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Articles by P. Kochanian
Total Records ( 8 ) for P. Kochanian
  A. Shakouri , M.B. Nabavi , P. Kochanian , A. Savari , A. Safahieh and T. Aminrad
  Although, sea cucumbers are well known animals in Eastern Asia, in Iran they are not popular marine animals. Divers recorded these animals in their dives but this is the first scientific approach in identification of holoturians in Southeast coast of Iran. All sea cucumbers were collected with SCUBA diving and species identification was done through morphological keys and review of their dermal ossicles. There are two species of sea cucumber belong to genus Holothuria were collected on subtidal zone of Chabahar Bay in the late of 2007. This is the first report of H. hilla, H. parva from Chabahar Bay (North of Oman Sea). This study is revealed the special characteristics of the presented species in order to just identification of them. In the studied areas, H. parva has known as a rare species.
  A. Shakouri , T. Aminrad , M.B. Nabavi , P. Kochanian , A. Savari and A. Safahiye
  Three species of sea cucumber (2 species belong to genus Holothuria and one species of Stichopus) were collected on subtidal zone of Chabahar Bay in the late of 2007. The literature review on the distribution was revealed that this is the first report of H. leucospilota, H. arenicula and S.variegatus from Chabahar Bay (Sea of Oman). The species identification was done through morphological keys and review of their ossicles. This study is revealed the special characteristics of the presented species in order to just identification of them.
  H. Valavi , A. Savari , V. Yavari , P. Kochanian , A. Safahieh and O. Sedighi
  Potential and efficiency of coral reef bio-indicators proposed by reef check for coral reef monitoring in the Persian Gulf were studied as anthropogenic impact bio-indicators. Data were collected from the coral reefs in the Northern part of the Persian Gulf in 2007 using Reef Cheek standard methodology and analyzed using Redundancy Analysis and Indicator Species Analysis. Similar data collected in 2002 and 2003 were also incorporated into our data. According to the results short-spine sea urchin (Echinometra mathaei) showed consistent positive correlation with commercial fishing and high indicator value for commercial fishing areas and could be pointed out as a weak bio-indicator of over-fishing, also Arabian butterfly fish (Chaetodon melapterus), showed negative correlation with commercial fishing and high significant indicator values for none to low fishing areas in 2003 and 2007 and could be considered as indicator of low fishing pressure in the region. None of finfishes proposed as indicators of over-fishing and also other proposed species showed consistent correlation or consistent significant indicator values for any anthropogenic impacts and are not recognized as anthropogenic impact bio-indicators. It is concluded that a much shorter and more efficient list of bio-indicators could be used for monitoring anthropogenic impacts on coral reefs in this region.
  A. Hosseini , P. Kochanian , J. Marammazi , V. Yavari , A. Savari and M.A. Salari-Aliabadi
  Length-weight relationship and spawning season of Pickhandle barracuda, Sphyraena jello (C.) were studied for one year in Boushehr waters of the Persian Gulf. In the present study, 311 specimens were collected during November 2006 to October 2007. The samples composed of 151 (48.55%) male, 160 (51.45%) female; the sex ratio was M: F = 1: 1.06. The b value ranged between 2.77 to 2.87 for male and female fishes, respectively. The relationship between body weight and length in total specimens was 2.82, indicating that this species show negative allometric growth. The peak spawning season of these fishes occur around spring, from April to June. The lowest Gonadosomatic Index recorded in August. The present study is the first record on length-weight relationship and spawning season of this species in the Persian Gulf region.
  B. Doustshenas , A. Savari , S.M.B. Nabavi , P. Kochanian and M. Sadrinasab
  In this study, the Chesapeake Bay Benthic Index of Biotic Integrity (B-IBI) was selected in an attempt to describe ecological health of soft bottom channels (Khowr-e Musa) in North of the Persian Gulf. Most of study area was found to be in degraded or severely degraded conditions. B-IBI scores were ranged between 1 and 3.86. Comparison of macrobenthos abundance and organic content between two developmental periods showed significant difference (p<0.05). After the establishment and development of petrochemical industries, the abundance of macrofauna decreased (809 to 239 individuals m-2) and organic content increased leading to organic enrichment (15.3 to 22.4%). Three new sources of organic matter were found to be important namely industrial waste, sewage and mangrove litter. After 1999 about 6 millions Avicennia marina tree were planted near petrochemical zone in the area. Study area changed rapidly in the last decade and region is under severely anthropogenic impacts. The present study showed that Khowr-e Musa is under both natural stress and anthropogenic impacts and two main impacts could be attributed to the organic enrichment and to the dredging. Choice of suitable management plans and metric controls could help to the salvage of the largest tidal channel complex in Persian Gulf.
  N. Sakhaie , A. Savari , P. Kochanian , S.M.B. Nabavi and J.G. Marammazy
  The present information is based on the study of the zoeal stages of Hexapus sexpes. A single ovigerous female of Hexapus sexpes was collected from the North West Persian Gulf (29°56'14"S,49°0288"W) in April 2009. Female was maintained in aquarium containing natural sea water at 25°C until the eggs hatched. The present study describes the zoeal stages of Hexapus sexpes. A complete description and illustration of larval features is provided and a comparison with closely related species (Spiroplax spiralis and Lambdophallus anfractus) showing known larval development is presented. The zoeal stages of H. sexpes are very similar to that of L. anfractus. The zoeal of two species, however, could separate by the number of setae on the maxillule and maxilla.
  P. Shokat , S.M.B. Nabavi , A. Savari and P. Kochanian
  The aim of present study was to examine the macro invertebrates as an assessment tool for characterization of the state of Bahrekan estuary in Persian Gulf, by using different biotic indices. An investigation on benthos was carried out during autumn 2008 to summer 2009 in the Bahrekan estuary (Persian Gulf). In order to identify and assess the benthic community structure, seasonal sampling was done from 21 stations with three replicates using van veen grab (./285 m2). The ecological indices, such as (AMBI, BI and Bentix), Shannon-Wiener index (H'), species richness (S) were applied to the available benthic species data, and evaluated comparatively. The grain size of sediments and total organic matter as essential factors in distribution and population diversity of macrobenthos communities were also analysed. According to the results, 17 groups of macrobenthos were identified. Out of 111 genus/species identified in this study, Gastropoda was the dominate group (79.8%), followed by Bivalvia (5.5%). Pyrgohydrobia sp. belonged to gastropoda was dominant in all of seasons. The results showed that all of the stations are characterized as muddy bottom and Bahrekan estuary are classified in slightly to moderate pollution status.
  H. Valavi , A. Savari , V. Yavari , P. Kochanian , A. Safahieh and O. Sedighi
  The purpose of this study was to determine efficiency of coral reef indicators proposed by Reef Check for the Persian Gulf. Data were collected in the Northern part of the Persian Gulf, using Reef Cheek standard methodology, statistical analyses carried out were spearman correlation, redundancy analysis and indicator species analysis. According to the results of this study: (1) dark butterfly fish (Chaetodon nigropunctatus), Arabian butterfly fish (Chaetodon melapterus) and total butterfly fish (sum of both species) show consistent positive correlation with live coral and negative correlation with macroalgae coverage and have high, consistent and significant indicator values for high coral/low macroalgae habitats and are good indicators of healthy reefs in the region, (2) parrotfish >20 cm (sum of all species) show consistent positive correlation with live coral and negative correlation with macroalgae cover but don’t show high significant and consistent indicator value for high coral/low macroalgae habitats and are considered as weak bio-indicators for healthy reefs in the areas and (3) none of invertebrate species show consistent significant correlation with substrate types (live coral and macroalgae) or high consistent and significant indicator values for habitat types and therefore they can’t be used as reef health indicator in the region. It is concluded that only above-mentioned butterfly fish and to lower extent parrot fish can be pointed out as reef health indicators and efficiency of other fishes and invertebrates proposed by Reef Check, need to be revised as indicator of harvest types and other anthropogenic impacts in the region.
 
 
 
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