Fatty acid composition and feeding habit of fish in the Pearl river from Guangzhou to Humen
ZHANG Ting, XIANG Gang, LONG Sheng-xing
2020, 59(14):
125-132.
doi:10.14088/j.cnki.issn0439-8114.2020.14.025
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Fish are important consumers in aquatic ecosystem. Different of fish species were collected form the Pearl river, and the fatty acid content of fish were determined in order to understand characteristic of feeding habits. The results showed that Tilapia zillii, Cirrhinus molitorella, Hypostomus plecostomus, Cyprinus carpio, Hypophthalmichthys molitrix, Squliobarbus curriculus, Carassius auratus, Parabramis pekinensis, Odontamblyopus rubicundus, Chaeturichthys stigmatias, Coilia grayi and Lateolabrax maculatus are main common species in the river. The main fatty acids in fish including saturated fatty acids C14∶0、C15∶0、C16∶0、C17∶0、C18∶0, monounsaturated fatty acids C16∶1ω7、C18∶1ω9、C20∶1ω11, polyunsaturated fatty acids C18∶2ω6、C16∶3ω3、C20∶2ω6、C20∶4ω6、C20∶5ω3和C22∶6ω3. Saturated fatty acids concentration in fish changed from 1 001.49 to 97 634.47 μg/g, with average 33 044.02 μg/g, monounsaturated fatty acids concentration in fish changed from 1 161.09~170 924.8 μg/g, with average 33 044.02 μg/g, and polysaturated fatty acids concentration in fish changed from 859.99~98 269.52 μg/g, with average 23 846.78 μg/g. Fatty acid biomarkers showed that Clarias fuscus, Erythroculter pseudobrevicauda, Clarias lazera, Channa maculate, Channa asiatica, Collichthys lucidus, Lateolabrax maculatus, Cynoglossus joyneri, Squliobarbus curriculus, Carassius auratus, Aristichthys nobilis, Coilia grayi, Mugil cephalus, Anguilla japonica, Hypophthalmichthys molitrix, Misgurnus anguillicaudatus, Tilapia zilliimainly feed on attachments, benthic organisms, zooplankton and phytoplankton, and their carnivorous characteristics increase with body weight increasing.