An inexpensive system for underwater video surveys of demersal fishes

Schaner, Ted; Fox, Michael G.; Taraborelli, Ana Carolina

doi:10.1016/j.jglr.2008.12.003

Cited by 16 publications

(14 citation statements)

References 4 publications

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“…Because we were less certain counting and measuring small juvenile fish (\3 cm), similar to other studies using video analysis (e.g. Schaner et al 2009), we feel our density estimates emphasize adult populations and underestimate total round goby populations.…”

Section: Secondary Invasion Of Inland Waters 1163mentioning

confidence: 59%

Low dissolved ions may limit secondary invasion of inland waters by exotic round gobies and dreissenid mussels in North America

et al. 2011

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Round gobies and dreissenid mussels, exotic species in the North American Great Lakes basin, are euryhaline organisms whose geographic spread and ecological impacts in freshwaters may be limited by low levels of dissolved ions such as calcium (Ca). We measured source populations of these exotics in the St. Lawrence River and found population densities of dreissenids (range of *1,000-6,400 individuals m -2 ) and round gobies (6-32 individuals m -2 ) similar to those in other Great Lake locations from which they have spread inland. However, we found little evidence for their secondary invasion of inland tributary rivers and lakes of northern New York State. Using natural waters collected from inland ecosystems, we ran laboratory bioassays of reproduction, growth, and survival of several life stages of zebra and quagga mussels as well as the round goby. We found little difference in the responses of zebra and quagga mussels, with each species showing moderate reproductive success, growth, and survival at Ca concentrations [ 13 mg L -1 and dramatic improvements at[18 mg L -1 . Round gobies showed moderate survival in waters with Ca concentrations [ 8 mg L -1 and high survival [ 18 mg L -1 . These bioassays are the first such experiments for quagga mussels and round gobies and show how all three species may be similarly restricted in their ability to invade and permanently colonize significant geographic regions of New York State and perhaps the US.

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Section: Secondary Invasion Of Inland Waters 1163mentioning

confidence: 59%

Low dissolved ions may limit secondary invasion of inland waters by exotic round gobies and dreissenid mussels in North America

et al. 2011

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“…The underwater video camera used in the current study is adequate for detecting medium to large-bodied gobies, but is deficient at detecting individuals smaller than 50-mm TL (Schaner et al, 2009). To sample a greater array of size-classes, we recommend that another method be deployed (e.g.…”

Section: Discussionmentioning

confidence: 99%

Occupation, body size and sex ratio of round goby (Neogobius melanostomus) in established and newly invaded areas of an Ontario river

Gutowsky

Fox

2011

Hydrobiologia

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Invasive species represent a challenge because the particular characteristics of a species' invasion are often unknown before the invasion. To provide some clarity as to how invasive species demographic structure might change as a population advances its range, we compared the proportion of occupied sites, size structure and sex ratio of round gobies in the area where they first invaded with more recently invaded areas at the extent of their range in a river in south-eastern Ontario. We used a standardized angling technique to sample gobies larger than 45-mm total length in the summer and early autumn of 2007. Round goby at the upstream and downstream extent of their range occupied a lower proportion of randomly selected sites, and contained a wider distribution of sizes as well as significantly larger individuals. Sex ratios in all areas were malebiased and the male-to-female ratio was significantly higher in the upstream segment of the river (2.2:1) compared to the area of first introduction (1.4:1). The difference between the newly invaded and the established sites suggests that round goby population structure may be affected by density. The results of this study help us further describe the demographic characteristics of biological invasions whilst examples of population structure and behaviour in gobies and other species provide a basis for generating hypotheses for range expansion.

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“…The round goby (Neogobius melanostomus) is a demersal fish that originates in the Ponto-Caspian region and is now found in the Laurentian Great Lakes and a number of their tributaries. The invasion of this fish prompted research efforts to assess population densities, and techniques have included trawling (OMNR, 2005), seining and visual estimation with SCUBA (Schaner et al, 2009), a remotely operated vehicle , snorkelling transects (Ray and Corkum, 2001) and a boat mounted underwater camera apparatus (Schaner et al, 2009). Despite the advantages presented by each technique and their practicality under particular environmental conditions, each technique is severely limited by high cost, capture inefficiency and/or limited ability of use in certain habitats occupied by the species Schaner et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…The invasion of this fish prompted research efforts to assess population densities, and techniques have included trawling (OMNR, 2005), seining and visual estimation with SCUBA (Schaner et al, 2009), a remotely operated vehicle , snorkelling transects (Ray and Corkum, 2001) and a boat mounted underwater camera apparatus (Schaner et al, 2009). Despite the advantages presented by each technique and their practicality under particular environmental conditions, each technique is severely limited by high cost, capture inefficiency and/or limited ability of use in certain habitats occupied by the species Schaner et al, 2009). In an attempt to quantify round goby density in the Trent River, Ontario, we initially utilized the underwater camera apparatus that worked well in the Bay of Quinte (Schaner et al, 2009); however the large, angular rocks in the channel made it difficult to detect gobies, and the variable current and high boat traffic made it difficult to maintain a steady course in this river.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the advantages presented by each technique and their practicality under particular environmental conditions, each technique is severely limited by high cost, capture inefficiency and/or limited ability of use in certain habitats occupied by the species Schaner et al, 2009). In an attempt to quantify round goby density in the Trent River, Ontario, we initially utilized the underwater camera apparatus that worked well in the Bay of Quinte (Schaner et al, 2009); however the large, angular rocks in the channel made it difficult to detect gobies, and the variable current and high boat traffic made it difficult to maintain a steady course in this river. To suit these conditions, we developed an angling technique to produce density estimates using the principles of the depletion method (Zippin, 1958;Carle and Strub, 1978).…”

Section: Introductionmentioning

confidence: 99%

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