تغییرات شاخص‌های جمعیتی براساس طول ماهی شوریده (Bloch & Schneider, 1801) Otolithes ruber طی دو بازة زمانی در آب‌های شمالی دریای عمان (استان سیستان و بلوچستان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، مرکز تحقیقات شیلاتی آبهای دور، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، چابهار، ایران

2 دانشیار، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

10.22059/jfisheries.2023.357630.1378

چکیده

به‌منظور بررسی تغییر شاخص‌های جمعیتی ماهی شوریده زیست‌سنجی تعداد 3551 عدد ماهی شوریده (1581 عدد  در سال 1371 و 1970 عدد در سال 1401) انجام شد. نتایج نشان داد که  میانگین طولی‌ نمونه‌ها در سال 1371، 8±42 و در سال 1401،  7±38 سانتی‌متر بوده است. همچنین، میانگین دامنه وزنی ماهی شوریده در سال 1371، 130 ±642  گرم و میانگین وزنی در سال 1401، 180±638  گرم به‌دست آمد. رابطة طول و وزن بدن ماهی شوریده براساس سال‌های مورد مطالعه محاسبه شد و رابطة طول چنگالی و وزن برای سال 1371 (89/0=R2، 750=N)95/2L012/0 =Wو سال 1401 (86/0=R2، 703=N)56/2L05/0=W به‌دست آمد. معادلة ون‌‌برتالانفی برای این گونه در استان سیستان و بلوچستان در سال‌های 1371 و 1401به‌ترتیب به‌صورت: Lt= 66 (1- exp (-0.41 (t +0.32)) و  Lt= 66 (1- exp (-0.53 (t +0.22)) محاسبه شد. حداکثر محصول پایدار (MSY) در سال 1371میزان  1293 تن و در سال 1401میزان  2417 تن برآورد شد. همچنین  نسبت زی‌تودة فعلی به زی‌تودة اولیه (B/BV or B/B0) در سال‌های 1371 و 1401 به‌ترتیب 4.0 و  0/35 برآورد شد. نسبت زی‌تودة فعلی به زی‌تودة حداکثر محصول پایدار (1 <B/BMSY) در سال‌های 1371 و 1401 نیز به‌ترتیب 0/81 و 0/71 به‌دست آمد. نسبت پتانسیل مولدین براساس طول در سال 1371، 0/50 و در سال 1401 ، 0/40 به‌دست آمد. براساس یافته‌ها، می‌توان نتیجه گرفت که کاهش میانگین طول، افزایش مرگ و میر صیادی و مرگ و میر کل و در نهایت شاخص مرگ و میر صیادی موجود به مرگ و میر صیادی حداکثر محصول پایدار (1 >F/FMSY) می‌تواند دلیلی بر وجود صید بی‌رویه این گونه باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Changes in demographic parameters based on the length of tigertooth croaker (Otolithes ruber Bloch & Schneider, 1801) during two periods of time in the northern waters of the Oman Sea (Sistan and Baluchistan Province)

نویسندگان [English]

  • Seyed Ahmad Reza Hashemi 1
  • Seyed Aminollah Taghavi Motlagh 2
  • Mastooreh Doustdar 2
1 Assistant Professor, Offshore Fisheries Research Center, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Chabahar, Iran
2 Associate Professor, Iranian Fisheries Science Research Institute, Agricultural Research, Education and Extension Organization, Tehran, Iran
چکیده [English]

In order to investigate the changes in the population indices of Otolithes ruber fish during the years 1992 and 2022, the biometry of 3551 tigertooth croaker fish was done and the average length 42±8 cm and 38±7 cm, respectively. The average weight of this species was 642±130 grs in 1992 and 638±180 grs in 2022. The relationship between fork length and body weight for the year 1992, was W=0.012*L2.95 (R2=0.85, N=750) and for the year 2022, was W=0.05*L2.56 (R2=0.86, N=703). Von bertalanffy equation for this species in the northern waters of the Oman Sea (Sistan and Baluchistan Province) was calculated in 1992 and 2022, respectively as Lt =66 (1-exp (-0.41 (t +0.32)) and Lt =66 (1-exp (-0.59 (t +0.32)). The maximum sustainable yield (MSY) and the ratio of current biomass to initial biomass (B/BV or B/B0) in 1992 and 2022 was estimated as 1293 tons, 0.40 and 2417 tons, 0.35, respectively. The ratio of spawning potential based on length in 2022 and 1992 were 0.4 (0.36-0.44) and 0.5 (0.4-0.59), respectively. Based on data of decrease in the average length, increase of fishing, total mortality and ratio of the fishing mortality to the fishing mortality of the maximum sustainable yield (F/FMSY >1), it can be concluded that there are reasons for overfishing.

کلیدواژه‌ها [English]

  • Otolithes ruber
  • Spawning potential ratio
  • Von bertalanffy equation
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