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1 January 2007 Summer Nocturnal Patterns in Freshwater Drum (Aplodinotus grunniens)
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Abstract

We observed diel patterns in CPUE, size and age-structure for freshwater drum (Aplodinotus grunniens) from Alabama waters during May–July 2003 . Drum were significantly more susceptible to capture along shoreline habitat at night. CPUE of freshwater drum was often zero during the day and increased up to 84.5 fish * h−1 at night suggesting that many drum shift location to nearshore habitat after dark. Drum captured at night were also significantly smaller and younger that drum captured during the day. Age-0 drum were the most abundant age-class in nighttime samples whereas age-8 drum were the most abundant age-class in daytime samples. The dynamic interplay between food availability and predation on juvenile fish likely drives diel habitat shifts of freshwater drum.

ANDREW L. RYPEL and JUSTIN B. MITCHELL "Summer Nocturnal Patterns in Freshwater Drum (Aplodinotus grunniens)," The American Midland Naturalist 157(1), 230-234, (1 January 2007). https://doi.org/10.1674/0003-0031(2007)157[230:SNPIFD]2.0.CO;2
Received: 23 May 2005; Accepted: 1 June 2006; Published: 1 January 2007
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