Growth and reproduction of Solen dactylus (Bivalvia: Solenidae) on northern coast of the Persian Gulf (Iran)

2009 ◽  
Vol 89 (8) ◽  
pp. 1635-1642 ◽  
Author(s):  
Hanieh Saeedi ◽  
Shahrokh P. Raad ◽  
Aria A. Ardalan ◽  
Ehsan Kamrani ◽  
Bahram H. Kiabi
Keyword(s):  
Persian Gulf ◽  
Growth Parameters ◽  
Stage Iv ◽  
Gonadal Development ◽  
Northern Coast ◽  
Males And Females ◽  
Razor Clams ◽  
Bandar Abbas ◽  
The Persian Gulf ◽  
Growth And Reproduction

Solen dactylus is a razor clam distributed throughout the coast of the northern Persian Gulf. Study on biology of razor clams in this area is important for an essential management where these clams are overfished without any control. This study provides the first estimate of growth rate and an interpretation of the reproductive cycle of S. dactylus on the coast of the Persian Gulf (Bandar Abbas). In this study, 945 razor clams were collected from April 2007 to March 2008 along two transects of Golshahr coast in Bandar Abbas. Von Bertalanffy growth parameters for transects 1 and 2 ranged from 101–108 mm for asymptotic length (L∞), 0.27–0.28 year−1 for growth constant (k), and −0.99–0.94 for age at length zero (t0), respectively. Gonads were stained with haematoxylin and eosin and gametogenic stages were based on seven stages: (Stage 0) sexual rest; (Stage I) proliferation of gonad and start of gametogenesis; (Stage II) advanced gametogenesis; (Stage IIIA) ripeness; (Stage IIIB) start of spawning; (Stage IIIC) restoration; and (Stage IV) emission. The result showed that S. dactylus is a gonochoric clam and both males and females demonstrated synchronism in gonadal development. The gametogenic cycle began in late August and ended in late February. After several minor spawnings, plus a major one in January, the razor clams entered to the sexual rest stage in March.

Reproduction, growth and production of Amiantis umbonella (Bivalvia: Veneridae) on northern coast of the Persian Gulf, Bandar Abbas, Iran

2009 ◽  
Vol 90 (4) ◽  
pp. 711-718 ◽  
Author(s):  
Hanieh Saeedi ◽  
Aria A. Ardalan ◽  
Ehsan Kamrani ◽  
Bahram H. Kiabi
Keyword(s):  
Persian Gulf ◽  
Growth Parameters ◽  
Stage Iv ◽  
Dry Weight ◽  
Northern Coast ◽  
Active Stage ◽  
Sea Temperature ◽  
Amiantis Umbonella ◽  
Bandar Abbas ◽  
The Persian Gulf

Amiantis umbonella is distributed throughout the coast of the northern Persian Gulf. This study of 893 clams provides data on reproduction, growth and production for the period April 2007 to March 2008 from two transects along the Bandar Abbas coast. Histological preparations showed six stages of gametogenic development: resting stage (Stage 0), early active (Stage I), late active (Stage II), ripe (Stage III), partially spawned (Stage IV) and spent (Stage V). The specimens were gonochoric and showed synchronized spawning. The reproductive cycle commenced in September and finished in March with one major spawning event in January which correlated with lower sea temperature. Von Bertalanffy growth parameters for the sample were asymptotic length (L∞) = 58–62 mm, growth constant (k) = 0.28–0.29 yr−1 and length zero (t0) = –0.48 –0.47. The mean annual clam abundance, mean biomass and production were 10 individuals. m−2, 5.7 g shell free dry weight (SFDW) m−2 and 0.495 g SFDW m−2 yr−1, respectively.

Incidence and biology of Arcotheres tivelae (Crustacea: Decapoda) in Amiantis umbonella (Bivalvia: Veneridae) on the northern coast of the Persian Gulf, Iran

2010 ◽  
Vol 90 (4) ◽  
pp. 655-661 ◽  
Author(s):  
Hanieh Saeedi ◽  
Aria A. Ardalan
Keyword(s):  
Persian Gulf ◽  
Carapace Width ◽  
Host Record ◽  
Northern Coast ◽  
Significant Difference ◽  
The Mean ◽  
Amiantis Umbonella ◽  
Bandar Abbas ◽  
One Year ◽  
The Persian Gulf

The occurrence of pinnotherid crab Arcotheres tivelae in the bivalve mollusc Amiantis umbonella was investigated for one year on the Bandar Abbas coast (Persian Gulf, Iran). Specimens of A. umbonella were collected monthly from two transects from April 2007 to March 2008 and were investigated for presence of the Arcotheres tivelae. Infestation frequency of A. tivelae was 9.18% in a sample of 893 clams. From a total of 89 specimens of crabs, only eight were male. They were observed in late February and early March, all of them but one in association with female crabs. There was no significant difference between the sexes of the infested clams that pea crabs choose as a host. The mean carapace width of the crab A. tivelae was 7.7 ± 1.7 mm and the mean length of the Amiantis umbonella was 39.84 ± 8.93 mm. Clams in the mid and low tidal zones were more infested. There was no significant relationship between clam length–crab width (R2 = 0.28). The mean fecundity of crabs was 2517 ± 864 eggs. Infection caused a reduction of flesh weight of clams. There was no significant correlation between the frequency of crabs' occurrence and the temporal variability of water temperature, salinity, dissolved oxygen and pH in different months. This study provides the first report of the distribution of pea crabs A. tivelae in A. umbonella, a new clam host record in Iran.

scholarly journals Contamination, Identification and Distribution of Microplastic in Sediments, Surface Seawater and Four Species of Fish on the Northern Shores of the Persian Gulf, south of Iran

2021 ◽  
Author(s):  
Ali Agharokh ◽  
Mojtaba Taleshi ◽  
Mehdi Bibak ◽  
Majid Rasta ◽  
Hor Jafroudi ◽  
...  
Keyword(s):  
Persian Gulf ◽  
Northern Coast ◽  
Tourist Industry ◽  
Surface Seawater ◽  
Tourist Attractions ◽  
Predominant Form ◽  
Bandar Abbas ◽  
The Persian Gulf

Abstract The purpose of this study is to investigate Microplastic pollution (MPs) in important ports of the northern coast of the Persian Gulf. MPs were identified on the northern shores of the Persian Gulf in three compartments: sediment, seawater, and four species of fish. In December 2019, sampling was conducted in 7 sampling areas. In this study, 357 MPs were identified in all samples. The predominant polymer in MPs was polypropylene (PP) and later polyethylene (PE). The most polluted areas in terms of MPs in sediments, seawater, and fish were Bushehr, Bandar Abbas, and Qeshm. The fiber was the predominant form of MPs in all sampling stations and those samples taken from the surface seawater, sediments, and fish. The presence of fishing ports with fishing tools, commercial ports, the tourist attractions, and the tourist industry in these areas was an important factor controlling the distribution of MPs in these areas.

Age and growth of flathead, Platycephalus indicus from the Persian Gulf (Bandar Abbas, Iran)

2014 ◽  
Vol 94 (5) ◽  
pp. 1063-1071 ◽  
Author(s):  
Dariush Mohammadikia ◽  
Ehsan Kamrani ◽  
Mohammad Reza Taherizadeh ◽  
Ayoub Soleymani ◽  
Ehsan Farokhi ◽  
...  
Keyword(s):  
Persian Gulf ◽  
Gonadosomatic Index ◽  
Mean Value ◽  
Age And Growth ◽  
Hepatosomatic Index ◽  
Mean Values ◽  
Males And Females ◽  
The Mean ◽  
Bandar Abbas ◽  
The Persian Gulf

In a study of the age and growth of Platycephalus indicus, a total of 1106 fish were collected from May 2011 to March 2012 in the coastal waters of Iran, Persian Gulf. The ages of 279 specimens were determined by sectioned otoliths. The ages of the females were estimated to be between 0+ to 7+ , while the ages of the males were from 0+ to 4+. The von Bertalanffy growth curve was well suited to the age/total length data of males and females as follows: Lt = 43.40{1–exp[−0.45(t + 0.328)]} for males, and Lt = 63 {1–exp[−0.50(t + 0.30)]} for females. linf = 43.40, k = 0.45, t0 = −0.328 for females and linf = 63, k = 0.50, t0 = −0.30 for males. The estimated values of natural mortality (M) were M = 0.886 yr−1 for females and 0.736 yr−1 for males, and the estimated Z values were 1.43 yr−1 for females and 1.62 yr−1 for males. The mean value of the gonadosomatic index for males and females was 0.82 ± 0.25 and 2.48 ± 0.59, respectively, in each year. The mean values of the hepatosomatic index (HSI) were 0.89 ± 0.20 for males and 1.28 ± 0.16 for females. The highest HSI values for this location were observed in January, and the lowest were in April.

Further data on Iranian marine nematode diversity, with description of three new Desmodoridae Filipjev, 1922 (Nematoda: Desmodorida) species from the Persian Gulf

Nematology ◽  
2021 ◽  
pp. 1-22
Author(s):  
Azadeh Gharahkhani ◽  
Ebrahim Pourjam ◽  
Daniel Leduc ◽  
Majid Pedram
Keyword(s):  
Persian Gulf ◽  
Buccal Cavity ◽  
First Record ◽  
The Body ◽  
Pharyngeal Bulb ◽  
Close Relationship ◽  
Nematode Diversity ◽  
Males And Females ◽  
The Persian Gulf ◽  
Amphidial Fovea

Summary The Desmodoridae is a diverse and widespread family of free-living nematodes. Here, we provide the first record of the group in the Persian Gulf and describe three new species: Metachromadoroides sinuspersici sp. n., Zalonema iranicum sp. n. and Z. supplementorum sp. n. Metachromadoroides sinuspersici sp. n. is characterised by finely annulated cuticle, short and stout cephalic sensilla, amphidial fovea on cuticular thickening, pharyngeal bulb well developed and partitioned into three sections, absence of precloacal supplements, and presence of 6-8 pairs of rounded postcloacal papillae. Zalonema iranicum sp. n. is characterised by papilliform subcephalic sensilla (best observed with SEM), convex cephalic capsule, large multispiral amphidial fovea with 4-5 turns in both males and females, buccal cavity with one ventrosublateral and two dorsal teeth and posterior body of males with lateral alae extending from the last third of the body to the cloacal aperture and ventral alae extending 1395-2250 μm anterior to the cloacal aperture, and no precloacal supplements. Zalonema supplementorum sp. n. is characterised by four subcephalic sensilla 1-2 μm long, multispiral amphidial fovea with three turns in both males and females, buccal cavity with one dorsal and two ventrosublateral teeth, males with lateral alae present on each side of body from posterior half of body to cloacal aperture, ventral alae extending 942-1257 μm anterior to cloacal aperture, strongly cuticularised spicules 41-43 μm long, and 12-16 precloacal supplements. Near full length SSU and partial D2-D3 LSU sequences are provided for M. sinuspersici sp. n. and Z. iranicum sp. n., and the COI sequence is provided for Z. iranicum. The SSU phylogeny suggests a close relationship between M. sinuspersici sp. n. and Metachromadora and Metachromadoroides species and the monophyly of Zalonema (after currently available data). The LSU phylogeny suggests an affinity between Metachromadoroides and Zalonema with Spirinia and Acanthopharynx, respectively.

scholarly journals A fifth-millennium BC cemetery in the north Persian Gulf: the Zohreh Prehistoric Project

Antiquity ◽  
2016 ◽  
Vol 90 (353) ◽  
Author(s):  
Abbas Moghaddam
Keyword(s):  
Persian Gulf ◽  
Focal Point ◽  
Research Programme ◽  
Northern Coast ◽  
Archaeological Survey ◽  
Khuzestan Province ◽  
Digital Reference ◽  
The North ◽  
Registration Number ◽  
The Persian Gulf

The Zohreh Prehistoric Project (ZPP), a long-term archaeological research programme focused on the river valley south of the modern city of Behbahan in Khuzestan Province, was launched in April 2015 (Figure 1). The valley, which lies in close proximity to the northern coast of the Persian Gulf, was surveyed extensively during the early 1970s by Hans Nissen from the Oriental Institute of the University of Chicago (Nissen & Redman 1971; Dittmann 1984, 1986). The ZPP aims to develop full-coverage archaeological survey of the valley, focusing on the human landscape over time, mostly in relation to settlement hierarchy and dynamics, modes of production and the emergence of regional centres at the end of the fifth and beginning of the fourth millennia BC. The focal point for the project is the principal site of the Zohreh Valley, known as Tol-e Chega Sofla (39RN1Q22108; the site was previously registered as Chogha Sofla, BZ.71 (Dittmann 1984: 110). We have changed this to reflect its local name. The digital reference is the unique Iranian archaeology map registration number.

scholarly journals Relationship between the Persian Gulf Sea-Level Fluctuations and Meteorological Forcing

2020 ◽  
Vol 8 (4) ◽  
pp. 285
Author(s):  
Naghmeh Afshar-Kaveh ◽  
Mostafa Nazarali ◽  
Charitha Pattiaratchi
Keyword(s):  
Sea Level ◽  
Persian Gulf ◽  
Atmospheric Pressure ◽  
Tide Gauge ◽  
Low Frequency ◽  
Northern Coast ◽  
Meteorological Forcing ◽  
Sea Level Fluctuations ◽  
Coastal Sea ◽  
The Persian Gulf

Sea-level data from six tide gauge stations along the northern coast of the Persian Gulf were analyzed both in time and frequency domain to evaluate meteorological forcing. Spectral analyses indicated that mixed, predominantly semi-diurnal tides were dominant at all stations, but low-frequency fluctuations correlated well with atmospheric pressure and wind components. Non-tidal sea-level fluctuations up to 0.75 m were observed along the northern coasts of the Gulf due to the combined action of lower atmospheric pressure and cross-shore wind. Coherency between low-frequency sea-level records and mean sea-level pressure indicated that the latter usually leads to sea-level fluctuations between 1 and 6.4 days. In contrast, the same analysis on the wind velocity and sea level revealed that the former lags between 3 and 13 days. The effect of wind stress on coastal sea-level variations was higher compared with the effect of atmospheric pressure. Concurrent analysis of low-pass-filtered sea-level records proved that the non-tidal wave moves from west to east along the northern coasts of the Persian Gulf.

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