Results 21 to 30 of about 869 (153)

A changing distribution of seabirds in South Africa – the possible impact of climate and its consequences

Frontiers in Ecology and Evolution, 2015
In the southern Benguela ecosystem off South Africa, there were recent shifts to the south and east in the distributions of three forage resources (anchovy, sardine, rock lobster), which probably were influenced by environmental change although fishing ...
Robert James Minchin Crawford, Robert James Minchin Crawford, Azwianewi B Makhado, Azwianewi B Makhado, Philip A Whittington, Philip A Whittington, Rod M Randall, W Herman Oosthuizen, Lauren J Waller   +8 more
doaj   +1 more source

Proposed equations for the model of the revised South African sardine stock structure hypothesis [PDF]

, 2023
This document proposes equations to model the revised South African sardine stock structure hypothesis. The model allows for either two components and two areas (with cold temperate sardine spawning off the west coast and warm temperate sardine spawning ...
Carryn de Moor (9998876)
core   +1 more source

Indicators of sustainable fishing for South African sardine Sardinops sagax and anchovy Engraulis encrasicolus [PDF]

, 2010
Six indicators were investigated for South African sardine Sardinops sagax and anchovy Engraulis encrasicolus: mean length of catch, length-at-50% maturity, total mortality, exploitation rate, ratio of bycatch, and centre of gravity of commercial catches.
Drapeau, L, Booth, Anthony J, Van der Lingen, C D, Van Der Westhuizen, J J, Fairweather, T P   +4 more
core   +2 more sources

Worldwide large-scale fluctuations of sardine and anchovy populations [PDF]

, 1999
Decade-scale regimes of sardine #Sardinops sagax$ and anchovy #Engraulis$ spp. have been observed in the productive coastal waters of the North-Western, North-Eastern and South-Eastern Pacific and the South-Eastern Atlantic. In each of these systems, the
Fletcher, W.J., Zazunga, J., Kawasaki, T, Lluch-Cota, S.E., J. Z. Zuzunaga, Nevarez Martínez, Manuel O, C. Roy, Nevárez-Martínez, M. O, Parrish, R.H., Roy, Claude, E. Hagen, R. H. Parrish, K. V. Shust, Roy, C., MacCall, A. D, Kawasaki, T., Ward, N.M., Lluch-Belda, D, Cloete, R, Matsuura, Yasunobu, Crawford, R. J. M, Bakun, A, Serra, Rodolfo, R. J. M. Crawford, Shust, K. V, Green-Ruiz, Y, R. Serra, Alheit, J., Lluch-Belda, D., Schwartzlose, R. A, Matsuura, Y, Hagen, E., J. Alheit, Crawford, R.J.M., Lluch Belda, Daniel, Green Ruiz, Y., Cloete, R., A. Bakun, S. E. Lluch-Cota, Hagen, E, Bakun, Andrew, Roy, C, D. Lluch-Belda, Baumgartner, T. R, Zuzunaga, J. Z, Nevarez-Martinez, M.O., T. R. Baumgartner, Schwartzlose, R.A., Matsuura, Y., Zuzunaga, J.Z., Parrish, R. H, Serra, R, M. O. Nevárez-Martínez, Ward, M. N, Y. Green-Ruiz, Baumgartner, T.R., W. J. Fletcher, M. N. Ward, Ward, M.N., Shust, K.V., R. A. Schwartzlose, T. Kawasaki, Green-Ruiz, Y., Lluch Cota, Salvador E., R. Cloete, A. D. MacCall, Lluch-Cota, S. E, Y. Matsuura, Bakun, A., Fletcher, W. J, MacCall, A.D., Alheit, J, Serra, R.   +72 more
core   +1 more source

“Third for the Birds” for South African Sardine and Anchovy?

, 2022
The suitability of performance statistics relating future projected levels of sardine and anchovy biomass to one third of the historical maximum survey estimate of abundance was discussed during the May 2015 SWG-PEL meeting. This document provides some further information to assist discussions.
openaire   +1 more source

Alternative hypotheses of west to south movement considered for South African sardine

, 2022
A key consideration in the simulation projection framework to be used to test Candidate Management Procedures for OMP 17 are alternative hypotheses of the proportion of 1-year-old sardine that move from the west coast to the south coast each year. (The proportion of older sardine that move is linked to the proportion of 1-year-olds which move.) This ...
de Moor, Carryn, Butterworth, Doug, Coetzee, Janet   +2 more
openaire   +2 more sources

Initial results from the revised population dynamics model of the South African sardine resource modelling two components in two areas [PDF]

, 2023
This document provides initial results from fitting the model of South African sardine proposed by de Moor (2023) to available data disaggregated by two areas, west and east of Cape Agulhas. These results correspond to the two component option, with cold
Carryn de Moor (9998876)
core   +1 more source

A summary of the South African sardine (and anchovy) fishery

, 2018
The sardine fishery is an important component of the South African purse-seine fishery, the largest commercial fishery in South Africa (by landed mass). This fishery, initially established on the West Coast, but with some subsequent infrastructure development on the South Coast, is currently under pressure because of recent low biomass levels, reduced ...
Coetzee, Janet, de Moor, Carryn, Butterworth, Doug   +2 more
openaire   +3 more sources

Has the fishery contributed to a major shift in the distribution of South African sardine? [PDF]

ICES Journal of Marine Science, 2008
Abstract Coetzee, J. C., van der Lingen, C. D., Hutchings, L., and Fairweather, T. P. 2008. Has the fishery contributed to a major shift in the distribution of South African sardine? – ICES Journal of Marine Science, 65: 1676–1688. A major shift in the distribution of South African sardine (Sardinops sagax) has resulted in a significant ...
Janet C. Coetzee, Carl D. van der Lingen, Laurence Hutchings, Tracey P. Fairweather   +3 more
openaire   +1 more source

Some initial results using the revised two mixing-stock hypothesis for South African sardine [PDF]

, 2022
The operating model of the South African sardine resource is being updated from the last assessment (de Moor and Butterworth 2015a) to take account of data collected between 2012 and 2014.
Carryn de Moor (9998876), Doug Butterworth (10005953)   +1 more
core   +1 more source