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| Microalgal Size Gradation of Food in Liaodong Bay |
| LIU Suxuan1, SONG Lun2, HU Chaokui2, WANG Kun2, LIU Yin1, ZHANG Mingliang1, DONG Shaojie3 |
1.Dalian Ocean University, Dalian 116023, China;
2.Key Laboratory of Marine Biological Resources and Ecology, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China;
3.Key Laboratory of Aqua-Ecology and Aquaculture of Tianjin, College of Fisheries, Tianjin Agricultural University, Tianjin 300384, China |
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Abstract The feeding power of microalgae food in Liaodong Bay was studied by high-throughput sequencing-molecular identification and grading technique. The results showed that small-sized microalgae dominated Liaodong Bay in four seasons, with the dominant species of Aureococcus anophagefferens, Microcystis pusilla, Nannochloris sp. and Botrytis sp.. In spring, summer, autumn and winter, the biomass of microalgae of small size was as high as (51±14)%, (43±14)%, (49±6)% and (42±4)%, the biomass of medium size was (29±7)%, (34±15)%, (24±5)% and (42±4)%, and the biomass of large size was (21±10)%, (23±13)%, (27±3)% and (17±4)%, respectively. The feeding power of microalgae in Liaodong Bay was mainly contributed by spring and summer. The areas with higher feeding power in spring were mainly distributed in the upper and middle of Liaodong Bay, while in summer they were mainly distributed in the southeast and west waters of Liaodong Bay. The actual carrying capacity of shellfish in Liaodong Bay was 155 g/m2 in spring, 203 g/m2 in summer, 48 g/m2 in autumn and 33 g/m2 in winter. The finding can provide technical guidance for scientific culture and multiplication of filter-feeding shellfish.
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Received: 30 September 2020
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