Such data could lead to specific spatial and temporal fishing regulations aimed at stock-specific sustainable harvest rates.
Modeling a temporal fishing moratorium with a focus on stock recovery, Enberg et al. (2009) show how these processes have different time scales and different consequences.
This study thus highlights the importance but also the difficulty of implementing spatio-temporal fishing regulations over a large geographical scale and suggests that modification of fishing gears and fishing behaviours might be more efficient to protect such highly migratory species.
The objectives of this paper are (1) to present VideoSolo, a new autonomous video system; and (2) to show its relevance through the analysis of temporal variability of fish populations at different temporal scales of years, days and hours.
Specific hydraulic thresholds (e.g. thalweg flow depths at riffle crests) and food web structure will be evaluated numerically and and assessed as predictor variables for spatial and temporal variation in fish growth, habitat (riffle versus mainstem) choices, diet, and feeding and antagonistic behavior.
This study shows that large scale monitoring and sampling programmes using baited cameras need to consider the possible influence of within and between day variability in their experimental designs and must carefully design sampling to test for spatial and temporal structures in fish assemblages.
Cross- and autocorrelation analysis showed that estimates from the first and second 10-min samples were similar (r = 0.65) and variation between them (i.e., within the hour) was random, supporting the conclusion that systematic-hourly sampling is a defensible sampling design for acoustic enumeration when temporal variation in fish migration is unknown a priori.
In carrying out this study, we tried to answer the following question: does the spatial and temporal distribution of fish communities in the creek resemble those of other Afrotropical regions?
This is particularly important if temporal changes in fish population and community data are to be reliably estimated [12].
Anthropogenic activities have greatly increased reactive nitrogen inputs to aquatic ecosystems, which has led to numerous eutrophication problems such as harmful phytoplankton blooms, temporal hypoxia and fish death [1].
