جستجوی مقالات مرتبط با کلیدواژه « gastrointestinal vacancy index » در نشریات گروه « زیست شناسی »

The feeding characteristics of Alburnus sellal in the Little Zab River, west Azarbaijan Province, Iran were studied from November 2021 to October 2022. The specimens were collected and anesthetized in 1% clove oil, fixed in 10% buffered formalin, and transferred to the laboratory. The average condition factor for males and females was 0.85 showing a significant difference between different months in both sexes (P<0.05). The average length and weight for all specimens were 11.36±1.95cm and 11.8±7.14g, respectively. The average length of gut (RLG) for all fish was 0.65±0.11 during the year. The mean RLG in different months showed significant differences (P<0.05). The highest Gastrosomatic index value was recorded in January and those lowest in August and showed significant differences in different months (P<0.05). A total of 34 empty stomachs were observed amongst the 95 specimens and there were significant differences in different months (P<0.05). This species is an omnivorous fish that mainly consumes aquatic insects, aquatic plants, algae, diatoms, and organic decay material with modest feeding throughout the year.

The feeding characteristics of Aphanius isfahanensis in the Zayandeh River of Isfahan Province were studied by collecting 440 specimens (220 males and 220 females) from July 2016 to May 2017. The specimens were anesthetized in 1% clove oil, fixed in 10% buffered formalin and transferred to the laboratory. The average condition factor for males was 1.7, for female 1.26 and showed significant difference between different months in both sexes (P<0.05). The average length and weight for all specimens were 38.57±5.24mm and 1.00±0.41g, respectively. The average length of gut (RLG) for all fish was 0.54±0.17 during the year. The mean RLG in different length classes showed significant differences (P<0.05). The highest Gastrosomatic Index value was in July (0.05) and the lowest in August (0.03) and showed significant differences in different months (P<0.05). A total of 181 empty stomachs were observed amongst the 440 fish and there were significant differences in different months (P<0.05). Therefore, it can be concluded that this is a carnivorous fish (mainly aquatic insect larvae) with a modest feeding throughout the year