
TY  - JOUR
A1  - Vance, DJ 
A1  - Heales, DS 
A1  - Loneragan, NR 
T1  - Seasonal, diel and tidal variation in beam-trawl catches of juvenile grooved tiger prawns, <I>Penaeus semisulcatus</I> (Decapoda:Penaeidae), in the Embley River, north-eastern Gulf of Carpentaria, Australia
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1994
VL  - 45
IS  - 1
SP  - 35
EP  - 42
KW  - 
UR  - https://doi.org/10.1071/MF9940035 
N2  - Seasonal, diel and tidal cycles of beam-trawl catches of juvenile tiger prawns, Penaeus semisulcatus, from an intertidal seagrass bed in the Embley River, Gulf of Carpentaria, were studied at three-week intervals between August 1981 and August 1982. Two seasonal peaks in catches of P. semisulcatus were recorded around November and April. Split-plot analysis of variance showed that after seasonal variation was removed, catches were influenced by day-night and tidal cycles. Few P. semisulcatus juveniles were caught during the day, and more were caught around low tide than around high tide. Results from drop-trap sampling at low tide showed that juvenile P. semisulcatus remained in the seagrass bed even when it became exposed and the water temperature exceeded 35&#176;C. These findings, and practical considerations, suggest that to study long-term changes in relative abundance of juvenile P. semisulcatus with beam trawls, sampling should be completed at night and during the early part of the flood tide. 
ER  -

