Variations in larval walleye pollock feeding and condition: a synthesis

Theilacker, Gail H.; Bailey, Kevin M.; Canino, Michael F.; Porter, Steven M.

doi:10.1111/j.1365-2419.1996.tb00086.x

Cited by 75 publications

(59 citation statements)

References 36 publications

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“…Bailey and Houde 1989), there has been little unambiguous field evidence consistent with Hjort's theory, which is now termed the "critical-period" hypothesis (Leggett and DeBlois 1994). Some of the best evidence is derived from multi-year surveys of walleye pollock larvae, which show that young fish can be very vulnerable to starvation in the first 2 weeks after they begin feeding (Theilacker et al 1996). Reasons why field studies have not provided clear results include the difficulties of accurately measuring the availability of food for larvae and disentangling the effects of dispersal and mortality within the plankton (Heath 1992;Helbig and Pepin 1998a, b).…”

Section: Discussionmentioning

confidence: 99%

Larval growth predicts the recruitment success of a coral reef fish

et al. 2002

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Abstract. While growth rates of pelagic larvae have been argued to be one of the principal determinants of the recruitment success of temperate marine fishes, it is not known if this is the case in the tropics. Here, we use larval growth histories derived from otoliths of a Caribbean reef fish to show that monthly variation in the intensity of settlement and recruitment of pelagic juveniles onto reefs is positively correlated with variation in growth rates 1-2 weeks after larvae begin feeding. Our results suggest that the processes thought to underlie recruitment of marine fishes in temperate regions may also operate in the tropics and contrasts with current research on the causes of recruitment variability in coral reef fishes, which emphasises the role of larval transport.

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Section: Discussionmentioning

confidence: 99%

Larval growth predicts the recruitment success of a coral reef fish

et al. 2002

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“…Nutrient upwelling in the cyclonic eddy may have sustained production trapped in surface waters during the protracted period of closed recirculation. The relatively high density of fishes in the eddy could then have been a consequence of high food availability and feeding success (Theilacker et al 1996, McLaren et al 1997. We hypothesize that fish growth was enhanced in the persistent eddy and survivorship was increased (Houde 1997, Sogard 1997) amidst poor circumstances for the populations of pelagic early life history stages elsewhere in the region.…”

Section: Sequential Events and Survivorshipmentioning

confidence: 99%

Patterns of coastal eddy circulation and abundance of pelagic juvenile fish in the Santa Barbara Channel, California, USA

Nishimoto¹,

Washburn²

2002

Mar. Ecol. Prog. Ser.

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Annual midwater trawling surveys (sampling at depths of 20 to 40 m) in early summer 1998 and 1999 revealed strong interannual variability in the patterns of abundance of late-stage larval and juvenile fishes in the Santa Barbara Channel. In June 1998, sampling revealed high concentrations of fishes in the center of a cyclonic eddy in the western Channel corresponding to the lowest dynamic height in the study area. In contrast, eddy circulation was not consistent during the second survey in June 1999, and high concentrations of fishes were not observed. Patterns of evolving surface currents, observed by high frequency radar and concurrent CTD sampling during the trawling surveys, suggest that interannual variability in fish abundance within the Santa Barbara Channel resulted from local retention in 1998, but not in 1999. Time series of relative vorticity (a measure of eddy rotation) computed from surface current fields indicates that the cyclonic eddy observed during the 1998 survey was a stable, persistent feature developing about 6 wk before the trawling surveys. We speculate that the closed circulation of the eddy in 1998 retained larval and juvenile fishes from about late April until late June. In 1999, trains of smaller eddies propagated across the region beginning in mid-May, lasting through the survey period. Given their size and circulation strength, the propagating eddies probably disrupted the closed circulation in the western Channel. These observations indicate a strong link between coastal mesoscale flows and spatial abundance patterns of juvenile and late-stage larval fishes.

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“…This result corresponds well with the 4 to 5 h described for field collected walleye pollock (Canino & Bailey 1995). Optimal prey density for feeding was predicted to be between 15 and 20 l -1 , which is slightly lower than the proposed prey densities (> 20 prey l -1 ) required for walleye pollock larvae in Shelikof Strait, Gulf of Alaska, to be in healthy condition (Theilacker et al 1996). The model also predicted increased numerical feeding intensity with increasing larval size, indicating that the predatory performance of larval walleye pollock might improve with progressing ontogeny.…”

Section: Discussionmentioning

confidence: 94%

Environmental factors influencing larval walleye pollock Theragra chalcogramma feeding in Alaskan waters

Porter

Ciannelli²,

Hillgruber³

et al. 2005

Mar. Ecol. Prog. Ser.

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This study examines potential interactions among the environmental variables likely to affect larval walleye pollock Theragra chalcogramma feeding in the sea. Walleye pollock larvae were sampled from Shelikof Strait, Gulf of Alaska, and from the eastern Bering Sea, with corresponding environmental data. Variables used in our study were time spent feeding, seawater temperature, light, prey density, wind speed and standard length of the larvae. We applied an additivity test to detect the presence of potential interactions among these variables and adopted an expansion of generalized additive models (GAMs) that allowed the inclusion of interaction terms in a non-parametric regression analysis. After testing all possible 2-way interactions among these variables, we found 4 significant terms: (1) time feeding-standard length, (2) temperature-light, (3) light -wind speed and (4) prey density-standard length. The most influential interaction term was the light -wind speed interaction, which caused a decrease of the model-generalized cross-validation (GCV, whereby lower values indicate more parsimonious models) from 0.0402 (for a model with all variables but no interaction term) to 0.0290 (for a model with all variables and this interaction), and an increase of the model explained variance by 7% (R 2 = 0.89 versus 0.82). This result indicates that the effect of wind speed (turbulence) on larval walleye pollock feeding is dependent upon the amount of light available. This may be due to vertical movements in the water column by both walleye pollock larvae and their prey in response to turbulence. KEY WORDS: Larval fish feeding · Walleye pollock larvae · Generalized additive models Resale or republication not permitted without written consent of the publisher

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Variations in larval walleye pollock feeding and condition: a synthesis

Cited by 75 publications

References 36 publications

Larval growth predicts the recruitment success of a coral reef fish

Larval growth predicts the recruitment success of a coral reef fish

Patterns of coastal eddy circulation and abundance of pelagic juvenile fish in the Santa Barbara Channel, California, USA

Environmental factors influencing larval walleye pollock Theragra chalcogramma feeding in Alaskan waters

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