Accuracy of fish population estimates in a navigation canal with heavy traffic

Penczak, T.; O’Hara, K.

doi:10.1016/s0165-7836(98)00077-0

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…We must question the significance of the accuracy of these results, because numerous tables featuring the results of calculations are printed in these papers, and the publisher's authorization is required for repeated printing (Penczak & O'Hara 1983, 1998Frankiewicz et al 1986, Penczak et al 1997). In the study by Penczak et al (1997), it was shown that a lower efficiency for benthic species was correlated according to increasing obstacles on the bottom of some natural rivers, yet every sampling method has some disadvantages (Casselman et al 1990).…”

Section: Resultsmentioning

confidence: 99%

“…Sampling procedures with identical three seine nets hauled individually towards a stop net or a bank were described and presented in figures and photos in former papers (Penczak & O'Hara 1983, Frankiewicz et al 1986, Penczak et al 1997, Penczak & O'Hara 1998. For the density calculation, the Zippin model was applied in the above papers Photo 1.…”

Section: Sampling Methodsmentioning

confidence: 99%

“…We used the TSNT sampling technique in the Weaver River (England), the Ivai River (Parana), the heavily trafficked Shropshire Union Canal (England), and the littoral part of the Sulejów Reservoir (Poland) (Penczak & O'Hara 1983, Penczak et al 1997, Penczak & O'Hara 1998, Frankiewicz et al 1986). For the above research, we used small mesh (1.5 -4.0 mm) knotless netting material.…”

Section: Study Areamentioning

confidence: 99%

“…After laying all three nets on the bank they were drawn simultaneously into the water to form closed semicircular areas. Each net was then alternately hauled back onto the bank (Penczak & O'Hara 1983, Frankiewicz et al 1986, Penczak et al 1997 or on the stop net (Penczak & O'Hara 1998). Modifications with net dimensions and sampling techniques were related to sampled water bodies, and detailed descriptions are available in the four cited papers.…”

Section: Study Areamentioning

confidence: 99%

“…As three samples are an absolute minimum for any accurate estimate employing a removal technique (Raleigh & Short 1981), this procedure provides an estimate of density with a known error because it allows for calculations of the variance value for calculated density. We used the TSSN sampling technique in two rivers (Penczak & O'Hara 1983, Penczak et al 1997), a heavily trafficked navigation canal (Penczak & O'Hara 1998), and the littoral part of a reservoir (Frankiewicz et al 1986). In all of the conducted catches the efficiency of the first catch was in the range 100-60 (40)% in relation to the calculated density (Table 1), despite some obstacles (branches, trunks, submerged plant clumps, stones).…”

Section: Introductionmentioning

confidence: 99%

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Species density obtained for fish sampled with three seine nets hauled individually towards a stop net or a bank

Penczak

2013

Oceanological and Hydrobiological Studies

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Researchers continuously search for adequate and inexpensive fish sampling methods and, as such, it is worth remembering the quantitative seine method with three identical nets hauled individually towards a stop net or a bank. A sample obtained by three nets is the absolute minimum for any accurate estimate employing a removal technique, and this procedure provides an estimate of density with a known error, because it allows for calculations of the variance value. Density (the number of individuals calculated from the model, as per defined area or volume), a popular term in the previous century when a secondary production and bioenergetics budget studies were considered to be modern investigations, but now when it is used with different meanings, an attempt has to be undertaken to sort out this terminology.*

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Section: Resultsmentioning

confidence: 99%

Section: Sampling Methodsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Species density obtained for fish sampled with three seine nets hauled individually towards a stop net or a bank

Penczak

2013

Oceanological and Hydrobiological Studies

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Penczak

O’Hara²,

Kostrzewa

2002

Hydrobiologia

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Evaluation of electrofishing efficiency in a stream under natural and regulated conditions

Penczak

2008

Aquat. Living Resour.

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-Sampling efficiency (p), estimated from the Zippin depletion model and the percentage of fish obtained during first runs (single-pass electrofishing), which is also named relative abundance (C 1 ), calculated as the ratio of C 1 to estimated density for a site (C e ), were analysed in five contiguous sites in a small lowland stream in Poland over 23 years. The sampled reach was unregulated during the first decade of the study period, but regulated by weirs and sluices in the latter 13 years. The sites were populated with 17 fish species during this period. Sampling efficiency p calculated for all species did not differ significantly between the five sites in any given year, between benthic and non-benthic species, or between the natural and regulated periods. Differences in p were only observed between some species. C 1 differed significantly between large and small species and, except for roach, was not dependent on the number of runs. Results indicate a high stability of both sampling indices in this small stream, despite changes in channel morphology after regulation: information which could be useful for future sampling research in streams.Key words: Lowland stream / Natural / Regulated / Electrofishing efficiency / Relative abundance Résumé -Evaluation de l'efficacité de la pêche électrique en rivière en conditions naturelles et en débit régulé. L'efficacité de l'échantillonnage (p), estimée à partir du modèle de Zippin et le pourcentage de poissons obtenu durant les premiers passages, appelé aussi abondance relative (C 1 ), calculée comme le rapport de C 1 à la densité estimée pour un site (C e ), ont été analysés en cinq sites contigus, dans une petite rivière de plaine, en Pologne, sur une période de 23 ans. Le bief échantillonné était non-régulé durant les dix premières années de l'étude, puis régulé au moyen de barrages et chenaux, les treize années suivantes. Les sites étaient peuplées de 17 espèces de poissons durant cette période. L'efficacité p calculée pour toutes les espèces ne diffère pas entre les cinq sites et quelle que soit l'année, entre espèces benthiques ou non-benthiques, ou entre les périodes de régulation ou non. Des différences de p sont seulement observées entre quelques espèces. C 1 diffère significativement entre grandes et petites espèces, à l'exception du gardon, sans être dépendant du nombre de passages. Les résultats indiquent une grande stabilité des deux indices d'échantillonnage dans cette rivière, en dépit du changement de morphologie du cours d'eau après la régulation : des informations qui peuvent être utiles pour de futurs travaux relatifs à l'échantillonnage des cours d'eau.

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Accuracy of fish population estimates in a navigation canal with heavy traffic

Cited by 3 publications

References 7 publications

Species density obtained for fish sampled with three seine nets hauled individually towards a stop net or a bank

Species density obtained for fish sampled with three seine nets hauled individually towards a stop net or a bank

Untitled

Evaluation of electrofishing efficiency in a stream under natural and regulated conditions

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