395 research outputs found
Fishing at the edge of collapse: 27 Years of Common Fisheries Policy in Europe
Why were their considerable research efforts not dedicated to determining fishing regimes that maximize benefits for society while minimizing
negative impacts on the stocks and the marine
ecosystems
No relationship between fecundity and annual reproductive rate in bony fish
Background. There is still a widespread notion that bony fishes with high fecundities
are more productive and therefore more resistant to overexploitation. The purpose of
this study was to formally explore the relationship between fecundity and reproductive
success expressed as maximum annual reproductive rate, i.e. the number of new
spawners produced by existing spawners at low population densities.
Material and methods. We used maximum annual reproductive rate from a recent
study covering 49 species of bony fish; we used fecundity estimates from the published
literature.
Results. We found no significant relationship between fecundity (ranging from 368 to
10 million eggs) and maximum annual reproductive rate (ranging from 0.4 to 13.5
replacement spawners).
Conclusion. Fecundity in oviparous bony fish without parental care has no relation with
reproductive success. Apparently high fecundity in bony fish has evolved to counterbalance
pre-adult mortality, as indicated by the fact that variance in fecundity is 3 orders
of magnitude larger than variance in annual reproductive rate
Die Rückkehr der Scholle
Wissenschaftler: Zum Schutz der Plattfische nur große Exemplare verzehre
Fischerei in der Tiefsee: Das Ende der Oasen unter Wasser
"Die Tiefseefischerei sollte mit ganz wenigen Ausnahmen eingestellt werden", fasst der Fischereibiologe Rainer Froese vom Leibniz-Institut für Meereswissenschaften IFM-Geomar in Kiel eine Untersuchung zusammen...
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