Comparing on site human and video counts at Igarapava fish ladder, south eastern Brazil

Author:

Bowen Mark D.1,Marques Simone2,Silva Luiz G. M.2,Vono Volney2,Godinho Hugo P.3

Affiliation:

1. US Bureau of Reclamation, USA

2. UFMG, Brazil

3. Pontificia Universidade Católica de Minas Gerais, Brazil

Abstract

On site human observations and video images were collected and compared at the window of the Igarapava Dam fish ladder (IDFL), rio Grande , Southeastern Brazil, between March 1st and June 30th, 2004. We conducted four experiments with two humans (Observer 1 and Observer 2) observing fish passage in the IDFL window while a Sony 3CCD video camera (Observer 3) recorded fish passage at the same time. Experiments, each one hour in length, were distributed throughout the diel cycle using full spectrum lights. We identified fish species, the number of individuals for each species, and the real time that they passed. Counts from each human observer were compared to the video counts. The fish species most commonly observed in the window were - curimba (Prochilodus lineatus), mandi-amarelo (Pimelodus maculatus), piau-três-pintas (Leporinus friderici) and ferreirinha (Leporinus octofasciatus). The number of species and individuals were indistinguishable for the three observers. But, the number of species and individuals were significantly different among experiments. Thus, the three observers register the same number of species and count the same number of individuals even when these two response variables differ significantly among experiments. Based on these results, we concluded that the video count was an accurate method to assess fish passage at the IDFL.

Publisher

FapUNIFESP (SciELO)

Subject

Aquatic Science,Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

Reference11 articles.

1. Fisheries management in Brazilian reservoirs: lessons from/for South America;Agostinho A. A.;Interciencia,2004

2. Normative instruction no. 5, May 21, 2004: National list of threatened and overexploited aquatic species;Official Diary

3. Estimation of Pacific salmon escapement with a time-lapse video recording technique;Hatch D. R.;North American Journal of Fisheries Management,1994

4. A computerized editing system for video monitoring of fish passage;Hatch D. R.;North American Journal of Fisheries Management,1998

5. Anadromous salmonid passage and video image quality under infrared and visible light at Prosser Dam Fish Ladder, Yakama River, Washington;Hiebert S.;North American Journal of Fisheries Management,2000

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