Feeding strategy of juvenile (age‐0+ year) Argentine hake<i>Merluccius hubbsi</i>in the Patagonian nursery ground

Temperoni, Brenda; Viñas, María Delia; Buratti, Claudio

doi:10.1111/jfb.12238

Cited by 17 publications

(5 citation statements)

References 49 publications

(59 reference statements)

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“…It has been suggested that this distribution might respond to certain temperature and salinity ranges as well as to zooplankton prey concentrations (Louge et al, 2011). Pre-recruits prey mainly upon euphausiids and amphipods during austral summer, although decapods are included in the diet in a lower proportion (Temperoni et al, 2013). However, the spatial variability of these macrozooplankton prey within the SJG is poorly known (Pérez Seijas et al, 1987;Viñas et al, 1992 2 | MATERIALS AND METHODS…”

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confidence: 99%

Effect of nursery ground variability on condition of age 0+ year Merluccius hubbsi

Temperoni

Massa

Derisio

et al. 2018

Journal of Fish Biology

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This study examined the southern or Patagonian (41°–55° S) stock of Argentine hake Merluccius hubbsi, the more abundant of the two stocks on the Argentinean continental shelf. Pre‐recruits (age 0+ year individuals) of this stock settle and grow in the San Jorge Gulf (45°–47° S, 65° 30′ W), a complex habitat with large spatial variability in environmental features. Relative condition factor, hepatosomatic index, lipid content and fatty‐acid composition of muscle and liver, and diet information were combined with physical and biological data to evaluate: how nutritional status of age 0+ year hake varies spatially within the nursery ground; whether changes in condition are related to environmental factors and feeding; whether the indices are interchangeable metrics of condition. Both morphometric and biochemical indices showed dissimilar spatial trends; enhanced liver‐based condition coincided with low salinity nutrient rich waters, higher chlorophyll‐a values and abundances of Euphausia spp., the preferred prey at most stations, suggesting a bottom‐up effect on age 0+ year hake condition. Diminished condition at stations where Thermisto gaudichaudii was the main prey could derive from lower prey quality in terms of energy density and essential fatty acids content. Coastal waters of the gulf would be essential habitats for M. hubbsi pre‐recruits. Future monitoring of condition with liver‐based indices is encouraged in the gulf, where interannual increasing trends of satellite‐derived chlorophyll‐a values have been observed, which could have implications for recruitment of the species.

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confidence: 99%

Effect of nursery ground variability on condition of age 0+ year Merluccius hubbsi

Temperoni

Massa

Derisio

et al. 2018

Journal of Fish Biology

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“…Adult M. hubbsi feed primarily on pelagic crustaceans, squid, and fish such as anchovy, whereas young larvae prey on zooplankton, incorporating mainly copepods <2 mm in length. Young juveniles incorporate larger zooplankton, mostly the euphausiid Euphausia lucens and the amphipod Themisto gaudichaudii (Viñas & Santos, 2000;Temperoni, Viñas, & Buratti, 2013). Another important factor for fish that are commercially exploited is fishing pressure, which can influence recruitment indirectly by altering the stock reproductive potential and the abundance of spawning individuals, or directly by affecting the abundance of juveniles.…”

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confidence: 99%

Influence of environmental conditions on the reproductive success and recruitment of the Argentine hake Merluccius hubbsi (southwestern Atlantic Ocean)

Marrari

Macchi

Santos

et al. 2018

Fisheries Oceanography

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The Argentine hake Merluccius hubbsi represents the dominant demersal fish and one of the main fisheries in the Argentine Sea. We analyzed over 17 years (September 1997–February 2015) of satellite surface chlorophyll concentration (CHL) and sea surface temperature anomaly (SSTA) data in the main spawning (SUB) and nursery (SJG) areas of the Patagonian stock of M. hubbsi. The variability observed in these environmental conditions was related to interannual differences in the reproductive success of hake. CHL values were maximum during austral spring (October–November) and minimum during winter (June–August). Blooms started in late September and lasted on average 128 and 110 days at SUB and SJG, respectively. At SUB, average CHL at the time of reproduction, the day of occurrence of the maximum chlorophyll concentration, and fall SST anomalies were significantly related to recruitment (RVPA) a year later and to two Larval Survival Indices (LSISSB and LSITEP) considered. At SJG, RVPA, LSISSB, and LSITEP showed negative correlations with fall (March–May) SSTA. Total egg production was not related to fall SSTA or spring phytoplankton dynamics at SUB or SJG. Significant positive trends were observed in the time series of CHL and SSTA in the study area. The trends observed in CHL represent average increases of 40.7% and 35.7% since 1997 at SUB and SJG, respectively. The potential implications of long‐term changes in environmental conditions for hake reproductive success are discussed.

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“…Moreover, pelagic YOY hakes were found distributed closer to the bottom during the warm season (10.9 m) than during the cold season (14.1 m), with reduced mean densities, probably given to natural mortality and progressive recruitment to the demersal habitat. The main prey found in the diet of the Argentine hake M. hubbsi off SJG in south‐western Atlantic were in accordance with those reported previously (Belleggia et al ., 2014; Belleggia et al ., 2017; Belleggia et al ., 2019; Ruiz & Fondacaro, 1997; Sánchez, 2009; Sánchez & García de la Rosa, 1999; Sánchez & Prenski, 1996; Temperoni et al ., 2013).…”

Section: Discussionmentioning

confidence: 99%

“…The digitized acoustic data were recorded with the BEI software (Bergen Echo Integrator; Foote et al ., 1991) and processed with the Echoview 4.1 software. The frequency response and target strength distributions of the acoustic echo traces were used to scrutinize and in the interpretation of echograms, with further validation from the catches of pelagic net trawls, the specific composition of the stomach contents of the juvenile hake caught, as well as previous experience on the pelagic distribution of juvenile hake and macro‐zooplankton (Álvarez‐Colombo, 2013; Álvarez‐Colombo et al ., 2014; Belleggia et al ., 2019; Cabreira et al ., 2011; Padovani et al ., 2015; Sabatini & Alvarez‐Colombo, 2001; Temperoni et al ., 2013). The echograms, often showing mixed juvenile hake and macro‐zooplankton distributions, were classified based on the frequency dependence of the acoustic targets, in terms of relative frequency response (r f ) or dB‐difference (Brierley & Watkins, 1996; Everson et al ., 1993; Korneliussen, 2018; Korneliussen & Ona, 2002; Madureira et al ., 1993; McQuinn et al ., 2013).…”

Section: Methodsmentioning

confidence: 99%

“…The Argentine hake of the Patagonian stock feeds mainly on zooplanktonic crustaceans such as the hyperiid amphipods Themisto gaudichaudii , euphausiids Euphausia lucens , and sergestid shrimp Peisos petrunkevitchi (Belleggia et al ., 2014; Ruiz & Fondacaro, 1997; Sánchez, 2009; Sánchez & García de la Rosa, 1999; Sánchez & Prenski, 1996; Temperoni et al ., 2013). The Argentine hake exhibited ontogenetic shifts with increased consumption of fish and cephalopods with predator size (Angelescu & Cousseau, 1969; Belleggia et al ., 2014; Sánchez, 2009; Sánchez & García de la Rosa, 1999) and seasonal changes related to prey availability (Belleggia et al ., 2014; Sánchez & Prenski, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Who let the young‐of‐the‐year (YOY) up? The pelagic habitat as a nursery and feeding ground area for the YOY Argentine hake Merluccius hubbsi Marini, 1933

Belleggia

Álvarez-Colombo

Betina

et al. 2021

Journal of Fish Biology

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The young‐of‐the‐year (YOY) Argentina hake Merluccius hubbsi remained at particular distances off the seabed at pelagic habitat, in a nursery area located in the San Jorge Gulf off south‐western Atlantic. Older specimens were daylight distributed near the bottom in the demersal habitat. In this paper the authors show that the pelagic habitat is favourable for YOY hake compared to the surrounding demersal habitat by decreasing the probability of encounter with larger hake protecting the YOY against conspecific predation, and providing a better food supply. From 303 stomachs of pelagic YOY Argentine hake analysed (60–250 mm), 274 (90.43%) contained prey. Pelagic Argentine YOY hake fed almost exclusively on zooplanktonic crustaceans (Euphausia spp. and Themisto gaudichaudii). From 980 demersal specimens (14–82 cm), 572 (58.36%) contained prey, mainly the lobster krill Munida gregaria, followed by other hakes by cannibalism. The intensity of feeding was higher on pelagic layers. The allometric weight–length relationship revealed that the YOY Argentine hake find sufficient food in the pelagic habitat to live and develop, by increasing their relative body thickness. The cannibalism increases from close to zero when the YOY hake are c. 20 m off the seabed, to between 15% (cold season) and 20% (warm season) when they are 10 m off the seabed. These results suggest that the pelagic habitat is a feeding ground for YOY hake, and it is a favourable one compared to the surrounding demersal habitat by protecting the YOY from cannibalism. Pelagic YOY hakes were less abundant and more distant from the bottom during the cold season (14.3 m) than during warm one (11.4 m), probably because of natural mortality and progressive recruitment to demersal habits.

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Feeding strategy of juvenile (age‐0+ year) Argentine hakeMerluccius hubbsiin the Patagonian nursery ground

Cited by 17 publications

References 49 publications

Effect of nursery ground variability on condition of age 0+ year Merluccius hubbsi

Effect of nursery ground variability on condition of age 0+ year Merluccius hubbsi

Influence of environmental conditions on the reproductive success and recruitment of the Argentine hake Merluccius hubbsi (southwestern Atlantic Ocean)

Who let the young‐of‐the‐year (YOY) up? The pelagic habitat as a nursery and feeding ground area for the YOY Argentine hake Merluccius hubbsi Marini, 1933

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