Comparison of Three Methods for Sampling Fishes and Macroinvertebrates in a Vegetated Freshwater Wetland

Freeman, Byron J.; Greening, Holly; Oliver, J. Douglas

doi:10.1080/02705060.1984.9664643

Cited by 37 publications

(32 citation statements)

References 6 publications

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“…Five sweeps of the bar seine collected most organisms within the throw trap ( Table 2). Use of the bar seine to clear the throw trap required less time (about 5 min) than that reported when using either rotenone and dip nets (Wegener et al 1973, Weinstein & Brooks 1983 or a smaller clearing net (Freeman et al 1984). Yet, the efficiency of the bar seine for the 4 most numerous species was greater than the 90 O/O efficiency reported by Freeman et al (1984).…”

Section: Discussionmentioning

confidence: 87%

Fish and macrocrustacean use of submerged plant beds in tidal freshwater marsh creeks

Rozas¹,

Odum²

1987

Mar. Ecol. Prog. Ser.

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Fishes and macrocrustaceans (nekton) were sampled biweekly from mid-June through October 1985 from submerged aquatic vegetation (SAV) and during September 1985 from unvegetated areas of tidal freshwater marsh creeks. Nineteen species of fishes (6918 individuals, 3.068 kg preserved wet weight) from 9 famhes, and 3 species of invertebrates (12036 individuals, 1.577 kg preserved wet weight) were collected from SAV The most abundant species were grass shrimp Palaemonetes pugio, banded killifish Fundulus diaphanus, mummlchogs F. heteroclitus, bluespotted sunfish Enneacanthus gloriosus, and mud crabs Rhithropanopeus harrisj:. Recruitment of small juvenile fishes of several species coincided with the period of greatest SAV area1 cover (late June through September). Average densities of fauna were significantly greater in SAV than over nearby unvegetated creek bottoms in September. Fauna1 abundance was not significantly related to SAV biomass, perhaps because the structural complexity of the SAV in our study area was high and nekton were abundant when SAV was present at low densities (i.e. low biomass). The numerically dominant species that occurred in SAV at low tide and on the marsh surface at high tide were similar Grass shrimp, banded lullifish, mummichogs and bluespotted sunfish accounted for > 90 % of the total number of organisms collected in each of the 2 habitats, SAV and marsh surface. The SAV of tidal freshwater marsh creeks is probably most important as habitat for forage fishes. Young of recreational species such as bluegill Lepomis macrochirus and pumpkinseed L. gibbosus also occupy this habitat.

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Section: Discussionmentioning

confidence: 87%

Fish and macrocrustacean use of submerged plant beds in tidal freshwater marsh creeks

Rozas¹,

Odum²

1987

Mar. Ecol. Prog. Ser.

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“…The absolute efficiency of drop traps can be estimated in shallow block net separated areas with known fish densities (Kushlan 1981;Jordan et al 1997), and they have often been used to estimate the relative efficiency of seines and trawls (Freeman et al 1984;Dewey et al 1989;Wennhage et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Comparison of an enclosure drop trap and a visual diving census technique to estimate fish populations in eelgrass habitats

Bobsien

Brendelberger

2006

Limnology & Ocean Methods

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In shallow vegetated aquatic habitats exceeding 2 m depth, conventional methods to determine fish abundances are of limited success. In this study, the sampling qualities of 2 methods for investigating the fish community associated with the eelgrass Zostera marina were tested: a newly developed enclosure drop trap (ET) operated from the water surface and a visual diving strip transect technique. The construction and the sampling procedure of the enclosure trap are described in detail. Both sampling procedures were performed simultaneously at the same eelgrass sampling site at depths between 2 and 5 m. The comparison revealed deficiencies in relative catch efficiency for both methods. Limitations with respect to bottom-dwelling forms are obvious for the ET and with respect to the Syngnathidae and Gasterosteidae for the visual diving census. Abundance estimates of pelagic, schooling species were highly variable with both methods. Correction coefficients for the different behavioral categories of eelgrass fish were calculated. The fish species composition showed good agreement between the 2 methods, but the number of species on each sampling occasion was consistently higher in the ET catches. The length class frequency distributions estimated by the divers corresponded approximately with direct measurements of fish from the ET catches. The methods complemented one another and can be recommended for simultaneous deployment to get accurate quantitative estimates of eelgrass fish populations. The relative capture efficiency of the enclosure trap can be incorporated to improve abundance measurements of small fish in Zostera marina beds without the help of divers.

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“…This method is adequate od requires that cohorts develop relatively for sampling individual > 15-mm standard synchronously. Total production was estilength; capture efficiency of marked fish re-mated for each species by summing proleased into traps during sampling was 90% duction between collections made from Au- (Freeman et al 1984). Smaller individgust 1982 through October 1983.…”

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confidence: 99%

“…The bottom is composed of soft peat (depth to > 1 m); water levels may fluctuate from < 10 cm in fall to > 55 cm in spring, and water temperatures can range from 0" to 40°C. Fishes were sampled about every 6 weeks tions as a product of mean standing stock (Freeman et al 1984) from August 1982 biomass and instantaneous growth rate durthrough October 1983 with a 1 -m2 drop trap.…”

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confidence: 99%

Production of fishes in a subtropical blackwater ecosystem: The Okefenokee Swamp1

Freeman

1985

Limnology & Oceanography

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Secondary production by the three dominant fishes inhabiting an acidic macrophyte marsh in the Okefenokee Swamp was 171 kg wet wt ha−1 yr−1. Production was estimated by the instantaneous growth rate and size‐frequency methods. The size‐frequency method gave higher, presumably more accurate, estimates because it is not affected by nonsynchronous cohort development; also, densities of small, undersampled, individuals could be back‐calculated from densities in larger size classes. This estimated production exceeds many values reported for stream and river habitats. It is suggested that such blackwater dystrophic habitats are more productive than previously thought.

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Comparison of Three Methods for Sampling Fishes and Macroinvertebrates in a Vegetated Freshwater Wetland

Cited by 37 publications

References 6 publications

Fish and macrocrustacean use of submerged plant beds in tidal freshwater marsh creeks

Fish and macrocrustacean use of submerged plant beds in tidal freshwater marsh creeks

Comparison of an enclosure drop trap and a visual diving census technique to estimate fish populations in eelgrass habitats

Production of fishes in a subtropical blackwater ecosystem: The Okefenokee Swamp1

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