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Results 1 - 10 from 31 for spawning biomass in 0.609 sec.

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Atlantic - Stock Status Report B4-04 (2000)” On page 2, regarding the egg surveys: “Spawning biomass increased between 1983 and 1988 before shrinking and stabilizing between 1990 and 1994. Values ... with the peak spawning period.” Fair enough, so no good conclusions can be drawn from the 1996 data...which certainly CANNOT be interpreted to demonstrate a high level spawning biomass. In 1998, ...
fisherycrisis.com

Plaice
Since the mid 1980s, the spawning biomass stock has decreased to a very low level. The fishing method used to catch plaice ...
www.riverocean.org.uk

NCMC Conservation News - The Verdict on Striped Marlin: Overfished
Spawning biomass (the population of mature adults) has declined from around 40,000 metric tons in the early 1970s to about 5,000 tons in the early 2000s. Spawning biomass in 2003 ... decline since the 1970s. Recently it's been about half the long-term average. Both spawning biomass and landings will continue to decline if the current fishing mortality rate is maintained. A ...
savethefish.org

Ecology of Lakes and Ponds for Anglers
Therefore, the presence of these tributary streams (and how many good spawning beds they hold-i.e. gravel bars) will also determine fish ...
www.combat-fishing.com

Helcom : Fisheries
Baltic Sea since the mid 1980s (Figure 38). In 1992, the spawning stock biomass of cod in the Baltic reached a record low. Particularly in the eastern Baltic, cod stocks are seriously overexploited and their numbers are below safe biological limits. The spawning stock biomass ...
www.helcom.fi

EJF: Impacts of bycatch
NOAA High levels of bycatch can affect entire marine communities, reducing biomass and altering the ecological structure and diversity of the oceans. The impacts of bycatch on ... . Indeed, these brown shrimp fisheries have caused losses of 6-16% of the North Sea spawning stock of plaice. Because these non-target fish are discarded, potential landings lost are calculated ...
ejfoundation.org

EJF: Impacts of bycatch
NOAA High levels of bycatch can affect entire marine communities, reducing biomass and altering the ecological structure and diversity of the oceans. The impacts of bycatch on ... . Indeed, these brown shrimp fisheries have caused losses of 6-16% of the North Sea spawning stock of plaice. Because these non-target fish are discarded, potential landings lost are calculated ...
ejfoundation.org More from this site

Atlantic salmon by blocking its access to spawning grounds also blocked spawning runs of sea lampreys in some streams and prevented rapid increases to maximum ... Lake Ontario, fish production has already decreased as a result of a decline in phytoplankton biomass. The Ontario Ministry of Natural Resources (OMNR) attributes this decline to both water quality ...
environmentprobe.org

Exotics Guide
Phytoplankton blooms which had occurred annually in the northern bay ... Ecology Progress Series 66: 95-101. Nicolini, M.H. and D.L. Penry. 2000. Spawning, fertization, and larval development of Potamocorbula amurensis (Mollusca: Bivalvia) from San Francisco Bay, California. ...
exoticsguide.org

Geoff Regan meeting
In some places, where spawning herring appeared reliably for generations, they now seem to have vanished altogether. Also, small pelagic ... might need to direct DFO scientists to seek confirmation of the current small pelagic fish biomass on the offshore Eastern Scotian Shelf by conducting a systematic sonar survey (as was ...
fisherycrisis.com