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  • Otolith  (4)
  • 2020-2022  (4)
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  • 1
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    Morphological characteristics of lapillus and aging of Plicofollis dussumieri (Ruppell, 1837) from Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/22792 | 18721 | 2018-05-22 19:40:40 | 22792 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: In this paper age determination and morphological characteristics of blacktip catfish, Plicofollis dussumieri, from Oman Sea were evaluated. A total of 132 fish specimens were collected from fishing trawlers or landings from March 2011 to July 2012, with minimum and maximum of 245 mm, 195 g; and 767 mm, 5801 g, respectively. Maximum life span was 12 years for the length range of 245 – 767 mm FL, while total body weight (BW) ranged between 195 and 5801 g and the resultant equation was: W = 0.040 L^2.8275 (R^2 = 0.99). High correlation coefficient value found between age and FL was R= 0.97 and for age-BW was 0.94. This value for otolith weight and BW was estimated to be 0.91 and showing that there were significant correlations between measured parameters. Lapillus otolith in blacktip catfish is the biggest otolith among most teleostei fishes, also the Sagitta is the biggest. Lapillus of this species is round, robust, onion-like and without sulcus curve, with no obvious growth increments in rostrum and antirostrum zones. In ventral side Gibbus maculae is concave having prominentia marginalis in anterior and basal line in posterior parts.
    Keywords: Biology ; Fisheries ; Blacktip catfish ; Morphology ; Age ; Otolith ; Oman Sea ; Biology ; Physiology ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 494-502
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  • 2
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    Age determination and feeding habits of Nemipterus japonicus (Bloch, 1791) in the northern Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/22595 | 18721 | 2018-04-27 07:34:45 | 22595 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    Description: Age determination and feeding habits of the Japanese threadfin bream, Nemipterus japonicus, was carried out in the northern Oman Sea (Chabahar area), based on 212 specimens collected between September 2009 and May 2010. The minimum and maximum fork length and body weight were measured as 145, 258 mm and 55.31, 288.12 g. The relationship between Body Weight (BW) and Fork Length (FL) for all individuals was estimated as BW= 0.0001×FL2.83 (r2 = 0.9425, n= 212). The Vacuity Index (VI) was 55.2% that shows N. japonicus is a moderate feeder. The maximum and minimum Gastro-Somatic Index for males was in autumn and winter seasons and for females were in summer and spring. The Food Preference Indices were estimated as: crustacean (63.2%) as main food fishes (38.9%) and molluscs (36.8%) as minor food. Age determination was done by otolith sectioning. A total of 135 sagitta were sectioned. The maximum age was 5+ years old for a female with FL= 256 mm and the youngest one was 1 year old for a female with FL= 145 mm. Based on obtained results there is a significant relationship between feeding and age namely with increase of age, the feeding rate is decreased without any changes in type of feeding and food contents.
    Keywords: Biology ; Fisheries ; Nemipterus japonicus ; Feeding ; Age ; Otolith ; Oman Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 248-264
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  • 3
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    Comparison of morphometric characteristics of otolith for ten Clupeid species of the Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/21842 | 18721 | 2018-01-14 19:21:10 | 21842 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-03
    Description: Morphometric comparison of sagitta otolith in 10 clupeid species of the Persian Gulf and Oman Sea including Anodontostoma chacunda, Dussumieria acuta, Dussumieria elopsoides, Ilisha megaloptera, Ilisha melastoma, Nematolosa nasus, Sardinella gibbosa, Sardinella longiceps, Sardinella sindensis and Tenualosa ilisha), was conducted during 2007-2008. We found no significant differences in morphology and morphometry of the left and right otoliths except for A. chacunda and N. nasus. For the latter species the left sagitta otoliths were used. Investigation of otolith morphometric characteristics (length, breadth, weight, perimeter, area, and number of scallops) was also conducted which showed perimeter and number of scallops were the most effective individual otolith characteristics for distinguishing between species. The study indicated that sagitta otoliths have particular morphometric characteristics which are useful in identification of these species.
    Keywords: Biology ; Fisheries ; Otolith ; Morphometric characteristics ; Iran ; species ; Comparison ; Anodontostoma chacunda ; Dussumieria acuta ; Dussumieria elopsoides
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 141-152
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  • 4
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    Growth pattern and daily growth increment in lanternfish (Benthosema pterotum) of the Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21827 | 18721 | 2018-01-11 10:04:13 | 21827 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: Lanternfish (Benthosema pterptum) is one of the most important fish species in the Oman Sea. We randomly sampled 300 myctophids from different depths in spring and winter 2009 in the Oman Sea using mid-water trawls. Male to female sex ratio was 0.36:0.64. The thin sections (60-80µm) of sagitta otoliths of the fish were prepared using polishing method. These sections showed that increment growth rings of lanternfish otolith are formed daily and the age condition is distinguishable on a daily basis. We found the life span of the species to be short (with a maximum of 349 micro-increments counted) and probably less than a year. The relationship between standard length (SL) and daily growth increment (D) was expressed as the linear equation: SL=0.87D+12.37 (R 2=0.97). The relationship between lanternfish weight (W) and daily growth increment (D) was expressed as power equation: W=0.00003D1.754 (R2=0.95). Furthermore, morphometrical characteristics of otolith including otolith weight and length and daily growth increment relationships were expressed as linear equation (R2=0.96 and R 2=0.83). The results showed that lanternfish growth rate were in the range 0.241mm/d-1 to 0.138mm/d-1 and decreased by body size and age in this range.
    Keywords: Biology ; Fisheries ; Lanternfish ; Benthosema pterotum ; Otolith ; Morphometric ; Oman Sea ; Iran ; Growth ; fish ; age
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 147-160
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