The take of fish species by seabirds and marine mammals in the Australian Fisheries Zone around Heard Island: the potential for competition with a commercial fishery

Polar Biology ◽  
1998 ◽  
Vol 20 (4) ◽  
pp. 273-280 ◽  
Author(s):  
K. Green ◽  
D. J. Slip ◽  
G. J. Moore
Keyword(s):  
Fish Species ◽  
Marine Mammals ◽  
Commercial Fishery ◽  
Heard Island

Length‐weight relationships for 15 fish species in the East China Sea mainly captured by the commercial fishery and subelemented by survey samples

2020 ◽  
Vol 36 (4) ◽  
pp. 536-538
Author(s):  
Feng Chen ◽  
Hongliang Zhang ◽  
Zhou Fang ◽  
Ai Guo ◽  
Rijin Jiang ◽  
...  
Keyword(s):  
East China Sea ◽  
Fish Species ◽  
East China ◽  
Commercial Fishery ◽  
The East China Sea ◽  
China Sea

Relative abundance and behavior of marine mammals exposed to transmissions from the Heard Island Feasibility Test

1994 ◽  
Vol 96 (4) ◽  
pp. 2469-2484 ◽  
Author(s):  
Ann E. Bowles ◽  
Mari Smultea ◽  
Bernd Würsig ◽  
Douglas P. DeMaster ◽  
Debra Palka
Keyword(s):  
Relative Abundance ◽  
Marine Mammals ◽  
Heard Island ◽  
Feasibility Test ◽  
And Behavior

scholarly journals Long-term dynamics of biomass and dominant species of the bottom fish complex in Peter the Great Bay

2021 ◽  
Vol 201 (1) ◽  
pp. 44-61
Author(s):  
P. V. Kalchugin
Keyword(s):  
Fish Species ◽  
Marine Mammals ◽  
Peter The Great Bay ◽  
Japan Sea ◽  
Demersal Fish ◽  
Ecosystem Approach ◽  
Total Biomass ◽  
Peter The Great ◽  
Great Bay ◽  
Bottom Fish

Dynamics of demersal fish biomass is considered on results of trawl surveys conducted in Peter the Great Bay (Japan Sea) in 1977-2015. Fishery did not have a significant impact on this complex of fish species, including both fluctuating species (walleye pollock, arabesque greenling, pacific herring) and species with stable stock, because of low intensity. Annual landings in the bay were much lower than recommended volumes (TAC). However, a tendency to the total biomass decreasing was observed, accompanied with growth of the sculpins (Cottidae) portion in the ratio of species biomass. The sculpins prey on juveniles of many other species, so maybe their higher abundance was one of reasons for general depletion of the benthic fish community. Other predators, as marine mammals, were not abundant in Peter the Great Bay. For rational resource management, the fishery impact should be distributed proportionally between populations, taking into account their state, so both traditional commercial objects and predators with growing abundance should be landed. This ecosystem approach requires permanent monitoring to all groups of fish species.

scholarly journals Impact of deep-sea fishery for Greenland halibut (Reinhardtius hippoglossoides) on non-commercial fish species off West Greenland

2014 ◽  
Vol 71 (4) ◽  
pp. 845-852 ◽  
Author(s):  
Ole A. Jørgensen ◽  
François Bastardie ◽  
Ole R. Eigaard
Keyword(s):  
Fish Species ◽  
Deep Sea ◽  
Fishing Effort ◽  
Scientific Data ◽  
Commercial Fishery ◽  
Greenland Halibut ◽  
Commercial Fish ◽  
West Greenland ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Reinhardtius Hippoglossoides

Abstract Since the late 1980s, a deep-sea fishery for Greenland halibut (Reinhardtius hippoglossoides) has been developing gradually in West Greenland. Deep-sea fish species are generally long-lived and characterized by late age of maturity, low fecundity, and slow growth, features that probably cause low resilience following overexploitation. In order to evaluate whether populations of nine potential bycatch species are negatively affected by the commercial fishery for Greenland halibut, scientific data from bottom-trawl surveys conducted in the same area and period as the commercial fishery were analysed. During the period 1988–2011, population abundance and size composition changed as catch and effort in the Greenland halibut fishery increased. Two species showed a significant decrease in abundance, and four populations showed a significant reduction in mean weight of individuals (p < 0.05). Correlation analyses show that most of the observed trends in abundance are probably not related to increasing fishing effort for Greenland halibut. The analysis did, however, show that most of the observed decreases in mean weight were significantly correlated with fishing effort during the 24-year period.

INFLUENCE OF INVADER CTENOPHORAN MNEMIOPSIS LEIDYI (A. AGASSIS, 1865) ON THE GENERAL PARTS OF THE CASPIAN SEA ECCOSYSTEM

2018 ◽  
pp. 35-48
Author(s):  
Andrey Mikhailovich Kamakin ◽  
Yuriy Aleksandrovich Paritskiy ◽  
Raisa Pavlovna Khodorevskaya
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
Marine Mammals ◽  
Nutrient Budget ◽  
Mnemiopsis Leidyi ◽  
Ecological Problem ◽  
Annual Data ◽  
The Caspian Sea ◽  
Commercial Fish ◽  
Strategy Of Development

The article presents annual data (1999-2016) of ecological surveillance on the influence of newish for the Caspian Sea invader Mnemiopsis leidyi (A. Agassis, 1865) on marine and anadromous fish species. There has been given the analysis of unfavourable effect of invader Mnemiopsis leidyi (A. Agassis, 1865) on the abundance of marine, anadromous, semi-anadromous fishes and Caspian seal. There have been considered mechanisms, sequence and degree of impact of ctenophoran on ichthyophauna and marine mammals via a nutritive base. It has been stated that mnemiopsis distribution corresponds to seasonal distribution of zooplankton and meroplankton, whereas ctenoforan being an organism with aggressive "r-strategy" of development influences ichthyophauna both directly (eating pelagic roe and larvae of sea fish) and indirectly (via nutritive base). Drastic reduction of catches of the Caspian sprat, in particular anchovy sprat and big-eyed sprat, is stipulated by nutritional competence between these fish species and ctenoforan Mnemiopsis leidyi. In turn, decrease in number of the Caspian sprat resulted in change of the nutrient budget of the sturgeon (Russian sturgeon, stellate sturgeon, beluga) and in decrease of their number and commercial stocks. There have been offered the solutions to the ecological problem and measures to restore sturgeon stocks. Results of the research can be used in forecasting commercial fish species stocks in the Caspian Sea and in determining the damage from annual invasions of Mnemiopsis ( Memiopsis leidyi (A. Agassis, 1865)) in the northern part of the Caspian Sea.

Observations on the abundance and behavior of marine mammals exposed to the Heard Island source transmissions.

1991 ◽  
Vol 90 (4) ◽  
pp. 2329-2330
Author(s):  
Ann E. Bowles ◽  
Mari Smultea ◽  
Bernd Würsig ◽  
Douglas P. DeMaster ◽  
Debra Palka
Keyword(s):  
Marine Mammals ◽  
Heard Island ◽  
And Behavior

Zooplankton and Micronekton products from the CMEMS Catalogue for better monitoring of Marine Resources and Protected Species

2020 ◽  
Author(s):  
Patrick Lehodey ◽  
Olivier Titaud ◽  
Anna Conchon ◽  
inna Senina ◽  
Jacques Stum
Keyword(s):  
Fish Species ◽  
Marine Mammals ◽  
Fish Larvae ◽  
Horizontal Resolution ◽  
Trophic Levels ◽  
Global Ocean ◽  
Protected Species ◽  
Explanatory Variables ◽  
Model Based ◽  
In Situ Data

&lt;p&gt;Since 2019, the Copernicus Marine portfolio is providing a new model-based product on Zooplankton and Micronekton, representing the low and mid-trophic levels (LMTL) of the ocean food chain (Global Ocean low and mid trophic levels biomass multi year product: ). Zooplankton are organisms in the size range of less than 1 to a few millimeters (e.g., copepods) constituting prey of all fish larvae and small pelagic fish species (e.g herring, sardines and anchovies). Micronekton are also relatively small but actively swimming organisms such as crustaceans, fish, and cephalopods that are typically about 1 to 10 centimeters in size. Micronekton are prey of large fish and other oceanic predators. They are also predators of fish larvae. Therefore, zooplankton and micronekton distributions are key explanatory variables to understand fish recruitment mechanisms, individual behaviour of satellite tracked individuals of protected species (e.g., marine turtles, seabirds, sharks and marine mammals), and dynamics of large populations of fish species either targeted by fisheries (mackerel, tuna, swordfish, etc.) or strictly controlled in by-catch (e.g., bluefin tuna or sharks). The product includes 2-dimensional (latitude-longitude) maps of biomass for zooplankton and groups of micronekton on a weekly basis from 1998 to 2018 at a 25 km horizontal resolution. It is a model-based estimation of micronekton biomass, relying on the most possible realistic forcings (temperature, currents and primary production) assimilating satellite and in situ data. Continuous progress in the development and validation of these new models and products will help to reduce our knowledge gaps and will also support the Science &amp; Climate sector as zooplankton and micronekton are key to better quantifying the carbon uptake and storage in the ocean, known as the &amp;#8220;biological carbon pump&amp;#8221;.&lt;/p&gt;

Ecological hypotheses for a historical reconstruction of upper trophic level biomass in the Baltic Sea and Skagerrak

2002 ◽  
Vol 59 (1) ◽  
pp. 173-190 ◽  
Author(s):  
Brian R MacKenzie ◽  
Jürgen Alheit ◽  
Daniel J Conley ◽  
Poul Holm ◽  
Carl Christian Kinze
Keyword(s):  
Baltic Sea ◽  
Fish Species ◽  
Marine Mammal ◽  
Marine Mammals ◽  
Environmental Variability ◽  
Saline Water ◽  
Clupea Harengus ◽  
The Baltic Sea ◽  
The Baltic

Fish and marine mammal populations in the Baltic Sea and Skagerrak have undergone major fluctuations over the past five centuries. We summarize how these fluctuations may have depended on various forms of predation (e.g., cannibalism, fishing, hunting) and environmental processes. The best-documented long-term fisheries in this region are the herring (Clupea harengus) fisheries near Bohuslän, western Sweden, and in the Øresund. These fisheries have been important since at least the 1200s and appear to be partly climatically driven. However, in the rest of the Baltic, information about fisheries for herring and other fish species is rare until after 1900. During the 20th century, while the Baltic underwent eutrophication, the biomass and landings of three fish species (cod (Gadus morhua), herring, and sprat (Sprattus sprattus)) all increased, whereas the biomass of marine mammals (grey seals (Halichoerus grypus), ringed seals (Phoca hispida), harbour porpoises (Phocoena phocoena)) decreased. The relative roles of exploitation, marine mammal predation, and environmental variability (e.g., eutrophication, major inflows of saline water, climate change) on the long-term dynamics of key fish species is not clear and requires increased collaboration among historians, fisheries and marine mammal ecologists, oceanographers, and climatologists.

The diet of Antarctic fur seals during the late autumn and early winter around Heard Island

1991 ◽  
Vol 3 (4) ◽  
pp. 359-361 ◽  
Author(s):  
K. Green ◽  
R. Williams ◽  
H.R. Burton
Keyword(s):  
Fish Species ◽  
Pelagic Fish ◽  
Early Winter ◽  
Late Autumn ◽  
Fur Seals ◽  
Heard Island ◽  
Significant Difference ◽  
Antarctic Fur Seals

The diet of Antarctic fur seals around Heard Island was investigated in May and June 1990. Fish predominated in samples, occurring in an average of 93.4% of droppings. Otoliths from pelagic fish (mainly myctophids) constituted over 96% of all otoliths. There was an increase in the occurrence of squid from 3.4% in summer 1987/88 to 49.3% in the present study. For the fish species Gymnoscopelus nicholsi (Gilbert), 10.3% of otoliths recovered from scats were considered suitable for measurement compared with 30.5% from scats at Heard Island in 1987/88; this greater level of erosion provides further evidence that the seals were foraging further afield. The study demonstrates a significant difference between summer 1987/88 and winter 1990.

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