scholarly journals Effect of prey abundance and size on the growth and survival of larval fish: an experimental study employing large volume enclosures

1986 ◽  
Vol 34 ◽  
pp. 11-22 ◽  
Author(s):  
KT Frank ◽  
WC Leggett
Keyword(s):  
Experimental Study ◽  
Large Volume ◽  
Larval Fish ◽  
Prey Abundance ◽  
Growth And Survival

scholarly journals Match–Mismatch Regulation for Bluegill and Yellow Perch Larvae and Their Prey in Sandhill Lakes

2010 ◽  
Vol 1 (2) ◽  
pp. 73-85 ◽  
Author(s):  
Jeffrey C. Jolley ◽  
David W. Willis ◽  
Richard S. Holland
Keyword(s):  
Yellow Perch ◽  
Prey Selection ◽  
Larval Fish ◽  
Lepomis Macrochirus ◽  
Perca Flavescens ◽  
Stomach Contents ◽  
Zooplankton Abundance ◽  
Growth And Survival ◽  
Fish Recruitment ◽  
Newly Hatched Larvae

Abstract Food availability may regulate fish recruitment, both directly and indirectly. The availability of zooplankton, especially to newly hatched larvae, is thought to be crucial to their early growth and survival. We examined stomach contents of larval bluegill Lepomis macrochirus and yellow perch Perca flavescens in Pelican Lake and Cameron Lake, Nebraska, in 2004 and 2005. We also determined zooplankton availability and calculated prey selection using Chesson's α. In addition, we investigated potential match–mismatch regulation of recruitment from 2004 to 2008. Bluegill positively selected copepod nauplii and Bosmina spp., and yellow perch often selected copepods. Abundant zooplankton populations were available for consumption. Matches of both larval bluegill and yellow perch abundance to zooplankton abundance were detected in all years; exact matches were common. Mismatches in predator and prey production were not observed. Predation by age-0 yellow perch on age-0 bluegill was not observed, even though yellow perch hatched 2 mo prior to bluegill. Given that zooplankton were abundant and well-timed to larval fish relative abundance over the time span of this study, the match–mismatch hypothesis alone may not fully account for observed recruitment variability in these populations. Environmental conditions may also affect recruitment and warrant further investigation.

Experimental study on the pressure-generation efficiency and pressure-seal mechanism for large volume cubic press

2018 ◽  
Vol 89 (7) ◽  
pp. 075106 ◽  
Author(s):  
Jiawei Zhang ◽  
Fangming Liu ◽  
Jingjun Wu ◽  
Yinjuan Liu ◽  
Qiwei Hu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Large Volume ◽  
Generation Efficiency ◽  
Pressure Seal

A Large-Volume Pump System for Studies of the Vertical Distribution of Fish Larvae Under Open Sea Conditions

1986 ◽  
Vol 66 (4) ◽  
pp. 845-854 ◽  
Author(s):  
R. P. Harris ◽  
L. Fortier ◽  
R. K. Young
Keyword(s):  
Water Column ◽  
Large Volume ◽  
Larval Fish ◽  
Fish Larvae ◽  
Physical Structure ◽  
Small Scale ◽  
Fine Scale ◽  
Pump System ◽  
Open Sea ◽  
Temporal And Spatial

A large-volume pump system (2.8 m3 min-1) for sampling fish larvae under open-sea conditions is described. Comparative efficiency trials by day and night showed that the pump was generally as efficient, or in some cases more efficient, in capturing larvae than vertically hauled 200 μm WP2 nets, though there was some evidence of visual avoidance by particular larval size classes during daylight. The pump system is particularly appropriate for investigating fine-scale vertical aggregations (1–10 m3) of larval fish in relation to the distribution of their food organisms.INTRODUCTIONStudies of the distribution of larval fish and their food organisms in relation to physical structure in the water column require sampling techniques capable of resolving fine-scale temporal and spatial distributions. As an alternative to conventional nets, large-volume pumps, sampling at rates in excess of 1 m3 min-1; provide such a capability. Major benefits of using large pumps in addition to temporal and spatial resolution are that a wide range of sizes of plankton including larval fish can be sampled simultaneously in relation to physical and chemical properties of the water column; there is reliable control of the volume of sample filtered and problems of clogging of towed nets are avoided; long series of sequential samples can be taken in studies of small-scale distribution; and instrumentation with in situ CTD and fluorometers at the intake enables real-time control of sampling in relation to physical structure.General engineering considerations for using such pumps have been reviewed in detail by Miller & Judkins (1981), and a particular area of application has been in power-plant entrainment studies in shallow fresh water (Portner & Rhode, 1977; Bowles & Merriner, 1978; Gale & Mohr, 1978; Ney & Schumacher, 1978; Elder et al. 1979; Leithiser, Ehrlich & Thum, 1979; Cada & Loar, 1982).

Experimental study of large-volume microwave ablation in the liver

2002 ◽  
Vol 89 (8) ◽  
pp. 1003-1007 ◽  
Author(s):  
A. D. Strickland ◽  
P. J. Clegg ◽  
N. J. Cronin ◽  
B. Swift ◽  
M. Festing ◽  
...  
Keyword(s):  
Experimental Study ◽  
Large Volume ◽  
Microwave Ablation

scholarly journals Effects of Microplastics on the Feeding Rates of Larvae of a Coastal Fish: Direct Consumption, Trophic Transfer, and Effects on Growth and Survival

2021 ◽  
Author(s):  
Christine Uy ◽  
Darren Johnson
Keyword(s):  
Larval Fish ◽  
Trophic Transfer ◽  
Control Group ◽  
Feeding Rates ◽  
Lower Growth ◽  
Larval Phase ◽  
Coastal Fish ◽  
Growth And Survival ◽  
Low Concentrations ◽  
High Concentrations

Abstract Microplastics are now found throughout the world’s oceans, and although many organisms ingest microplastics, less is known about how plastics in seawater may affect key processes such as feeding rate, growth, and survival. We used a series of laboratory experiments to test whether microplastics in seawater affected the feeding rates of larvae of the California Grunion, Leuresthes tenuis. In addition, we tested whether trophic transfer of microplastics from zooplankton to larval fish can occur and affect growth and survival of fish. We measured feeding rates of grunion larvae at various concentrations of 75–90 µm and 125–250 µm polyethylene microplastics and under both still water and turbulent conditions. In these experiments, exposure to microplastics had modest effects on feeding rates, though responses may be somewhat complex. Low concentrations of microplastics increased feeding rates compared to the control, but at higher concentrations, feeding rates were indistinguishable from those in the control group though effects were small compared to natural variation in feeding rates among individual fish. Experiments to test for trophic transfer of microplastics revealed that grunion larvae that were fed brine shrimp exposed to high concentrations of microplastics had lower growth rates and elevated mortality rates. Overall, our results suggest that the direct effects of microplastics on feeding rates of California Grunion during the early larval phase are minor, while the trophic transfer of microplastics from zooplankton to larval fish may have significant effects on their growth and survival.

scholarly journals Kombinasi pakan terhadap pertumbuhan dan kelangsungan hidup larva ikan Lele Sangkuriang (Clarias gariepinus)

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Risaldo Tjodi ◽  
Ockstan J Kalesaran ◽  
Juliaan Ch Watung
Keyword(s):  
Larval Fish ◽  
Clarias Gariepinus ◽  
Larval Survival ◽  
Growth And Survival

This study aimed to determine the best combination of feed on the growth and survival of larval fish catfish (Clarias gariepinus). This study  used completely randomized with six treatments including treatment A: Artemia, B: Tubifex C: Pellet, D:  combination of (50%) Artemia + (50%) Tubifex, E:  combination of (50%) Artemia + (50%) Pellet, and      F:  combination of (50%) Tubifex + (50%) Pellet. Each treatment consisted of three replications. The result showed that the combination of  50% artemia + 50% tubifex could promote the growth length of larvae of 4,003 cm, weight of larval of 0.633 g,  and larval survival was 79%.  This combination was the best combination for the growth and survival of catfish larvae.   Keywords: Combination of feed, Clarias gariepinus, larvae, growth, survival

scholarly journals Can behavioural ecology unite hypotheses for fish recruitment?

2013 ◽  
Vol 71 (4) ◽  
pp. 909-917 ◽  
Author(s):  
Christian Jørgensen ◽  
Anders Frugård Opdal ◽  
Øyvind Fiksen
Keyword(s):  
Predation Risk ◽  
Food Availability ◽  
Larval Fish ◽  
High Growth ◽  
Selective Predation ◽  
Growth And Survival ◽  
Larval Behaviour ◽  
Fish Recruitment ◽  
Trade Offs ◽  
Risk Of Predation

Abstract Since the classical works by Hjort linked the survival of early life stages of fish to year-class strength and recruitment, fisheries science has struggled to understand the fate of fish eggs and larvae. Here we discuss how food availability will influence growth and survival of larvae when foraging behaviour is flexible and involves predation risk. We use theory to show that small larval fish with a high risk of predation should nevertheless forage intensely and maintain high growth rates. The implication of this is that food availability is more important to recruitment success than is often assumed from studies of growth rate, since the main effect of low food availability appears as increased predation rates. As larvae develop and grow bigger, they are expected to tailor their behaviour to balance food intake and predation risk, which makes it more probable that environmental fluctuations will cause growth differences. A theoretical framework including larval behaviour thus illustrates how several existing hypotheses, i.e. “bigger is better”, “stage duration”, and “growth-selective predation”, emphasize different aspects of larval success but can be understood more generally and coherently when interpreted in the light of behavioural trade-offs. This may lead to more consistent consideration of larval behaviour in biophysical models of fish recruitment.

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