2023 Volume 79 Issue 18 Article ID: 23-18052
We have found out fluctuations of benthos and fish fauna in the coastal area with oyster-shells laid down, and analyzed their food web with stable isotope for three years. The species number and diversity (H’) of benthos and the individual number of fish within the period were respectively 18.2±10.3, 3.1±0.7 and 4.8±6.3 (/m2); represented 3.5, 2.2 and 7.5 times as many as those in the control area without shells. δ15N/δ13C ratio gradually increased with trophic level, from mud on the laid shells (9.1±0.5 ‰ / - 20.2±0.8 ‰), benthic mollusks (12.2±1.7 / -18.1±2.3), arthropods (13.2±1.5 / -17.1±0.9) to fish caught in laid area (16.4±1.0 / -16.2±0.6), respectively. These results support benthic fauna richness made on /in laid shells contribute great to fish habitat growth.
