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Articles by T. Valinassab
Total Records ( 4 ) for T. Valinassab
  S.A. Hosseini , S. Jamili , T. Valinassab , G. Vosoghi and S.M.R. Fatemi
  This study, being conducted in 2006-2007, attempts to investigate its biological habit and characteristics in Iran`s water of the Persian Gulf. For the sampling purpose, three major landings namely Bushehr, Deylam and Genaveh were selected to obtain samples from commercial catches. The sampling is composed of 655 males and 515 females during a twelve month period. By studying the feeding through the counting method, it is revealed that, Liza subviridis characterized by 42.8% and Sepia pharaonis by 8.4% made the highest and lowest stomach content, respectively. The findings showed that male fish in smaller size will mature sooner than females specimen but this sex ratio or proportion was not significantly different except during October and September. Such a difference between male and female in different months could be originated from longer residing of female group in spawning ground compared to male group. The earlier spawning lasted during September-October and there was a peak of spawning in feeding in August. The lowest fat proportion for both male and female genders was reported 0.10 and 0.11, respectively in October; but the highest level of condition factor was reported to be 0.59 and 0.63 during November and June.
  M. Kerdgari , T. Valinassab , S. Jamili , M.R. Fatemi and F. Kaymaram
  Since the N. japonicus comprises the most abundant commercial fish in the Persian Gulf, an evaluation of the stock status of this species is needed. Reproductive biology of Nemipterus japonicus in the northern part of Persian Gulf is described, based on 595 specimens collected between November 2006 and October 2007. Length range of females was 11.0-26.3 cm FL and their weight range was 21.7-325.65 g. Males ranged from 9.4-27.3 cm FL and 14.04-351.89 g in weight. The relationship between Body Weight (BW) and Fork Length (FL) for all individuals was estimated as BW = 0.0181xFL3.0001 (r2 = 0.9797, n = 503). The overall sex ratio was estimated as M: F = 1.0: 2.6. The length at 50% maturity was estimated to be 19.1 cm for females and 19.6 cm for males. The smallest size at first maturity was 9.4 cm for males and 11.0 cm for females. The spawning behavior was investigated based on macroscopic observations of gonads and determination of gonadosomatic index. The maximum GSI values were recorded in April (2.70%) and September (0.45%) for females and males, respectively. Spawning occurs in spring and autumn seasons.
  S.M. Reza Fatemi , S. Jamili , T. Valinassab and N. Kuranlu
  We report on result of an investigation along Lengeh Port and Qeshm Island to determine the species of Ophiuroidea in Persian Gulf. Collection of Ophiuroids was done by hand from the total 23 locations at rocky intertidal flats of Lengeh Port and Qeshm Island in 2007. Identification of the collected samples was carried out using several keys. Two Ophiuroids species belonging to a single family Ophiocomidae, including Ophiocoma erinaceus (Müller and Troschel, 1842) and Ophiocoma scolopendrina (Lamark, 1816) were identified. Ophiocoma erinaceus has not been previously reported from the Persian Gulf (neither North nor South). Single specimen of O. erinaceus apeared to be O. erinaceus Müller and Troschel, 1842 (schoenleini M. and T.1842, form) due to one tentacle scale in most parts of arms except 6 first segments and three arm spines on fourth segment and disc granules extending into oral interradius of disc. Ophiocoma scolopendrina have shown varied color patterns. The present paper is mainly centered around and aimed at representing O. scolopendrina which with 83 records, seems to be a common species of Ophiuroidea in rocky and rocky-sandy coast of Lengeh Port and Qeshm Island. This finding indicated that further sampling especially in deeper waters would be probably resulted into finding of additional Ophiuroids taxa.
  F. Mohammadizadeh , T. Valinassab , S. Jamili , A. Matinfar , A.H. Bahri-Shabanipour and M. Mohammadizadeh
  The present study investigated feeding habits and diet composition of Sawtooth barracuda (Sphyraena putnamae) by regular monthly collection throughout 13 months from November 2006 to November 2007 in the Northern Persian Gulf. Sawtooth barracuda is considered as one of the valuable fishes in the Persian Gulf. The 486 specimens of Sphyraena putnamae were examined. The highest and the lowest observed Fork length and body weight was 10.6 and 93.0 cm and 8.03 and 40.0 g, respectively. The fork length-weight relationships was W = 0.0071 FL2.9295 (R2 = 0.99). Studies have showed that this fish, having the Relative Length of Gut RLG = 0.34±0.002, is strongly carnivorous (meat-eater, often fish-eater), proven by the fact that more than 98% of its stomach contents are fish. The CV = 0.47% indicates the middle alimentary of this fish. Index of condition factor (Kf), increasing in March and decreasing in June. Gastro-Somatic Index (GaSI), indicating the highest level in the month of January and July and lowest level in June and October. The Fullness Index (FI) increases in March before spawning and decreases in June and September during spawning.
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