Age, growth and mortality of Hake larvae (&lt;i&gt;Merluccius hubbsi&lt;/i&gt;) in the north Patagonian shelf

Brown, Daniel R.; Leonarduzzi, Ezequiel; Machinandiarena, Laura

doi:10.3989/scimar.2004.68n2273

Cited by 23 publications

(35 citation statements)

References 12 publications

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“…Larval growth analysis for other hake species of the same genus, M. productus, M. bilinearis and M. hubbsi, pooled all the larval stages (Bailey, 1982;Buttler and Nishimoto, 1997;Jeffrey and Taggart, 2000;Brown et al, 2004). The present results on growth rates for Merluccius merluccius larvae using the same approach agree with those results.…”

Section: Discussionsupporting

confidence: 82%

Larval development and growth of the European hake <i>Merluccius merluccius</i> in the northwestern Mediterranean

Palomera¹,

Olivar²,

Morales‐Nin³

2005

Sci. Mar.

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SUMMARY:The larval growth and development of the European hake, Merluccius merluccius, was studied from field larvae. Larvae were collected in the northwestern Mediterranean on three cruises carried out during the peak spawning months (November 1998, September 1999 and November 1999. Like other species of the genus, these larvae are characterised by a well-developed anterior part of the body, head and trunk region. Nevertheless, yolk sac larvae are much more slender than larvae at notochordal flexion stages. In the present study we analysed the allometric relationships between several body measurements and body length. This is the first attempt to infer larval growth of Merluccius merluccius by means of sagittal otolith analysis. Our results show the change in the otolith shape from a lenticular otolith in early larvae to an almond-shaped otolith in larger larvae. Otolith diameter showed a power relation with larval size, with no significant differences between seasons. In spite of the sea surface temperature differences between the three periods of larval collection, the early growth estimates showed no significant differences. This was explained by the similarity in the temperature at the depths at which the larvae are located. Absolute growth rates in length were estimated by relating daily growth increments in otoliths and larval size (standard length). When using the whole larval size range the values obtained were similar to those found for other Merluccius species. Nevertheless, the present data evidenced that growth for larvae younger than 12 days is very low, showing a significant increase thereafter. This indicates that length is probably not the best parameter for describing the growth of hake larvae in the first days of life, as allometric analysis suggested.Keywords: hake, Merluccius merluccius, morphometric, larval growth, larval development, otoliths, age.RESUMEN: DESARROLLO Y CRECIMIENTO LARVARIO DE LA MERLUZA EUROPEA MERLUCCIUS MERLUCCIUS, EN EL MEDITERRÁ-NEO NOROCCIDENTAL. -Se estudió el crecimiento y desarrollo larvario de la merluza europea, Merluccius merluccius, a partir de larvas capturadas en el mar. Las larvas se pescaron en el Mediterráneo noroccidental en tres campañas que se realizaron durante los meses de máxima puesta (Noviembre 1998, Septiembre 1999 y Noviembre 1999). Como otras especies del mismo género, estas larvas se caracterizan por tener la parte anterior del cuerpo, la cabeza y el tronco, bien desarrollada. Sin embargo, las larvas lecitotróficas son mucho más alargadas que las larvas en estado de flexión del notocordio. En este estudio, analizamos las relaciones alométricas entre algunas medidas del cuerpo y la longitud del mismo. Es la primera vez que se realiza un estudio del crecimiento larvario de Merluccius merluccius por medio del análisis de los otolitos sagitta. Nuestros resultados muestran que hay un cambio en la forma del otolito, pasando de forma lenticular en larvas pequeñas a forma almendrada en larvas de mayor tamaño. El diámetro del otolito se relaciona con la...

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Section: Discussionsupporting

confidence: 82%

Larval development and growth of the European hake <i>Merluccius merluccius</i> in the northwestern Mediterranean

Palomera¹,

Olivar²,

Morales‐Nin³

2005

Sci. Mar.

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“…Two groups were defined considering the diet composition and behaviour: Juveniles with lengths of less than 28 cm, and adults with lengths of more than 28 cm (Vaz-dos- Santos et al 2009). (P/B) and diet composition were provided for both groups from Bezzi et al (1994), Brown et al (2004) and Sánches (2009).…”

Section: Study Areamentioning

confidence: 99%

Trophic model of the outer continental shelf and upper slope demersal community of the southeastern Brazilian Bight

Nascimento¹,

Velasco²,

Okey³

et al. 2011

Sci. Mar.

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SUMMARY: It is increasingly recognized that demersal communities are important for the functioning of continental shelf and slope ecosystems around the world, including tropical regions. Demersal communities are most prominent in areas of high detritus production and transport, and they link benthic and pelagic biological communities. To understand the structure and role of the demersal community on the southeastern Brazilian Bight, we constructed a trophodynamic model with 37 functional groups to represent the demersal community of the outer continental shelf and upper slope of this area, using the Ecopath with Ecosim 6 (EwE) approach and software. The model indicates high production and biomass of detritus and benthic invertebrates, and strong linkages of these components to demersal and pelagic sub-webs. The level of omnivory indexes in this ecosystem was high, forming a highly connected trophic web reminiscent of tropical land areas. Although high levels of ascendency may indicate resistance and resilience to disturbance, recent and present fisheries trends are probably degrading the biological community and related ecosystem services.Keywords: modelling, demersal community, Brazil, Brazilian Exclusive Economic Zone, deep sea, ecosystem, southeastern Brazil.RESUMEN: Modelo trófico de la comunidad demersal de la plataforma continental exterior y talud superior de la Cuenca del Sudeste de Brasil. -La importancia de las comunidades demersales para el funcionamiento de los ecosistemas de plataforma continental y talud son reconocidos alrededor del mundo, incluyendo las regiones tropicales. Esas comunidades son más prominentes en áreas con gran producción y transporte de detrito. Para entender la estructura y funcionamiento de la comunidad demersal en la Ensenada Sureste Brasileña, construimos un modelo trofodinámico con 37 grupos funcionales para representar la comunidad demersal de la plataforma continental externa y el talud superior de esa región, utilizando el paquete Ecopath con Ecosim 6 (EwE). El modelo indica que el detrito y los invertebrados son muy abundantes e importantes en la estructura de este ecosistema. El nivel de omnivoría encontrado en este ecosistema fue alto, conformando una red trófica altamente conectada, a semejanza del de las áreas tropicales terrestres.Palabras clave: modelización, comunidad demersal, Brasil, ZEE de Brasil, aguas profundas, ecosistema, Sudeste de Brasil.

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“…The second is the demersal ring II, previously named demersal. The reasons for demersal ring formation are still unknown according to the most recent studies on M. hubbsi's growth (Lorenzo, 2003;Brown et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

“…Francis (1995) had criticized it, pointing out that this assertion was only a conjecture and dependent on detailed knowledge of early growth. Brown et al (2004) calculated Lo' and Ro' in larvae of M. hubbsi from Argentina, obtaining 2.0 mm and 7.7 mm, respectively. We have considered it inappropriate to use these values for Brazilian hake, since it is better to use values calculated for the same area; so in the present study the biological intercept was adopted from the values obtained from the smallest fish ever captured in our samples, used earlier with success by Vaz-dos-Santos (2002).…”

Section: Discussionmentioning

confidence: 99%

“…As with other hakes elsewhere in the world (Alheit & Pitcher, 1995), M. hubbsi is of great commercial importance in these two countries (Csirke, 1987), where many studies have been published about its reproductive habits and behavior (from Ciechomski, 1967to Macchi et al, 2006, feeding habits (Angelescu & Fuster de Plaza, 1965;Angelescu & Cousseau, 1969;Angelescu & Prenski, 1987;Prenski & Bezzi, 1991;Prenski & Angelescu, 1993;Ruiz & Fondacaro, 1997;Sánchez & García de La Rosa, 1999), identification of stocks (Bezzi & Perrotta, 1983;Perrotta & Sánchez, 1992;Gutiérrez et al, 1995;Norbis et al, 1999;Sardella & Timi, 2004); general biology and management (Rey et al, 1996;Rey & Arena, 1999;Aubone et al, 2000;Aubone et al, 2004;Bezzi et al, 2004;Sabatini, 2004) and biomass estimations (Arena et al, 1987;Rey et al, 1987;Bezzi & Ibáñez, 2003). Many growth studies have been undertaken by Otero (1977), Gaggiotti & Renzi (1990), Renzi & Pérez (1992), Villarino & Giussi (1992), Giussi et al (1994), Torres et al (1996), Norbis et al (1999), Renzi et al (1999), Lorenzo (2003) and Brown et al (2004).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Age and growth of the Argentine hake Merluccius hubbsi Marini, 1933 in the Brazilian South-Southeast Region during 1996-2001

Vaz‐dos‐Santos

Rossi-Wongtschowski

2007

Neotrop. ichthyol.

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This is the first detailed study on the age and growth of the Argentine hake Merluccius hubbsi in Brazilian waters. A total of 3,651 specimens obtained from surveys and sampling landings using trawlers and long-lines in the South-Southeast Region (21°S to 34°S) between 1996 and 2001 were analyzed. Readings of sliced and burned otoliths were conducted on 686 individuals (397 females, 129 males and 160 young -sex not identified), identifying opaque and translucent zones. Marginal increment and edge type percentage methods were used for validation, resulting in one ring per year, formed during summer-autumn. Fish with no more than eight rings and six years of age were found, the two first rings after the core being formed during the first year. Back-calculation methods were applied to length/age data and the parameters of von Bertalanffy's growth model were fitted based on average length per ring. The value of maximum theoretical length varied between 470.27 mm and 807.40 mm; growth coefficient varied from 0.1657 to 0.3555 year -1 and the theoretical age at length zero between -1.2846 and -0.4552 years. Growth of females and males differed significantly. The techniques applied and the results obtained are discussed and compared with studies on hake conducted in Uruguay and Argentina, providing important information for the management of the species in Brazil, where it presents clear signs of overexploitation.Este é o primeiro estudo detalhado sobre a idade e o crescimento da merluza Merluccius hubbsi no Brasil. Foram analisados 3.651 espécimes obtidos em cruzeiros de pesquisa e provenientes das frotas de arrasto e espinhel de fundo da região SudesteSul do Brasil (21°S a 34°S) entre 1996 e 2001. Leituras de secções transversais de otólitos (corte, polimento e queima) foram realizadas para 686 indivíduos (397 fêmeas, 129 machos e 160 jovens com sexo não identificado), identificando-se zonas opacas e translúcidas. Foram calculados o incremento marginal e a porcentagem do tipo de borda, no tempo, para validação, resultando em um anel por ano, formado durante o verão-outono. Foram obtidos peixes com até oito anéis e seis anos de idade, sendo que os dois anéis depois do núcleo se formam durante o primeiro ano de vida. Foram aplicados métodos de retrocálculo aos dados de comprimento na idade e os parâmetros do modelo de von Bertalanffy foram estimados. O valor do comprimento máximo teórico variou entre 470,27 mm e 807,40 mm; a taxa de crescimento variou de 0,1657 a 0,3555 ano -1 e a idade teórica de comprimento zero entre -1,2846 e -0,4552 anos. O crescimento de fêmeas e machos difere significativamente. As técnicas aplicadas e os resultados obtidos foram discutidos, sendo comparados com estudos realizados no Uruguai e na Argentina e provendo informação importante para a gestão da espécie no Brasil, onde a merluza apresenta claros sinais de sobrepesca.

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Age, growth and mortality of Hake larvae (<i>Merluccius hubbsi</i>) in the north Patagonian shelf

Cited by 23 publications

References 12 publications

Larval development and growth of the European hake <i>Merluccius merluccius</i> in the northwestern Mediterranean

Larval development and growth of the European hake <i>Merluccius merluccius</i> in the northwestern Mediterranean

Trophic model of the outer continental shelf and upper slope demersal community of the southeastern Brazilian Bight

Age and growth of the Argentine hake Merluccius hubbsi Marini, 1933 in the Brazilian South-Southeast Region during 1996-2001

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