Impoundment and introductions: Their impacts on native fish of the upper Waipori River, New Zealand

1999 ◽  
Vol 29 (4) ◽  
pp. 291-299 ◽  
Author(s):  
Richard M. Allibone
Keyword(s):  
New Zealand ◽  
Native Fish

scholarly journals Predicting New Zealand riverine fish reference assemblages

2018 ◽  
Author(s):  
Adam D Canning
Keyword(s):  
New Zealand ◽  
Freshwater Fish ◽  
Riparian Vegetation ◽  
Fish Assemblages ◽  
Reference Conditions ◽  
Native Fish ◽  
River Reach ◽  
Riverine Fish ◽  
Insight Into

Biomonitoring is a common method to monitor environmental change in river ecosystems, a key advantage of biomonitoring over snap-shot physicochemical monitoring is that it provides a more stable, long-term. insight into change that is also effects-based. In New Zealand, the main biomonitoring method is a macroinvertebrate sensitivity scoring index, with little established methods available for biomonitoring of fish. This study models the contemporary distribution of common freshwater fish and then uses those models to predict freshwater fish assemblages for each river reach under reference conditions. Comparison of current fish assemblages with those predicted in reference conditions (as observed/expected ratios) may provide a suitable option for freshwater fish biomonitoring. Most of the fish communities throughout the central North Island and lower reaches show substantial deviation from the modelled reference community. Most of this deviation is explained by nutrient enrichment, followed by downstream barriers (i.e., dams) and loss of riparian vegetation. The presence of modelled introduced species had relatively little on the presence of the modelled native fish. The maps of observed/expected fish assemblage may provide a rapid way to identify potential restoration sites.

Feeding in a Nocturnally active fish, Galaxias brevipinnis, in a New Zealand stream

1989 ◽  
Vol 40 (3) ◽  
pp. 231 ◽  
Author(s):  
GJ Glova ◽  
PM Sagar
Keyword(s):  
New Zealand ◽  
Benthic Invertebrates ◽  
Stomach Contents ◽  
Feeding Habit ◽  
Native Fish ◽  
Selective Feeding ◽  
Chironomid Larvae ◽  
Feeding Periodicity ◽  
Active Fish ◽  
Fish Stomach

To determine the diel feeding periodicity and diet of a lake-inlet population of Galaxias brevipinnis in New Zealand, samples of benthos, drift and fish were collected over a 24-h period in summer. Both numerically and gravimetrically, fish stomach contents revealed that feeding started some time after sunset, peaked towards midnight, and virtually ceased after sunrise. Benthic invertebrates were consumed almost exclusively, with ephemeropterans, trichopterans, and dipterans constituting 95% of the total foods eaten, a major proportion being chironomid larvae. Size of prey eaten compared with size of invertebrates in the benthos differed significantly during the night; this indicated that some size-selective feeding occurred. The benthic feeding habit of Galaxias brevipinnis appears to allow it to forage on relatively small prey during the night, a phenomenon that has been reported for other bottom-dwelling native fish species in New Zealand.

Dietary and spatial overlap between stream populations of a native and two introduced fish species in New Zealand

1991 ◽  
Vol 42 (4) ◽  
pp. 423 ◽  
Author(s):  
GJ Glova ◽  
PM Sagar
Keyword(s):  
New Zealand ◽  
Fish Species ◽  
Salmo Trutta ◽  
Water Velocity ◽  
Native Fish ◽  
Introduced Fish ◽  
Exotic Fish ◽  
Inlet Stream ◽  
Water Depths ◽  
Benthic Prey

Benthic and drifting invertebrates as well as fish were sampled in a lake-inlet stream over a 24-h period in summer in order to investigate interactions for food and space between a native fish species (Galaxias brevipinnis, Galaxiidae) and juveniles of two exotic fish species (Salmo trutta and Oncorhynchus mykiss, Salmonidae) in New Zealand. Galaxias brevipinnis fed almost exclusively at night on the benthos, whereas both trout species fed mostly during the day on drifting and benthic prey. Larvae of Deleatidium (Ephemeroptera), Hydrobiosis and Oxyethira (Trichoptera), and Austro-simulium and Chironomidae (Diptera) were the major prey in the diets of all three fish species. Small prey made up a greater proportion of the diet of G. brevipinnis than for either trout species. All three species of fish were found primarily in riffles and runs in water depths of 0.1-0.3 rn, with G. brevipinnis frequently being in faster-flowing areas (water velocity 0.8-1.1 m s-1) than was either trout species (water velocity 0.4-0.7 rn s-1). These differences in pattern of die1 feeding and micro- habitat use no doubt lessen the interaction between the galaxiid and salrnonid fish species.

Avoidance of suspended sediment by the juvenile migratory stage of six New Zealand native fish species

1997 ◽  
Vol 31 (1) ◽  
pp. 61-69 ◽  
Author(s):  
Jacques A. T. Boubée ◽  
Tracie L. Dean ◽  
David W. West ◽  
Rhys F. G. Barrier
Keyword(s):  
New Zealand ◽  
Suspended Sediment ◽  
Fish Species ◽  
Native Fish
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