262 



Fishery Bulletin 98(2) 



fishermen and wildlife wardens for their help aboard 

 ship and in the field. Three anonymous reviewers 

 (especially no. 817) and Sarah Shoffler made impor- 

 tant and useful comments that enhanced the anal- 

 ysis of results and the expression of the ideas. As 

 always, Sharyn Matriotti gave us important help 

 with this article. Institutional support was provided 

 by Centro Nacional Patagonico (CONICET), Univer- 

 sidad Nacional de la Patagonia, Fundacion Patago- 

 nia Natural, Prefectura Naval Argentina, and the 

 government of Chubut Province. The fishing compa- 

 nies Harengus S.A. and Alpesca S.A. collaborated 

 with the authors in the retrieval of entangled sea 

 lions and gave their permission for work onboard 

 their fishing vessels. This work was carried out with 

 the financial support of the National Geographic Soci- 

 ety (Grant 5548/95 to E.A. Crespo and A.C.M. Schia- 

 vini), the Whale and Dolphin Conservation Society, 

 the Patagonian Coastal Zone Management Plan 

 (GEF/UNEP FPNAVCS) and the Programa de Coo- 

 peracion Cientifica con Iberoamerica (1996-1998). 



Literature cited 



Angelescu, V. 



1982. Ecologia trofica de la anchoita del Mar Argentino 

 (Engraulidae, Engraulis anchoita). Parte II. AJimentacion, 

 comportamiento y relaciones troficas en el ecosistema. 

 INIDEP ( Institute Nacional de Investigacion y Desarrollo 

 Pesquerol, Contribution 409, 83 p. 

 Angelescu, V., and L. B. Prenski. 



1987. Ecologia trofica de la merluza comiin del Mar Argen- 

 tino (Merlucciidae, Merluccius hubbsi). Parte 2. Dinamica 

 de la alimentacion analizada sobre la base de las condicio- 

 nes ambientales, la estructura y las evaluaciones de los 

 efectivos en su area de distribucion. INIDEP. Contribu- 

 tion 561, 205 p. 



Anonymous. 



1996. Captura 95. Redes 88:24-40. 

 Bezzi, S., G. Canete, M. Perez, M. Renzi, and H. Lassen. 



1994. Report of the INIDEP working group on assessment of 

 hake (Merluccius hubbsi) north of 48'S (Southwest Atlan- 

 tic Ocean). INIDEP Doc. Cient. 3:5-28. 

 Boletzky, S. V. 



1977. Post-hatching behavior and mode of life in cephalo- 

 pods. Symp. Zool. Soc. Lond. 38:557-567 

 Boschi, E. E., C. E. Fischbach, and M. I. lorio. 



1992. Catalogo ilustrado de los crustaceos estomatopodos 

 y decapodos marinos de Argentina. Frente Maritimo 10 

 (sec. A):7-94. 

 Brunetti, N. E. 



1990. Evolucion de la pesqueria de lUe.x nrgentinus (Castel- 

 lanos, 19601. Inf. Teen. Inv. Pesq. 1.55. 19 p. 

 Brunetti, N. E., and M. L. Ivanovic. 



1992. Distribution and abundance of early life stages of 

 squid illlex argentmus} \n the south-west Atlantic. ICES 

 .] Mar. Sci. 49:17.5-183. 

 Campagna, C, and B. J. Le Boeuf. 



1988. Reproductivebehaviorof Southern sea lions. Behav- 

 iour 104:2.3.3-261. 



Canete, G. R., R. G. Perrotta, and J. A. Perez Comas. 



1986. Aspectos comparativos entre muestreos de desem- 

 barque y muestreos en alta mar de la especie merluza (Mer- 

 luccius hubbsi), considerando el descarte efectuado por la 

 flota marplatense en el periodo julio 1979-Setiembre 1980. 

 Publ. Com. Tec. Mix. Fr. Mar. 1:447-453. 

 Cappozzo, H. L., C. Campagna, and J. Monserrat. 



1991. Sexual dimorphism in newborn Southern sea lions. 

 Mar. Mamm. Sci. 7(41:385-394. 

 Clarke, M. R. 



1986. A handbook for the identification of cephalopods beaks. 

 Clarendon Press, Oxford, 273 p. 

 Cortes, E. 



1997. A critical review of methods of studying fish feeding 

 based on analysis of stomach contents: application to elas- 

 mobranch fishes. Can. J. Fish. Aquat. Sci. 54:726-738. 

 Crespo, E. A., J. F. Corcuera, and A. Lopez Cazorla. 



1994. Interactions between marine mammals and fisheries 

 in some coastal fishing areas of Argentina. In Gillnets 

 and cetaceans (W. F Perrin, G. P. Donovan, and J. Barlow, 

 eds.), p. 269-281. Rep. Int. Whal. Comm. (special issue 

 15). 

 Crespo, E. A., and S. N. Pedraza. 



1991. Estado actual y tendencia de la poblacion de lobos 

 marinos de un pelo lOtaria flavescens) en el litoral norpa- 

 tagonico. Ecologia Austral 1:87-95. 

 Crespo, E. A., S. N. Pedraza, S. L. Dans, M. Koen 



Alonso, L. M. Reyes, N. A. Garcia, M. Coscarella, and 

 A. C. M. Schiavini. 



1997. Direct and indirect effects on the high seas fisheries 

 on the marine mammal populations in the northern and 

 central patagonian coast. -J. Northwest Atl. Fish. Sci., 

 22:189-207. 



de Ciechomski, J. D., and R. P. Sanchez. 



1988. Analisis comparativo de las estimaciones de biomasa 

 de la anchoita (Engraulis anchoita) en el Atlantico Sudoc- 

 cidental en diferentes aiios y con distintas metodologias. 

 Publ. Com. Tec. Mix. Fr. Mar. 4:117-132. 

 George-Nascimento, M. F., R. A. Bustamante, and 

 R. C. Oyarzun. 



1985. Feeding ecology of the Southern sea lion Otaria flave- 

 scens Shaw. 1800: food contents and food electivity. Mar. 

 Biol.Prog.Ser. 21:135-143. 

 Hamilton, J. E. 



1934. The Southern sea lion Otaria byronia (de Blainville). 

 Discovery Rep. 8:269-318. 

 Harrison, R. J., and G. L. Kooyman. 



1968. General physiology of the Pinmpedia. In The behav- 

 ior and physiology of pinnipeds (R. J. Harrison. R. C. 

 Hubbard, R. S. Peterson, C. E. Rice, and R. J. Schus- 

 terman, eds.), p 221-296. Appleton-Century-Crofts, New 

 York. NY. 

 Hatfield, E. M. C. 



1996. Towards resolving multiple recruitment into loliginid 

 fisheries: Loligogahi in the Falkland Islands fishery. ICES 

 J. Mar Sci. .53:565-575. 

 Koen Alonso, M., E. A. Crespo, N. A. Garcia, S. N. Pedraza, 

 and M. Coscarella. 



1998. Diet of dusky dolphins, Lagenorhynchus obscurus. in 

 waters off Patagonia, Argentina. Fish. Bull. 96:366-374. 



Ludwig, J. A., and J. F. Reynolds. 



1988. Statistical ecology. John Wiley and Sons, New York, 

 NY, 337 p. 

 Menni, R. C. 



1983. Lospecesenel mediomarino. Estudio Sigma S.R.L., 

 Buenos Aires, Argentina, 169 p. 



