| 2. |
- Naddafi, Rahmat
(författare)
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Application of stable isotopes of carbon (13δC) and nitrogen (15δN) in assessment of Gorgan Bay fish dynamic in Golestan province
- 2021
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Ingår i: Journal of Applied Ichthyological Research. - 2423-6349. ; 8, s. 46-53
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Gorgan Bay and the southeastern coasts of the Caspian Sea in the Golestan Province are important biological and fisheries areas, while in recent years, they have been heavily contaminated. In present study, the dynamic of fishes, using stable nitrogen and carbon isotopes was evaluated to determine the diet and its trophic status, which can accurately chart the ecosystem's biological conditions. Accordingly, in September-October 2015 at 5 ecological stations, sampling of prephytones, macrophytes, macro invertebrates and fish, were taken and dominant species were subjected to isotope analyzes using the EA-IRMS device. The results of the nitrogen15 and carbon-13 isotopes indicate an imbalance in ecosystem conditions that alters the diet of the organisms and reduces the efficiency of the food web. The main factors of pressure on the ecosystem, the closure of the main channels of the sea to the bay, the entry of various pollutants into the ecosystem and weak physiography of Gorgan Bay, were determined.
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| 3. |
- Naddafi, Rahmat
(författare)
-
Composition of fish larvae in the central creeks of Bushehr province, Persian Gulf in 2013-2014
- 2015
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Ingår i: Journal of Applied Ichthyological Research. - 2423-6349. ; 3, s. 1-18
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Tidskriftsartikel (refereegranskat)abstract
- This study was carried out to identify the taxonomic composition of fish larvae collected bimonthly in waters of Bushehr to Genaveh in six stations (Five creeks: Shif, Lashkari, Ramleh, Farakeh, Dubbeh, and one station in the seashore) in norhtern Persian Gulf, Iran, from June 2013 to April 2014. Fish larvae were sampled usinga Bongo-net (diameter, 60 cm; mesh size, 300 µm).A total of 21440 fish larvae representing 30 families (which included two subfamilies, eightgenuses, nine species and eight types), one group to the levels of order and two types were recognised. The identified taxa were: Apogonidae, Blenniidae, Callionymidae, Carangidae, Clupeidae, Cynoglossidae, Diodontidae, Engraulidae, Gerreidae, Gobiidae, Haemulidae, Hemiramphidae, Leiognathidae, Mugilidae, Mullidae, Nemipteridae, Pegasidae, Platycephalidae, Scatophagidae, Sciaenidae, Scombridae, Sillaginidae, Soleidae, Sparidae, Sphyraenidae, Synanceidae, Syngnathidae, Terapontidae, Triacanthidae, Tripterygiidae, and Tetraodontiformes. Among them, Soledae (including 6 types) and Gobiidae (including 3 types) were the most diverse families. What is more,Pegasus volitans(Pegasidae),Cyclichthys orbicularis(Diodontidae),Trachurus indicus(Carangidae), andHippichthys penicillus(Syngnathidae) were reported for the first time in Iranian waters.
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| 5. |
- Naddafi, Rahmat
(författare)
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Species identification of Sillaginid larvae (Perciformes: Sillaginidae) in the central creeks of Bushehr province – Persian Gulf using morphological and DNA barcoding methods
- 2016
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Ingår i: Iranian scientific fisheries journal. - 2322-5998. ; 25, s. 1-9
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Sillaginids are one of the important fishes in coastal waters of Persian Gulf, whose larvae of different species are morphologically very similar to each other and identification of them to species level is very difficult. In this study a total of 4195 Sillaginidae larvae were collected from five inlets (Shif, Lashkari, Ramleh, Dubbeh, Farakeh) and one sampling site in the coastal area of Bushehr Province using a Bongo-net. Morphological and genetic methods were used to identity larvae of this family. The larvae were morphologically divided into two groups, depending on 34 or 38 myomers. The larvae with 34 myomeres were identified asSillagosihama. To identify larvae with 38 myomers, 12 individuals of postflexion larvae were selected and the morphological characteristic such as number of dorsal and anal fins as well as DNA barcoding of COI were used. According to morphological characteristics, the larvae were divided into two species;SillagoarabicaandSillagoattenuata. Genetic studies was done by sequencing of 625 base pair of COI gene. Genetic distances calculated using K2P model between these two species was 18% to 19.7% which indicate that DNA barcoding confirms morphological method and it can be used for identifying younger larvae whose fin rays have not been developed and are unidentifiable with morphological methods
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