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Novel fisheries investigations by Harald Dannevig: some parallels with Johan Hjort on the other side of the world

Published on Jan 25, 2020in Ices Journal of Marine Science3.367
· DOI :10.1093/ICESJMS/FSAA001
Iain M. Suthers36
Estimated H-index: 36
(UNSW: University of New South Wales),
Dennis D Reid (Australian Museum)+ 1 AuthorsHayden T. Schilling2
Estimated H-index: 2
(UNSW: University of New South Wales)
Abstract
  • References (17)
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References17
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By leading the Canadian Fisheries Expedition of 1914–1915 Johan Hjort took the opportunity to do far more than just survey herring, other fish stocks, and thehydrographyofCanadianAtlanticwaters. He also attempted to improve thebackwardfish-processing technologies used in the local fisheries, an agenda blocked by the Canadian government. Hjort did succeed markedly, however, in introducing Canadian scientists to the International Council for the Exploration of the Sea’s new scientific methods for ...
6 CitationsSource
That recruitment of juveniles to the stocks of fish is subject to natural variations is considered a scientific truth, if not a truism, in marine science. However, in 1914,when the zoologist JohanHjort (1869–1948) published thenotion, itmeant a basic change in theunderstanding of the biologyof the sea fish. A century later, his insight is a topic still at the centre of interest in fish biology. Hjort based his concept largely on investigations of herring (Clupea harengus) and cod (Gadus morhua) ...
11 CitationsSource
#1Jason D. Everett (UNSW: University of New South Wales)H-Index: 15
#2Mark E. Baird (UTS: University of Technology, Sydney)H-Index: 21
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 4 authors...
[1] The Tasman Sea is unique - characterised by a strong seasonal western boundary current that breaks down into a complicated field of mesoscale eddies almost immediately after separating from the coast. Through a 16-year analysis of Tasman Sea eddies, we identify a region along the southeast Australian coast which we name ‘Eddy Avenue’ where eddies have higher sea level anomalies, faster rotation and greater sea surface temperature and chlorophyll a anomalies. The density of cyclonic and antic...
89 CitationsSource
#1Anna Lucas (UTAS: University of Tasmania)H-Index: 2
#2Lorne K. Kriwoken (UTAS: University of Tasmania)H-Index: 17
Last. Elizabeth Leane (UTAS: University of Tasmania)H-Index: 5
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John King Davis captained S.Y. Aurora on three voyages to Antarctica and on other sub-Antarctic cruises for Douglas Mawson’s Australasian Antarctic Expedition (AAE) 1911–1914. Between the first and second Antarctic trips, he made a short return cruise in 1912 from Melbourne to Eden in southeastern Australia with the Director of Commonwealth Fisheries, on the fisheries investigation steamship, F.I.S. Endeavour . This cruise was a milestone in his continuing training for the AAE’s oceanographic wo...
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Abstract Norwegian coastal cod form a stationary population of Atlantic cod Gadus morhua consisting of several genetically separated subpopulations. A small-scale differentiation in marine populations with pelagic eggs and larvae is made possible by local retention of early life stages in coastal environments. A numerical model was used to simulate the circulation in a fjord system in northern Norway over 2 years with different river runoff patterns. The dispersal of cod eggs was calculated with...
38 CitationsSource
#1Jonathan Gillson (UNSW: University of New South Wales)H-Index: 4
#2James Scandol (New South Wales Department of Primary Industries)H-Index: 1
Last. Iain M. Suthers (UNSW: University of New South Wales)H-Index: 36
view all 3 authors...
Commercial catch-per-unit-effort (CPUE) data from nine estuaries were related to hydrological variation in eastern Australia. Relationships between drought declaration, rainfall, freshwater flow and fisheries catch rates were assessed from 1997 to 2007. Estuaries varied from 0.5 to 2.0 × 106 ML of mean freshwater inflow per annum. Monthly CPUE data from gillnetting were used to infer the abundance of yellowfin bream (Acanthropagrus australis), dusky flathead (Platycephalus fuscus), luderick (Gir...
49 CitationsSource
The South East Fishery is one of Australia’s oldest fisheries. Early research on this trawl fishery centred on tiger flathead, the major target species. In the 1970s, the Federal Government actively encouraged fishery development and funded several trawl surveys. Profitable catch rates and optimistic assessments of resource size caused a rapid expansion of the trawl fleet. Separate jurisdictions hampered strategic approaches to SEF-wide research until 1978. Most SEF research in the mid 1960s to ...
31 CitationsSource
Haul-by-haul steam trawler catch and effort data for 1918–23, 1937–43 and 1952–57, which cover a large portion of the history of steam trawling in the Australian South East Fishery, were examined in detail for the first time. There were 64371 haul records in total. The catch-rate for all retained catch combined shows a strong decline overall, with a brief recovery during World War II, probably due to increased retention of previously discarded species. The fishing fleet moved to more distant fis...
26 CitationsSource
#1Terje SvåsandH-Index: 19
#2Tore S. KristiansenH-Index: 23
Last. M. NødtvedtH-Index: 1
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Atlantic cod have been a primary target for marine stock enhancement since the 1880s. In the early part of this period, hatched larvae were released in Norway, the USA and Canada. The last larval releases were conducted in Norway in 1971, and a century of cod larvae releases were halted without any clear evidence of benefit. Since the early 1980s, the focus has been on production of larger, more viable juvenile cod. Emphasis has been given to the design of tag–release programmes involving large-...
110 CitationsSource
#1Per SolemdalH-Index: 1
Modern Norwegian fisheries research originated in Bergen in 1900. Johan Hjort was the leader of both the scientific investigations and the fisheries administration and management (Fig. 20.1). He came from an old civil service family and was an active, liberal politician. This pioneer period of Norwegian marine research was interrupted by the outbreak of the First World War.
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