Less effort but equal result: Introducing the daily run-size estimation method for quantifying fish passage in fishways

Abstract

Determining the number of fish that use a fishway is essential to fisheries management but counting all fish can be impracticable due to labor and cost. We present the daily run-size estimation (DARSE) method, which uses systematic sampling to estimate the number of fish per species that pass through a fishway daily (daily run size, D). The DARSE method makes it possible to determine the minimum fraction of each hour (or hourly samples) of the day necessary to estimate D with known accuracy. We apply DARSE to each of the seven most abundant fish species (other species grouped under ‘Others’) recorded in video images taken during 46 days of one year at the Igarapava Fish Ladder, Brazil. Accuracy in estimating D was influenced by the fraction of the hour sampled and the temporal pattern of fish passage through the fishway. For species with a more uniform temporal pattern of passage, the DARSE method reduced the time spent on sampling by up to 96%, depending on the accuracy used to estimate D. Some of these species required counts of fish that pass in a fraction of an hour for all hours of the day while counts for other species can be done every 2 hours or, more rarely, every 3 hours. For species with a more aggregated temporal pattern of passage, it was possible to estimate D by sampling a fraction of an hour but with reduced accuracy in the estimation of D and little reduction in sampling time.

Laboratory Investigation of Hydraulic Parameters on Inclined Drop Equipped with Fishway Elements

“…Therefore, according to the above results, if the purpose of using fishway elements is energy dissipation, non-hole elements are more suitable due to increased energy dissipation; however, if the purpose of designing these elements is also environmental issues, hole elements are recommended because of the presence of a hole, the movement of fish and aquatic animals through these pores is much easier and more minor damage is done to aquatic animals [41][42][43]. Therefore, according to the above results, if the purpose of using fishway elements is energy dissipation, non-hole elements are more suitable due to increased energy dissipation; however, if the purpose of designing these elements is also environmental issues, hole elements are recommended because of the presence of a hole, the movement of fish and aquatic animals through these pores is much easier and more minor damage is done to aquatic animals [41][42][43].…”

“…According to Figure 3c, the use of fishway hole elements increases the energy dissipation rate by 40.31% compared to the inclined gabion. Therefore, according to the above results, if the purpose of using fishway elements is energy dissipation, non-hole elements are more suitable due to increased energy dissipation; however, if the purpose of designing these elements is also environmental issues, hole elements are recommended because of the presence of a hole, the movement of fish and aquatic animals through these pores is much easier and more minor damage is done to aquatic animals [41][42][43].…”