Feeding ecology of the grooved tiger shrimp Penaeus semisulcatus De Haan (Decapoda: Penaeidae) in inshore waters of Qatar, Arabian Gulf

摘要: The feeding ecology of the green tiger shrimp Penaeus semisulcatus was studied in inshore fishing grounds off Doha, Qatar, using a combination stable isotope (δ13C and δ15N) analysis gut contents examination. Samples post-larvae, juvenile adult other organisms were collected from intertidal subtidal zones during spawning season (January–June). Shrimp shallow water seagrass beds mostly post-larvae juveniles significantly smaller than older adults caught deeper macroalgal beds. Gut content examination indicated that fed mainly on benthos such as Foraminifera, polychaetes, benthic diatoms small crustaceans (amphipods, isopods ostracoda), whereas larger bivalve molluscs to lesser extent polychaetes. In both algal beds, unidentifiable detritus also present (18, 32%). δ13C values for muscle tissue ranged −9.5 ± 0.26 −12.7 0.05‰, δ15N increased with increasing size, ranging 4.1 0.03 7.7 0.11‰. Both consistent dietary sources by primary producers prey species. data demonstrates are important habitats P. semisulcatus, while transition involves change diet source carbon nitrogen is reflected ratios. results study confirm linkage between sensitive key life stages an commercially-exploited species indicate need suitable assessment potential indirect impacts coastal developments involving dredging land reclamation.