Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-28T00:21:16.547Z Has data issue: false hasContentIssue false
  • English
  • Français

The spatio-temporal distribution of juvenile hake(Merluccius gayi gayi) off central southern Chile(1997–2006)

Published online by Cambridge University Press:  18 July 2011

Marcelo A. San Martín ,
Luis A. Cubillos  and
Juan Carlos Saavedra
Marcelo A. San Martín
Affiliation:
Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile
Luis A. Cubillos*
Affiliation:
EPOMAR, Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile
Juan Carlos Saavedra
Affiliation:
Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile
*
a Corresponding author:[email protected]
Get access

Abstract

The Chilean hake (Merluccius gayi gayi) is the predominant groundfishspecies inhabiting the southern Humboldt, mainly from Coquimbo (29° S) to Puerto Montt(42° S). At present there is only limited knowledge on the spatial distribution ofjuveniles of this species, particularly concerning its dependence on key physicalcharacteristics. On the basis of annual surveys carried out during austral winters from1997 to 2006, changes in the presence of juveniles were studied using Generalized AdditiveModel techniques. Temporal factors and spatial effects were more important than singlephysical variables in explaining the presence of juvenile hake (<34 cm totallength). Juvenile hake had a preference for shallower waters. Although salinity and oxygenwere significant, their contribution was marginal. Juvenile hake seem to prefer shallowoxygenated waters, but the nonlinear relationships and partial secondary peaks detected insalinity and oxygen probably only reflected the influence of three water masses found inthe winter habitat. Endogenous factors could be more important in determining temporal andspatial changes in the proportion of juvenile hake. An important change in the presence ofjuveniles has occurred since 2004, coinciding with a significant decline in biomass ofadult hake. It is postulated that cannibalism pressure from adults has probably declinedand that spatial and temporal changes in the presence of juvenile hake seem to be moreassociated with fishery-induced demographic effects.

Keywords

Acoustic surveyFish distributionMidwater trawlPresence-absenceHakeGAM
Type
Research Article
Information
Aquatic Living Resources , Volume 24 , Issue 2 , April 2011 , pp. 161 - 168
Copyright
© EDP Sciences, IFREMER, IRD 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Abella, A., Serena, F., Ria, M., 2005, Distributional response to variations in abundance over spatial and temporal scales for juveniles of European hake (Merluccius merluccius) in the western Mediterranean Sea. Fish. Res. 71, 295–310. CrossRefGoogle Scholar
Alheit J., Pitcher T.J. (eds.), 1995, Hake, biology, fisheries and markets. Fish Fish. Ser. 15, Chapman and Hall, London, pp. 15–478.
Arancibia, H., Fuentealba, M., 1993, Análisis de la alimentación de Merluccius gayi gayi (Guichenot 1848) de Chile central, en el largo plazo. Biol. Pesq. 22, 5–11. Google Scholar
Bartolino, V., Ottavi, A., Colloca, F., Ardizzone, G.D., Stefánsson, G., 2008, Batymetric preferences of juvenile European hake (Merluccius merluccius). ICES J. Mar. Sci. 65, 963–969. CrossRefGoogle Scholar
Cubillos, L.A., Rebolledo, H., Hernández, A., 2003, Prey composition and estimation of Q/B for the Chilean hake, Merluccius gayi (Gadiformes-Merluccidae), in the central-south area off Chile (34°–40° S). Arch. Fish. Mar. Res. 50, 271–286. Google Scholar
Escribano, R., Daneri, G., Farías, L., Gallardo, V.A., González, H.E., Gutiérrez, D., Lange, C.B., Morales, C.E., Pizarro, O., Ulloa, O., Braun, M., 2004, Biological and chemical consequences of the 1997–1998 El Niño in the Chilean coastal upwelling system: a synthesis. Deep Sea Res. II. 51, 2389–2411. CrossRefGoogle Scholar
Faúndez-Báez, P., Morales, C., Arcos, D., 2001, Variabilidad espacial y temporal en la hidrografía invernal del sistema de bahías frente a la VIII región (Chile-centro-sur). Rev. Chil. Hist. Nat. 74, 817–831. CrossRefGoogle Scholar
Gillanders, B.M., Able, K.W., Brown, J.A., Eggleston, D.B., Sheridan, P.F., 2003, Evidence of connectivity between juvenile and adult habitats for mobile marine fauna: an important component of nurseries. Mar. Ecol. Prog. Ser. 247, 281–295. CrossRefGoogle Scholar
Ihaka, R., Gentleman, R., 1996, R: A language for data analysis and graphics. J. Comput. Graph Stat. 5, 299–314. Google Scholar
Jurado-Molina, J., Gatica, C., Cubillos, L., 2006, Incorporating cannibalism into age-structured model for the Chilean hake. Fish. Res. 82, 30–40. CrossRefGoogle Scholar
Lillo S., Bahamonde R., Olivares J., Saavedra J., Molina E., Díaz E., Braun M., Núñez S., Navarro E., Vásquez S., Sepúlveda A., Alarcón R., Saavedra A., 2007, Evaluaciones hidroacústicas de merluza común, año 2006. Inf. Téc. FIP-IT/2006-03, (http://www.fip.cl)
Lillo S., Saavedra J., Molina E., Olivares J., Díaz E., Núñez S., Navarro E., Vásquez S., Alarcón R., Sepúlveda A., Braun M., Saavedra A., 2009a, Evaluaciones hidroacústicas de merluza común, año 2007. Inf. Téc. FIP-IT/2007-16, (http://www.fip.cl)
Lillo S., Molina E., Saavedra J., Olivares J., Díaz E., Núñez S., Navarro E., Vásquez S., Alarcón R., Sepúlveda A., Braun M., Saavedra A., 2009b, Evaluaciones hidroacústicas de merluza común, año 2008. Inf.Téc. FIP-IT/2008-14, (http://www.fip.cl)
Quiñones, R.A., Montes, R., 2001, Relationship between freshwater input to the coastal zone and the historical landings of the benthic/demersal fish Eleginops maclovinus in central-south Chile. Fish. Oceanogr. 10, 311–328. CrossRefGoogle Scholar
Shima, M., Babcock-Hollowed, A., VanBlaricom, G.R., 2002, Changes over time in the spatial distribution of walleye pollock (Theragra chalcogramma) in the Gulf of Alaska, 1984–1996. Fish. Bull. 100, 307–323. Google Scholar
Silva, N., Neshyba, S., 1979, On the southernmost extension of the Peru-Chile undercurrent. Deep Sea Res. Part A. 26, 1387–1393. Google Scholar
Strub P.T., Mesias J.M., Montecino V., Rutlant J., Salinas S., 1998, Coastal and ocean circulation off western South America. In: Robinson R, Brink KH (eds.), The Global Coastal Ocean – Regional Studies and Synthesis, Vol. 11, John Wiley, New York, pp. 273–313.
Wood, S.N., 2000, Modelling and smoothing parameter estimation with multiple quadratic Penalties. J. R. Stat. Soc. B 62, 413–428. CrossRefGoogle Scholar
Wood, S.N., 2003, Thin-plate regression splines. J. R. Stat. Soc. B 65, 95–114. CrossRefGoogle Scholar
Wood S.N., 2006, Generalized additive models. An introduction with R. Chapman and Hall/CRC.
Wood, S.N., Augustin, N.H., 2002, GAMs with integrated model selection using penalized regression splines and applications to environmental modelling. Ecol. Model. 157, 157–177. CrossRefGoogle Scholar