برآورد پیراسنجه های رشد و مرگ و میر ماهی گواف رشته دار (Nematalosa nasus (Bloch, 1795 در آب های ساحلی هرمزگان (خلیج فارس)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیلات، دانشکده علوم و فنون دریایی، دانشگاه هرمزگان، بندرعباس، ایران

2 گروه علوم طبیعی و زیست‌محیطی، پژوهشکده منطقه‌ای جنگل‌های حرا، دانشگاه هرمزگان، بندرعباس، ایران

10.22034/AEJ.2021.292364.2570

چکیده

پارامترهای رشد و مرگ ومیر ماهی گواف رشته دار Nematalosa nasus در یک دوره زمانی 18 ماهه از مهرماه 95 تا فروردین ­ماه 97 در آب ­های ساحلی استان هرمزگان بررسی شد . نمونه ­برداری به­ صورت ماهانه و در­ مجموع تعداد 618 قطعه ماهی گواف رشته ­دار به­ عنوان صید ضمنی میگو انتخاب و مورد زیست ­سنجی قرار گرفتند. ضرایب تشخیص در رابطه طول چنگالی- وزن برای ماهیان نر و ماده به ترتیب 0/71 و 0/72 و مقدار b  برای جنس نر و ماده به ترتیب 2/58 و 2/69 برآورد شد که نشان از رشد ناهمگون منفی در این ­گونه بود (P<0/05). طول چنگالی بی نهایت (∞FL) برای جنس نر و ماده به ترتیب 172 و 176 میلی متر، ضریب رشد (K) برای جنس نر 1/3 در سال و برای جنس ماده 1/1 در سال و ( مقدار t0-) برای جنس نر و ماده به ترتیب 0/07- و 0/08- برآورد شد. شاخص ضریب رشد مونرو در جنس نر و ماده به ترتیب 4/59 و 4/53 به دست آمد. نتایج این تحقیق نشان داد که میزان مرگ ومیر طبیعی (M) در جنس نر و ماده به ترتیب 1/28 و 1/14 در سال و میزان مرگ و میر صیادی (F)  برای جنس نر 3/25 و در جنس ماده 2/23 در سال بود. میزان مرگ و میر کل (Z) برای جنس ­های نر و ماده به ترتیب 4/53 و 3/37 در سال برآورد شد. ضریب بهره ­برداری (E) برآورد شده برای این ­گونه (در جنس ماده 0/66 و در جنس نر 0/72) نشان از فشار صید بر روی این­ گونه در منطقه می باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimate growth and mortality parameters of Nematalosa nasus (Bloch, 1795 ) in coastal waters of the Persian Gulf (Hormozgan Province)

نویسندگان [English]

  • Somayeh Faryabi 1
  • Mohsen Safaie 1 2
  • Soodabeh Sahami 1
  • Faezeh Izadi far 1
1 Department of Fisheries, Faculty of Marine Science and Technology, Hormozgan University, Bandar Abbas, Iran
2 Department of Natural and Environmental Sciences, Mangrove Forest Research Center, Hormozgan University, Bandar Abbas, Iran
چکیده [English]

Some population parameters of N.nasus were studied by using Bottom-trawler for a period of 18 months from Nov 2016 to Apr 2018 in the coastal waters of the Persian Gulf (Hormozgan province). A total of 618 fish were selected as bycatch from shrimp bottom trawl and measured biometric data. The correlation between total length and weight for males and females showed a high value (R2 were estimated at 0.71 and 0.72 for males and females, respectively.  The b-value for length-weight relationship was 2.58 and 2.69 for males and females, respectively, indicating a positive allometric growth pattern in this species (P<0.05).  The FL∞ was estimated at 172 mm for males and 176 mm for females. In addition to the growth coefficient (K) for males and females was estimated at 1.3 and 1.1 Y-1, respectively. Also, t0 for males and females were -0.07 and -0.08Y-1, respectively. The Φ` coefficient index in males and females were 4.59and4.53, respectively. The recorded results of this study showed that the natural mortality rate (M) in males was 1.28 Y-1and for females were 1.14 Y-1and the fishing mortality rate (F) was 3.25 in males and 2.23 Y-1 in females, respectively. The total mortality (Z) for males and females was estimated at 4.53 and 3.37 Y-1, respectively. Also, the exploitation coefficient (E) for this species was 0.66 and 0.72 in males and females, respectively.                                                                                                                                                        

کلیدواژه‌ها [English]

  • N. nasus
  • Growth parameters
  • Hormozgan
  • Persian Gulf

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فصلنامه محیط زیست جانوری
دوره 14، شماره 2
تیر 1401
صفحه 199-204

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