بررسي و مقايسه خصوصيات مورفولوژي و مورفومتري اتوليت دو گونه ازكفال ماهيان؛ كفال طلايي درياي خزر (Liza aurata) و گاريز (Liza klunzingeri) خليج فارس

Comparison of morphologic and morphometric characteristics of two species of the Mugillidae; golden mullet (Liza aurata) from the Caspian Sea and Garyz Klunzinger Mullet (Liza klunzingeri) from the Persian Gulf

به منظور مقايسه پارامترهاي ريخت‌ شناسي و زيست‌ سنجي اتوليت ساجيتاي دو گونه كفال طلايي (Liza aurata) از درياي خزر و ميد (Liza klunzingeri) از خليج فارس، اتوليت ساجيتا 35 قطعه ماهي از هر گونه پس از خارج شدن از ناحيه زير آبشش ‌ها، شستشو و از لحاظ پارامترهاي ريخت‌ شناسي و زيست‌ سنجي چون طول، عرض، ضخامت و نماي ظاهري از لحاظ روستروم، پست روستروم، آنتي روستروم، شيار سولكوس، لبه شكمي و پشتي در ساجيتاي راست و چپ و هم ‌چنين از لحاظ شاخص ‌هاي اندازه‌ گيري اتوليت، مورد بررسي قرار گرفتند. نتايج نشان دادند كه شكل ظاهري اتوليت‌ ها در دو گونه متفاوت بودند اما از لحاظ شاخص‌ هاي اندازه‌ گيري اتوليت، هر دو گونه داراي شاخص طولي و كشيدگي متوسط و شاخص ضخامت نازك بودند. بين طول اتوليت راست و چپ و ضخامت اتوليت راست و چپ درگونه كفال طلايي رابطه معني‌ داري مشاهده شد (0/05>p). اما بين پهناي اتوليت راست و چپ، بين طول و پهناي اتوليت و بين طول و ضخامت اتوليت رابطه معني ‌داري مشاهده نشد (0/05p) اما بين ضخامت اتوليت است و چپ، بين طول و پهناي اتوليت و بين طول و ضخامت اتوليت اين گونه رابطه معني‌ داري مشاهده نشد (0/05

For comparing the morphology and morphometric otolith parameters in Liza aurata of Caspian Sea and Liza klunzingeri of Persian Gulf, 35 otolithes (Sagittae) of every species are extracted from under gills region. After washing, their morphometric parameters measured. These parameters include otolith length, width, thickness, ant rostrum, and rostrum, post rostrum in right and left sagittae. In addition to the otolith outline, mode position and mode opening of the sulcus acusticus were examined. Obtained results shown that otolith shape was different in two species. In both of them otolith was medium in size and long. Their thickness was thin. There was a strong correlation between right and left otolith length and right and left otolith thickness in Liza aurata (p≤0.05).but There was not a correlation between right and left otolith width, between otolith length and width and otolith length and thickness(p≥0.05) There was a strong correlation between right and left otolith length and right and left otolith width in Liza klunzingeri (p≤0.05).but There was not a correlation between right and left otolith thickness, between otolith length and width and otolith length and thickness(p≥0.05). Difference in regression relationship between morphometric characteristics of otolith in two species indicates the latitude and temperature effect on the morphometric characteristics of the two species of mullet fish.