Field data from artificial habitats deployed in Florida Bay during the 2003 spawning season of Opsanus beta
| . | Sample date . | . | |
|---|---|---|---|
| . | 24 April 2003 . | 15 May 2003 . | |
| Number of habitats surveyed | 41 | 42 | |
| Toadfish occupancy of habitats (%) | 87.8 | 64.3 | |
| Salinity (‰) | 33.8±0.3 | 33.3±0.2 | |
| Depth (cm) | 108±5.0 | 120±5.0 | |
| pH | 8.55±0.02 | 8.44±0.02 | |
| Temp (°C) | 29.3±0.2 | 32.1±0.2 | |
| Adult TL (mm) | 164.5±5.6 | 167.6±4.6 | |
| Adult sex (% male in habitats) | 85.7 | 100.0 | |
| Occupied habitats with offspring (%) | 96.4 | 84.0 | |
| Nest water urea-N (μmol N l-1) | 17.1±2.6 | 11.1±1.8 | |
| Nest water NH4-N (μmol N l-1) | 8.1±1.0 | 9.7±1.5 | |
| Percent ureotelic* (%) | 63.4±3.5 | 54.0±4.1 | |
| Adult toadfish with food in GI tract (%) | 3.6 | 8.0 | |
| . | Sample date . | . | |
|---|---|---|---|
| . | 24 April 2003 . | 15 May 2003 . | |
| Number of habitats surveyed | 41 | 42 | |
| Toadfish occupancy of habitats (%) | 87.8 | 64.3 | |
| Salinity (‰) | 33.8±0.3 | 33.3±0.2 | |
| Depth (cm) | 108±5.0 | 120±5.0 | |
| pH | 8.55±0.02 | 8.44±0.02 | |
| Temp (°C) | 29.3±0.2 | 32.1±0.2 | |
| Adult TL (mm) | 164.5±5.6 | 167.6±4.6 | |
| Adult sex (% male in habitats) | 85.7 | 100.0 | |
| Occupied habitats with offspring (%) | 96.4 | 84.0 | |
| Nest water urea-N (μmol N l-1) | 17.1±2.6 | 11.1±1.8 | |
| Nest water NH4-N (μmol N l-1) | 8.1±1.0 | 9.7±1.5 | |
| Percent ureotelic* (%) | 63.4±3.5 | 54.0±4.1 | |
| Adult toadfish with food in GI tract (%) | 3.6 | 8.0 | |
Samples were only collected from a representative number of occupied shelters (4-5 per cluster) during midday hours while the remainder was left undisturbed. Salinity and depth were measured only once per cluster of toadfish shelters (N=6).
Values are means ± s.e.m. unless otherwise stated(N=26 on 24 April and N=25 on 15 May).
Defined as the percentage of waste-N occurring as urea-N.