New Zealand Ecotoxicity Data for Freshwater Fish

Species	Toxicant Test concs (m g)	Test Duration & End point	NOEC m g L^-1	LOEC d m g L^-1	Toxicity Value (LC₅₀ or EC₅₀) f	Total Hardness mg L^-1
Bully G. cotidianus	Cu(II) {180, 320, 560, 1000, 1800}^a	96h survival	180	320	520(600-436)	36.5
Bully G. cotidianus	Cu(II) {5.6, 10, 18, 32, 56, 100}^a	18d survival	10	18	23.7(40.5-13.8)	36.5
Inanga G. maculatus	Cu(II) {10, 18, 32, 56, 100}^a	96h survival	56.0	100	85(100-75)	39.2
Inanga G. maculatus	Cu(II) {5.6, 10, 18, 56}^a	21d survival	18.0	56.0	31.5(32.4-31.7)	39.2

^{a Nominal concentrations.
^{d NOEC and LOEC were calculated
using one-way analysis of variance (ANOVA), and appropriate USEPA
approved hypothesis testing at a significance level of p < 0.05.
^{f LC₅₀ and EC₅₀
values were derived from either Probit analysis, trimmed Spearman-Karber
or Linear Interpolation. 95% confidence intervals are given in
parentheses.

Chromium VI

Species

Toxicant

Test Duration & End point

NOEC^b

m g L^-1

LOEC^b

m g L^-1

Toxicity Value^c

(LC₅₀ or EC₅₀)

Bully

G. cotidianus

Cr(VI)

{18000 – 100000}^a

96h survival

56000

100000

>100000

Cr(VI)

18d survival

8000^d

15000^d

9000^d

Inanga

G. maculatus

Cr(VI)

{10000 – 100000}^a

96h survival

18000

32000

37900(42500-33800)

Cr(VI)

{5600 – 56000}^a

21d survival

<5600

5600

3400(4600-3000)

^{a Nominal concentrations.
^{b NOEC and LOEC were calculated using one-way analysis of
variance (ANOVA), and appropriate USEPA approved hypothesis testing at a
significance level of p < 0.05.
^{c LC₅₀ and EC₅₀ values were derived from
either Probit analysis, trimmed Spearman-Karber or Linear Interpolation.
95% confidence intervals are given in parentheses.
^{d Chronic values estimated from acute
data using acute/chronic ratios calculated from inanga data.

Arsenic V

Species

Toxicant
Test concs
(m g L^-1)

Test Duration & End point

NOEC d
m g L^-1

LOEC d
m g L^-1

Toxicity Value f
(LC₅₀ or EC₅₀)

Bully

G. cotidianus

As(V)

{32000 –320000}^a

96h survival

56000

100000

133300(154000-115500)

As(V)

{5600 – 100000}^a

18d survival

32000

56000

66900**

Inanga

G. maculatus

As(V)

{40000 – 250000}^a

96h survival

40000

63000

56800(64500-48900)

As(V)

{5600 – 32000}^a

21d survival

18000

32000

28900(33400-23500

a
Nominal concentrations.
^{d NOEC and LOEC were calculated
using one-way analysis of variance (ANOVA), and appropriate USEPA
approved hypothesis testing at a significance level of p < 0.05.
^{f LC₅₀ and EC₅₀
values were derived from either Probit analysis, trimmed Spearman-Karber
or Linear Interpolation. 95% confidence intervals are given in
parentheses.
** EC₅₀ toxicity curve was incomplete, no confidence
intervals were able to be calculated.
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Page last updated: 01 May 2007