Size at Maturity and Patterns of Growth and Reproduction in an Insect with Indeterminate Growth

Oikos ◽  
1993 ◽  
Vol 66 (1) ◽  
pp. 17 ◽  
Author(s):  
G. Ernsting ◽  
C. Zonneveld ◽  
J. A. Isaaks ◽  
A. Kroon
Keyword(s):  
Size At Maturity ◽  
Indeterminate Growth ◽  
Growth And Reproduction

scholarly journals Improved estimates of age, growth and reproduction for the regionally endemic Galapagos sailfin grouperMycteroperca olfax(Jenyns, 1840)

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1270 ◽  
Author(s):  
Paolo Usseglio ◽  
Alan M. Friedlander ◽  
Edward E. DeMartini ◽  
Anna Schuhbauer ◽  
Eva Schemmel ◽  
...  
Keyword(s):  
Growth Function ◽  
Management Plan ◽  
Parameter Estimates ◽  
Size At Maturity ◽  
Fishery Resource ◽  
Galapagos Archipelago ◽  
Von Bertalanffy Growth Function ◽  
Mean Size ◽  
Growth And Reproduction

The Galapagos Sailfin grouper,Mycteroperca olfax, locally known as bacalao and listed as vulnerable by the IUCN, is culturally, economically, and ecologically important to the Galapagos archipelago and its people. It is regionally endemic to the Eastern Tropical Pacific, and, while an important fishery resource that has shown substantial declines in recent years, to date no effective management regulations are in place to ensure the sustainability of the Galapagos fishery for this species. Previous estimates of longevity and size at maturity for bacalao are inconsistent with estimates for congeners, which brings into question the accuracy of prior estimates. We set out to assess the age, growth, and reproductive biology of bacalao in order to provide more accurate life history information to inform more effective fisheries management for this species. The oldest fish in our sample was 21 years old, which is 2–3 times greater than previously reported estimates of longevity. Parameter estimates for the von Bertalanffy growth function (k= 0.11,L∞= 110 cm TL, andto= − 1.7 years) show bacalao to grow much slower and attain substantially larger asymptotic maximum length than previous studies. Mean size at maturity (as female) was estimated at 65.3 cm TL, corresponding to a mean age of 6.5 years. We found that sex ratios were extremely female biased (0.009 M:1F), with a large majority of the individuals in our experimental catch being immature (79%). Our results show that bacalao grow slower, live longer, and mature at a much larger size and greater age than previously thought, with very few mature males in the population. These findings have important implications for the fishery of this valuable species and provide the impetus for a long-overdue species management plan to ensure its long-term sustainability.

The influences of density on growth and reproduction in moose Alces alces

2000 ◽  
Vol 6 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Steven H. Ferguson ◽  
Alan R. Bisset ◽  
François Messier
Keyword(s):  
Alces Alces ◽  
Growth And Reproduction
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