Movements of Murray cod (<i>Maccullochella peelii peelii</i>) in a large Australian lowland river

Koehn, John D.; McKenzie, John A.; O’Mahony, Damien J.; Nicol, Simon; O’Connor, J. P.; O'Connor, Wendi

doi:10.1111/j.1600-0633.2009.00375.x

Cited by 69 publications

(121 citation statements)

References 49 publications

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“…Crook et al (2001) reported golden perch and carp to use habitats with similar water velocities during the day, but that golden perch used highervelocity areas at night. Nevertheless, the high levels of fidelity shown to these sites (Crook et al 2001;Koehn et al 2008Koehn et al , 2009 indicated their importance as home-habitat areas from which other local movements occur. The preference by trout cod for faster waters reflects the distribution of this species, which was once more widespread, particularly in higher-gradient upland streams (Trueman 2011).…”

Section: Discussionmentioning

confidence: 99%

Comparative habitat use by large riverine fishes

Koehn

Nicol

2014

Mar. Freshwater Res.

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Abstract. The present radio-tracking study compared adult daytime microhabitat use by three large Australian native freshwater fishes (Murray cod, Maccullochella peelii, trout cod, M. macquariensis, golden perch, Maquaria ambigua) and introduced carp, Cyprinus carpio, in the Murray River, south-eastern Australia. The paper describes habitat patches used by all species and quantifies differences among species. All species were strongly associated with structural woody habitat (.68% cover), deeper (.2.4 m), slower water (,0.2 m s À1 ) closer to the river bank, with variations in substrate. Murray cod and trout cod used deeper habitats (2.8 m and 2.9 m, respectively), with higher surface water velocities (0.37 m s À1 and 0.49 m s À1 , respectively) and further from the bank than the habitats of golden perch (2.6 m; 0.31 m s À1 ) or carp (2.4 m; 0.20 m s À1 ), the latter species using wood higher in the water column than did cod species. Trout cod used habitats furthest from the bank and carp those closest. These data provide support and direction for reintroduction of structural woody habitat patches for rehabilitation which, in general, should have .70% cover, be .1.5 m high, located ,15% of the river channel (width) closest to the bank, with surface water velocities of 0.3-0.6 m s À1.

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Section: Discussionmentioning

confidence: 99%

Comparative habitat use by large riverine fishes

Koehn

Nicol

2014

Mar. Freshwater Res.

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“…Murray cod naturally occur in both faster-flowing, cooler, rocky, upstream river reaches and larger, turbid, slower-flowing lowland rivers, with an apparent preference for deep water and habitat with overhanging vegetation and in-stream woody habitat, the latter being important for shelter and spawning (Lintermans et al, 2005). The Murray cod is capable of large migratory and dispersal distances of up to 1500 km, but movements are typically limited to distances o200 km (Koehn et al, 2009). These movements are typically associated with upstream spawning migrations, with subsequent downstream larval drift, and Murray cod tend to exhibit strong site-fidelity outside of the spawning season (Koehn et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…The Murray cod is capable of large migratory and dispersal distances of up to 1500 km, but movements are typically limited to distances o200 km (Koehn et al, 2009). These movements are typically associated with upstream spawning migrations, with subsequent downstream larval drift, and Murray cod tend to exhibit strong site-fidelity outside of the spawning season (Koehn et al, 2009). Spawning is temperature-cued, occurring in spring once temperatures reach 15°C (Koehn and Harrington, 2006).…”

Section: Introductionmentioning

confidence: 99%

Identifying environmental correlates of intraspecific genetic variation

et al. 2016

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Genetic variation is critical to the persistence of populations and their capacity to adapt to environmental change. The distribution of genetic variation across a species' range can reveal critical information that is not necessarily represented in species occurrence or abundance patterns. We identified environmental factors associated with the amount of intraspecific, individual-based genetic variation across the range of a widespread freshwater fish species, the Murray cod Maccullochella peelii. We used two different approaches to statistically quantify the relative importance of predictor variables, allowing for nonlinear relationships: a random forest model and a Bayesian approach. The latter also accounted for population history. Both approaches identified associations between homozygosity by locus and both disturbance to the natural flow regime and mean annual flow. Homozygosity by locus was negatively associated with disturbance to the natural flow regime, suggesting that river reaches with more disturbed flow regimes may support larger, more genetically diverse populations. Our findings are consistent with the hypothesis that artificially induced perennial flows in regulated channels may provide greater and more consistent habitat and reduce the frequency of population bottlenecks that can occur frequently under the highly variable and unpredictable natural flow regime of the system. Although extensive river regulation across eastern Australia has not had an overall positive effect on Murray cod numbers over the past century, regulation may not represent the primary threat to Murray cod survival. Instead, pressures other than flow regulation may be more critical to the persistence of Murray cod (for example, reduced frequency of large floods, overfishing and chemical pollution).

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“…For manual, mobile tracking, a portable receiver and antenna are used. Manual tracking of fish with radio transmitters can be performed by different means of transport such as by boat, foot, car, aircraft and horseback (Östergren and Rivinoja, 2008;Koehn et al, 2009;Gilroy et al, 2010). Manual tracking of fish with acoustic transmitters is best performed by boat since the hydrophone needs to be submerged in water.…”

Section: How To Record Fish Tagged With Radio and Acoustic Transmittersmentioning

confidence: 99%

“…The method is widely used in studies to increase the general knowledge of river migrations of freshwater and diadromous fishes (e.g. Almeida et al, 2002;Hodder et al, 2007;Koehn et al, 2009). It is also widely used to identify migration barriers and evaluate mitigation measures in rivers regulated for hydropower purposes, or impacted by other anthropogenic installations or regulations (e.g.…”

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confidence: 99%

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Thorstad¹,

Rikardsen²,

Alp³

et al. 2014

Turk. J. Fish. Aquat. Sci.

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An overview of electronic tags that can be used in fish research is given, including radio and acoustic transmitters, data storage tags (DST, also termed archival tags), pop-up satellite archival tags (PSAT) and passive integrated transponder tags (PIT-tag). Fish telemetry is a term used to describe the application of these methods. Typically, an electronic tag is attached to a free-swimming fish, and information on position, movements and/or measurements of environmental and physiological parameters can be recorded wirelessly by use of a mobile receiver or stationary loggers. For most methods, the fish need not to be recaptured to achieve data. However, DSTs record and store information on environmental and/or physiological parameters in the tag, and therefore need to be retrieved for downloading data. In the case of PSATs, stored data is transferred to satellites when the tag loosens from the fish and pops up to the surface, and in addition, the pop up position is recorded. The developments of telemetry methods have provided opportunities to reveal previously unknown information on fish behavior, habitat use and migrations in fresh water, estuaries, near-coastal areas and oceans, especially since extensive longterm data can be collected repeatedly from individual fish. Detailed information on fish behaviour and migrations is needed to better understand, protect and manage fishes in freshwater and marine systems. The development of successful management measures depends on knowledge of where fish reside and migrate during the day, season and year. There has been a tremendous increase in the use of electronic tagging methods, especially during the last 10-20 years. In addition to descriptive and ecological studies, the methods have been used to assess effects of for instance hydropower production, other river regulations, migration barriers, protected areas, fishing regulations, catch-and-release angling, hatchery-rearing, fish aggregating devices (FADs), water pollution and aquaculture. The main methods for attaching electronic tags to fish are 1) surgical implantation in the body cavity, 2) external attachment, and 3) gastric insertion via the mouth. Potential negative handling effects are inflammations, infections, tag expulsion, altered behavior, decreased swimming performance, reduced feeding, reduced growth and increased mortality. The catch, handling and tagging procedures should have minimal effects on the fish. If not, an anomalous behaviour caused by the tagging may be recorded instead of the natural behaviour, and the study is a failure from a scientific point of view. Furthermore, optimal anaesthetic and tagging methods are required to meet the ethical standards for use of experimental animals, and to ensure fish survival and welfare.

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Movements of Murray cod (Maccullochella peelii peelii) in a large Australian lowland river

Cited by 69 publications

References 49 publications

Comparative habitat use by large riverine fishes

Comparative habitat use by large riverine fishes

Identifying environmental correlates of intraspecific genetic variation

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