Effects of the 1995 and 1998 mass mortality events on the spawning biomass of sardine, Sardinops sagax, in South Australian waters

@article{Ward2001EffectsOT,
  title={Effects of the 1995 and 1998 mass mortality events on the spawning biomass of sardine, Sardinops sagax, in South Australian waters},
  author={Tim M. Ward and Fe Hoedt and Lachlan McLeay and Wetjens F. Dimmlich and Matthew R. Kinloch and Gd Jackson and Richard McGarvey and Paul J. Rogers and Keith Jones},
  journal={Journal of Materials Science},
  year={2001},
  volume={58},
  pages={865-875}
}
This paper estimates and compares the effects of the mass mortalities of Sardinops sagax that occurred in South Australian waters in 1995 and 1998. After the 1995 event, the spawning biomass of S. sagax in South Australian waters fell by over 75% from approximately 165 000 tonnes to approximately 37 000 tonnes. No juvenile mortality was observed during 1995 and the population recovered quickly, with spawning biomass reaching 147 000 (70 000 to 234 000, 95%CI) tonnes in 1998. After the mass… 

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References

SHOWING 1-10 OF 32 REFERENCES
Use of the Daily Egg Production Method to Estimate the Stock Size of Western Australian Sardines (Sardinops sagax).
The daily egg production method was used to estimate the spawning biomass of the sardine Sardinops sagax in the Albany region of Western Australia. Plankton surveys covering 10000 - 14000 km² were
Impact of mortality, possibly due to herpesvirus, on pilchard Sardinops sagax stocks along the south coast of Western Australia in 1998-99
TLDR
Although the difference in total mortality between regions is probably related to differences in stock size, as determined by simulation models, the much lower estimate for Albany is probably an artefact of an over-estimated pilchard biomass and not due to large differences in actual mortality rates.
Have recent mass mortalities of the sardine Sardinops sagax facilitated an expansion in the distribution and abundance of the anchovy Engraulis australis in South Australia
TLDR
Results indicate that fluctuations in the relative abundance of S. sagax and Engraulis spp.
The 1995 mass mortality of pilchard: no role found for physical or biological oceanographic factors in Australia
TLDR
The hypothesis that environmental stress caused the mortalities of Sardinops sagax is quite confidently rejected, and the hypothesis that an introduced pathogen was responsible cannot be rejected.
Worldwide large-scale fluctuations of sardine and anchovy populations
TLDR
At high population levels, quality of sardine and their eggs decreased in Japan, leading to decreased production and survival of eggs, poor year-classes and stock collapse.
An egg production method for estimating spawning biomass of pelagic fish : application to the Northern Anchovy, Engraulis mordax
TLDR
An egg production method for anchovy biomass assessment and a major assumption used in the larval abundance census method is that there is constant proportionality between larval numbers and spawning biomass is proved to be erroneous.
Environmental and biological aspects of the mass mortality of pilchards (Autumn 1995) in Western Australia
The first pilchard deaths were reported in South Australia during March 1995 in the eastern region of the Great Australian Bight. Subsequently, dead pilchards were found both east and west of this
Trawl sampling of small pelagic fish off Angola: effects of avoidance, towing speed, tow duration, and time of day
TLDR
Pelagic fish distributed near the surface oV Angola were sampled with a medium-sized pelagic trawl having a vertical opening of about 20 m, and there were substantial day and night diVerences in the length distributions of sardinella, with small sardinalla being caught only at night.
SPAWNING INCIDENCE AND BATCH FECUNDITY IN NORTHERN ANCHOVY, ENGRAULIS MORDAX 1
TLDR
The high spawning frequency and the prolonged breeding season of the northern anchovy indicate that total fecundity may be limited by food availability and energy reserves.
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