared 88.9% (45 specimens). Lernaea cruciate parasites
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;
Gambusia holbrooki. Sever infection of this endangered endemic fish species warns
that urgent reactions should be taken for conservation of Farsi tooth carps in area.

We used 50 specimens of Alosa braschnikowi (A. brschnikowi) to study the growth effect on Gill raker morphology. Gill rakers counted as 26-47 which increased in relation to increase in TL (P

Esox lucius Linnaeus1758 is one of the economically valuable species of Caspian Sea. Genetic diversity of marine resources is of vital importance in their management and protection. Considering the lack of information about genetic differences this species; seven microsatellite loci were used for 90 sample analyses. The results showed conspicuous genetic variation in regions using Fst, AMOVA and a relatively high level of gene flow was found among populations. The average observed and expected heterozygosities were 0.383 and 0.622, respectively. Assessment of Hardy-Weinberg equilibrium showed that all samples of studied tests were significantly deviated from H-W equilibrium (p ≤ 0.05). Results show evidences for genetic bottleneck in the populations. Graphical cluster represents a distinct molecular variance test, there are three distinct and separate population in the three areas that should be considered in the management of these reserves.

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

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.

Genomic DNA extraction with high quantity and quality is one of the basic necessities of molecular genetic studies. Therefore، nowadays، various methods for extracting DNA from different organisms and tissues are used. Non destructive and non-lethal sampling methods are preferred for conservation reasons. This study introduces an optimal method for extracting DNA from two non-lethal sample tissues of the pike through comparing three methods of phenol - chloroform، saturated NaCl، and ammonium acetate. Ninety samples of the pike fins and scales were collected from Gilan and Mazandaran. Nanodrop and electrophoresis on 1 % agarose gel were used for evaluating the quality and quantity of extracted DNA samples. Also amplification ability of the DNA was assessed with microsatellite markers using the ELU19 primer. Based on the results، the best efficiency، if the DNA concentration was important، was achieved by the phenol - chloroform method and the fin tissue. The saturated salt method from the fin or scale tissues showed higher efficiency if the DNA concentration was less important. According to the results of PCR-SSCP، amplified bands were 150bp. DNA samples of the fin tissue using phenol – chloroform and saturated salt methods showed sharper bands in comparison with the scale tissues in all three methods. So، the saturated salt method seems to be a suitable method for DNA extraction from pike tissues because it uses less toxic materials and is inexpensive.