title: Restoring giant kokopu (Galaxias argenteus) populations in Hamilton's urban streams

authors: Aldridge, Brenda Michelle Te Aroha

subjects: Giant kokopu

abstract: 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.

text: Restoring giant kokopu (Galaxias argenteus) populations in Hamilton's urban streams 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.

year: 2008

title: Youth and sporting (im)mobilities in disrupted and conflicted spaces

authors: Thorpe, Holly Aysha

abstract: War, conflict and natural disasters disrupt millions of lives around the world each year. With fighting and wars raging across the Middle East, Eastern Europe, Africa and Asia, death tolls are "on the rise" (Storm, 2015), and the United Nations recently estimated the cost of natural disasters at $300 billion per year (UN Global Assessment, 2015). Scholars working in the social sciences and humanities have long been looking beyond the casualties and economic impacts of such events, to examine the social and psychological consequences of such events on individuals, families and communities.

text: Youth and sporting (im)mobilities in disrupted and conflicted spaces War, conflict and natural disasters disrupt millions of lives around the world each year. With fighting and wars raging across the Middle East, Eastern Europe, Africa and Asia, death tolls are "on the rise" (Storm, 2015), and the United Nations recently estimated the cost of natural disasters at $300 billion per year (UN Global Assessment, 2015). Scholars working in the social sciences and humanities have long been looking beyond the casualties and economic impacts of such events, to examine the social and psychological consequences of such events on individuals, families and communities.

year: 2015

title: Ideology is theft: Thoughts on the legitimacy of a Maori psychology

authors: Tamatea, Armon J.

subjects: Maori

abstract: ‘War, in fact, can be seen as a process of achieving equilibrium among unequal technologies’ (McLuhan, 1964) 
We are at war. As Western science and its accompanying technology expands the frontiers of knowledge at an ever-increasing rate, ‘indigenous’ perspectives of knowledge are exiled into the borderlands of special interest groups and localized research programmes. Mainstream scientific thought lays claim to objective interpretations of experience at the expense of alternative realities offered by emerging theories of knowledge. Furthermore, as localized worldviews (i.e., those derived from ancestral knowledge bases and pre-industrial or non-scientific premises) challenge existing paradigms, the inevitable interactions threaten to undermine the fidelity of this knowledge. One such arena where this ideological conflict is apparent is the growing field of Maori psychology.

text: Ideology is theft: Thoughts on the legitimacy of a Maori psychology ‘War, in fact, can be seen as a process of achieving equilibrium among unequal technologies’ (McLuhan, 1964) 
We are at war. As Western science and its accompanying technology expands the frontiers of knowledge at an ever-increasing rate, ‘indigenous’ perspectives of knowledge are exiled into the borderlands of special interest groups and localized research programmes. Mainstream scientific thought lays claim to objective interpretations of experience at the expense of alternative realities offered by emerging theories of knowledge. Furthermore, as localized worldviews (i.e., those derived from ancestral knowledge bases and pre-industrial or non-scientific premises) challenge existing paradigms, the inevitable interactions threaten to undermine the fidelity of this knowledge. One such arena where this ideological conflict is apparent is the growing field of Maori psychology.

year: 2008