Relevant bibliographies by topics / Giant kokopu

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Academic literature on the topic 'Giant kokopu'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Giant kokopu"

1

Bonnett, Martin L., and Paul W. Lambert. "Diet of giant kokopu,Galaxias argenteus." New Zealand Journal of Marine and Freshwater Research 36, no. 2 (June 2002): 361–69. http://dx.doi.org/10.1080/00288330.2002.9517093.

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2

M. J, Wylie. "REPRODUCTIVE BIOLOGY OF GIANT KOKOPU, GALAXIAS ARGENTEUS." Indian Journal of Science and Technology 4, si1 (June 20, 2011): 102–3. http://dx.doi.org/10.17485/ijst/2011/v4is.70.

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Bonnett, Martin L., and Julian R. E. Sykes. "Habitat preferences of giant kokopu,Galaxias argenteus." New Zealand Journal of Marine and Freshwater Research 36, no. 1 (March 2002): 13–24. http://dx.doi.org/10.1080/00288330.2002.9517067.

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Hansen, Eric A., Bruno O. David, and Gerard P. Closs. "Diel patterns of feeding and prey selection in giant kokopu (Galaxias argenteus)." New Zealand Journal of Marine and Freshwater Research 38, no. 2 (June 2004): 341–45. http://dx.doi.org/10.1080/00288330.2004.9517242.

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5

Baker, Cindy F., and Joshua P. Smith. "Habitat use by banded kokopu(Galaxias fasciatus)and giant kokopu(G. argenteus)co‐occurring in streams draining the Hakarimata Range, New Zealand." New Zealand Journal of Marine and Freshwater Research 41, no. 1 (March 2007): 25–33. http://dx.doi.org/10.1080/00288330709509893.

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6

Whitehead, A. L., B. O. David, and G. P. Closs. "Ontogenetic shift in nocturnal microhabitat selection by giant kokopu in a New Zealand stream." Journal of Fish Biology 61, no. 6 (December 2002): 1373–85. http://dx.doi.org/10.1111/j.1095-8649.2002.tb02483.x.

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7

BARRY, B., A. MARKWITZ, G. CLOSS, B. DAVID, and L. CHADDERTON. "EVIDENCE FOR GIANT KOKOPU MIGRATION BETWEEN FRESHWATER ENVIRONMENTS FROM MICROPIXE MEASUREMENTS OF SR IN OTOLITHS." International Journal of PIXE 15, no. 03n04 (January 2005): 139–45. http://dx.doi.org/10.1142/s0129083505000441.

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The giant kokopu, Galaxias argenteus, is a native New Zealand freshwater fish which optionally undergoes a marine larval phase after hatching near a river mouth. The marine phase is indicated by a high Sr : Ca ratio in the core of the otolith of the adult fish. Elemental scanning for Sr and Ca with a proton microprobe is one of the most useful techniques for identifying and quantifying the presence of the marine core. However, many individuals, whether or not they show the marine core, exhibit one or more concentric rings of slightly elevated Sr levels outside the core. Examples of this behaviour are given and quantitative estimates of the degree of elevation of the Sr levels are made from both area and line scans using high efficiency detectors for Sr detection. It is suggested that these Sr variations reflect adult fish migration within a freshwater habitat, perhaps seeking a brackish zone in which to spawn.
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Pearce, Johnston, Armagan Sabetian, Liz-Marie Keyser, Sheng Wang, and Jun Lu. "Assessing sperm membrane viability using flow cytometry in farmed New Zealand giant kokopu Galaxias argenteus." New Zealand Journal of Marine and Freshwater Research 52, no. 3 (November 2, 2017): 362–71. http://dx.doi.org/10.1080/00288330.2017.1394883.

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9

Lulijwa, Ronald, Andrea C. Alfaro, Tim Young, Leonie Venter, Paul Decker, Fabrice Merien, and Jill Meyer. "Effect of anticoagulants on farmed giant kokopu, Galaxias argenteus (Gmelin 1789) haematological parameters and erythrocyte fragility." Journal of Fish Biology 99, no. 2 (May 6, 2021): 684–89. http://dx.doi.org/10.1111/jfb.14746.

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10

Wylie, M. J., E. L. Forbes, and P. M. Lokman. "Ovarian biopsy: a non-terminal method to determine reproductive status in giant kokopu,Galaxias argenteus(Gmelin 1789)." New Zealand Veterinary Journal 61, no. 5 (September 2013): 292–96. http://dx.doi.org/10.1080/00480169.2012.740657.

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Dissertations / Theses on the topic "Giant kokopu"

1

Aldridge, Brenda Michelle Te Aroha. "Restoring giant kokopu (Galaxias argenteus) populations in Hamilton's urban streams." The University of Waikato, 2008. http://hdl.handle.net/10289/2516.

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In this study, options for restoring fish populations in Hamilton City (37.47'S, 175.19'E) were explored. Habitat and fish populations in Hamilton urban streams were manipulated using a two-fold experimental design. Firstly, habitat was enhanced in ten urban streams with three continuous treatments in a 60-m reach at each site (20 m with 10 ponga logs, 20 m with 20 hollow clay pipes, and 20 m with no added structure). Secondly, juvenile farm-reared giant kokopu (Galaxias argenteus), were stocked into five of the enhanced stream sections. Giant kokopu are threatened and occur naturally in Hamilton urban streams in sparse populations. The abundance of wild fish was monitored before and after enhancement and fish release from November 2006 to November 2007. Stocked fish were monitored for eight months, from April to November 2007. Over this time electric fishing was conducted three times, trap nets (Gee minnow and fyke nets) were set monthly and spotlighting was conducted monthly at three release sites where water clarity allowed. Anticipated outcomes of this research were; to determine whether giant kokopu abundance in Hamilton urban streams is limited by recruitment or by habitat, and to assist with the development of methods to restore fish populations in Hamilton City urban streams. Logs used as enhancement structures in Hamilton urban streams provided more stable habitat for fish and created more suitable microhabitat than pipe structures. Pipes moved considerably during high flows, and their instability made them less effective at providing habitat. Within the study sites there appeared to be complex interactions with turbidity, stream width and depth, which complicated the effect of the habitat structures. The limited replication and variability among sites contributed to statistically insignificant results using analysis of variance. Retention and recapture rates of stocked juvenile giant kokopu were greatest at Site M11, where the stream was narrow, shallow, clear and had lower numbers and biomass of shortfin eels, compared to other survey sites. Marked and released giant kokopu were retained in the release reaches at four of the five sites, for a minimum of four months, and exhibited substantial growth. Daily growth of juvenile giant kokopu ranged from 0.19 to 0.33 mm day-1 and from 0.03 to 0.11 g day-1, exhibiting substantial growth over winter. Giant kokopu appeared to have a slight bias to the log section of enhanced habitat, but habitat selection appeared to be overwhelmingly controlled by initial habitat selection. The stocking of farm-reared fish into urban streams was largely successful, but the success of the habitat enhancement was variable and further work is required to determine better techniques for habitat enhancement in these urban environments. It is concluded that releasing farm-reared giant kokopu can be used to restore populations especially where recruitment limitations control fish abundance and diversity.
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2

Bonnett, Martin Lee. "Critical habitat features of giant kokopu, Galaxias argenteus (Gmelin 1789)." Thesis, University of Canterbury. Zoology, 2000. http://hdl.handle.net/10092/6892.

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The giant kokopu (Galaxias argenteus) is the largest of the galaxiid fishes, and is endemic to New Zealand. Some landlocked (non-migratory) populations exist, but giant kokopu are normally diadromous, and juveniles make up a small part of the annual whitebait run. The species is now regarded as threatened, and its rarity has led to controversy over proposed changes to whitebait fishing regulations. Although exploitation of the juveniles may be limiting recruitment to adult populations, the perceived decline of giant kokopu has been attributed mostly to the loss and degradation of its habitat. In order to manage and conserve the species, the critical features of giant kokopu habitat need to be determined. Analysis of information from the New Zealand Freshwater Fisheries database, and from field surveys in Southland and along the western coast of the South Island, indicate that five habitat features are critical: the presence of instream cover, deep water, low water velocity, proximity to the sea, and overhead shade/riparian cover. These features were critical in both regions surveyed and for both juvenile and adult fish. The effects of different types of riparian and in stream cover were examined, but it appeared that the presence of some sort of cover was more important than its composition. Giant kokopu readily utilised artificially constructed habitat, which emphasised the importance of instream cover and low water velocity. Diet was investigated from the examination of the gut contents of 105 fish, and results compared to other published information. Giant kokopu are probably best described as opportunistic feeders, as they utilise a wide range of foods of both aquatic and terrestrial origin. Terrestrial components of the diet appear to be significant for giant kokopu, which may partly explain the importance of overhead shade and riparian cover in giant kokopu habitat. Giant kokopu have been found in a wide variety of water types around New Zealand, and are known to co-occur with 33 other native and introduced species of fish. It appears that they are more likely to occur in habitats where introduced brown trout (Salmo trutta) are absent, although the two species do sometimes co-occur and cannot be said to be mutually exclusive. Migrations of juvenile (whitebait) giant kokopu into freshwater probably occur mostly after the end of the whitebaiting season, and their capture may no longer be a serious conservation concern. The impact of commercial eel fishing on giant kokopu populations is difficult to determine, and there may well be both detrimental and beneficial effects. The conservation and management of giant kokopu will probably continue to be based upon management of their habitat, and these processes will be enhanced by the knowledge of the species' habitat requirements.
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3

Hansen, Eric Allen, and n/a. "Distribution, movement, growth and individual behaviours of a drift feeding stream fish in relation to food supply." University of Otago. Department of Zoology, 2005. http://adt.otago.ac.nz./public/adt-NZDU20060728.142904.

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Individuals within a species often compete for resources in both space and time. In dominance hierarchies individuals with the greatest competitive ability will occupy prime locations during optimal periods to increase efficiency in gathering a resource. Subdominant individuals with low competitive abilities may be forced to reside in habitats of poor quality relative to dominant individuals. In this study I examined the long term patterns of giant kokopu distribution, movement, growth, habitat use, and social interaction between fish in relation to invertebrate drift (food supply). The habitat quality and abundance of food along a one km section of Alex�s Creek was monitored for a two year period. Though the physical structure of Alex�s Creek was relatively homogenous there were significant spatial differences in the density of drifting invertebrates sampled between riffles and pools over this long temporal period. In general, more drifting invertebrates were sampled in riffles of relatively long length and area. Within Alex�s Creek the distribution of giant kokopu, Galaxias argenteus, was determined by patchy distributions of food supply, specific physical factors of pools, and interactions between fish in dominance hierarchies. Over the 20 month study period, the most important biotic factor determining fish biomass was the total number of drifting invertebrates within pools while the most important abiotic factor determining fish abundances within pools was the pool size (surface area). The growth rate of individual fish correspondingly varied between fish residing within pools of different quality. Growth rates were higher for individual fish residing in pools with a relatively high density of drifting invertebrates. The differences in individual growth rates of giant kokopu may determine when fish leave a particular habitat patch (pool) and move to a new one. Fish that moved had lower growth rates (before moving) than fish that remained resident within home pools. Overall the movement of giant kokopu within Alex�s Creek was very restricted due to a relatively consistent distribution of food, however there were differences in the mobility of giant kokopu among different social ranks. The most dominant fish in pools were largely sedentary while fish ranked directly below fish 1 (i.e. fish 2 and 3 in social hierarchies) were relatively mobile. The ability of dominant fish to exclude subdominant fish from the most preferred feeding positions during optimal feeding times had consequences for overall giant kokopu activity. Under normal food supply conditions dominant fish were predominantly nocturnal and maintained large home ranges at night. Conversely subdominant fish occupied large home ranges by day, but were generally not observed at night. When the food supply was limited the utilization of pools was determined by social rank. Dominant fish from each pool increased daytime activity, home range size, aggressiveness, and the capture of food items offered by day while simultaneously reducing the spatial and temporal activity and habitat use of subdominant fish. These results indicate that behavioral changes in large dominant fish influence and reduce the amount of resources available to subdominant fish.
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4

Kokott, Gian-Marco [Verfasser]. "Equilibrium Bidding in Ex-Post Split-Award Auctions / Gian-Marco Kokott." München : Verlag Dr. Hut, 2019. http://d-nb.info/1186453249/34.

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Books on the topic "Giant kokopu"

1

Bonnett, M. L. Critical habitats for the conservation of giant kokopu, Galaxias argenteus (Gmelin, 1789). Wellington, N.Z: Dept. of Conservation, 2002.

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2

New Zealand Large Galaxiid Recovery Plan, 2003-13: Shortjaw Kokopu, Giant Kokopu, Banded Kokopu, and Koaro. Not Avail, 2005.

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Book chapters on the topic "Giant kokopu"

1

"Advances in Fish Tagging and Marking Technology." In Advances in Fish Tagging and Marking Technology, edited by Cindy F. Baker and Joshua P. Smith. American Fisheries Society, 2012. http://dx.doi.org/10.47886/9781934874271.ch12.

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<i>Abstract</i>.—The extent of intra- and inter-stream movements of two large galaxiids, banded kokopu <i>Galaxias fasciatus </i>and giant kokopu <i>Galaxias argenteus</i>, were monitored using a passive integrated transponder (PIT) tag system. In total, 103 banded kokopu and 51 giant kokopu were tagged in three small lowland streams. Within one stream, stationary recording antennae were installed at six locations, and fish movements were monitored for two years. Site fidelity was seen in less than 20% of both kokopu species, with around 40% of both banded and giant kokopu found to frequently undertake intra-stream movements to new cover locations. Movements ranged up to 1000 m for both species with seasonal patterns exhibited. In addition to local movements, inter-stream movements were also recorded in approximately 25% of giant kokopu and 5% of banded kokopu monitored. The extent of intra- and inter-stream movements exhibited by both species highlights the need to consider adult fish migrations in both stream restoration and fish passage design, to ensure upstream and downstream movements of adult galaxiids are unhindered.
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