Effects of prey density and short term food deprivation on the growth and survival of American shad larvae

Johnson, James H.; Dropkin, David S.

doi:10.1111/j.1095-8649.1995.tb01610.x

Cited by 23 publications

(22 citation statements)

References 22 publications

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“…Some of the remaining mortality taking place during the next 2 weeks was size-selective, and may have been due to the loss of larvae that had been only partly successful in their start feeding. Such a delay of starvation related mortality in slow growing populations has been observed in herring (Werner & Blaxter, 1980), cod Gudus morhuu L., and shad Alosu supidissima Wilson (Otter&, 1993;Johnson & Dropkin, 1995).…”

Section: Discussionmentioning

confidence: 83%

Early life history of herring larvae in contrasting feeding environments determined by otolith microstructure analysis

Folkvord

Rukan

Johannessen

et al. 1997

Journal of Fish Biology

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Newly hatched autumn-spawned herring larvae Clupeu lzurengus were released in two 2500-m' outdoor mesocosms and reared over a 2-month period. Hydrographic conditions were similar in the two mesocosms, but the average plankton density was initially more than 10 times higher in mesocosm B compared to mesocosm A (>1 1Half-way through the experiment the feeding conditions reversed with three times higher average densities in mesocosm A than in mesocosm B ( > 3 1 ~ ' v. -1 1 ~ '). Herring larvae were sampled with a 0.3-m2 two-chambered net twice weekly, and survivors were harvested by draining the mesocosms at the end of the experiment. Otolith growth trajectories of individual larvae were determined by relating radial otolith size with number of increments from the outer edge of the otolith (days before capture). The increment widths during the first 3 weeks after hatching, including the first-check size, were generally wider among larvae from mesocosm B (relatively good initial feeding conditions) than among those from mesocosm A (poor initial feeding conditions). The otolith growth pattern also confirmed that the surviving herring in mesocosm A belonged to the upper size range of larvae in the mesocosm after only 2-3 weeks from hatching; no such trend was found in mesocosm B. In both mesocosrns the otolith size-at-age indicated that with the present sampling gear, herring larvae larger than 20--25 mm were underrepresented in the net samples. The information obtained from otolith-size-at-age is compared with other morphometric and biochemical measures of size and condition of larvae v. 10.1 1 ~ I ) .obtained throughout the experiment.(c) 1997 The Fisheries Society of the British lsles

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Section: Discussionmentioning

confidence: 83%

Early life history of herring larvae in contrasting feeding environments determined by otolith microstructure analysis

Folkvord

Rukan

Johannessen

et al. 1997

Journal of Fish Biology

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“…SIMPER also allows for the identification of TABLE 2. Prey and American shad stocking densities from Johnson and Dropkin (1995) and Riley et al (2012). The stocking densities given on a per-liter basis represent the values used in the experiments.…”

Section: Methodsmentioning

confidence: 99%

Foraging Potential of Larval Alosines in the Lower Roanoke River and Albemarle Sound, North Carolina

2012

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Zooplankton composition and abundances were quantified in the lower Roanoke River and Albemarle Sound, North Carolina. The spatial and temporal overlap between larval alosines, including American shad Alosa sapidissima, river herring (alewife A. pseudoharengus and blueback herring A. aestivalis), hickory shad A. mediocris, and zooplankton were examined to determine whether larval alosines in this system are food limited. Samples were collected weekly at 19 stations from March through June 2008–2009 in three habitats: River, Delta, and Sound. Spatial differences in zooplankton were observed, with the abundance in the Sound (16,546 ± 14,678 [number/m3 ± SD]) being significantly higher than those in the River (4,934 ± 3,806) and Delta areas (4,647 ± 2,846). Zooplankton composition was dominated by Daphniidae, Bosminidae, calanoid and cyclopoid copepods, copepod nauplii, and rotifers. The spatial patterns in alosine abundance were the opposite of those for zooplankton, being highest in the River (21.0 ± 127.6) and lower in the Delta (7.5 ± 35.5) and Sound (4.6 ± 24.8). Mouth gape models for each alosine species showed that copepod nauplii and rotifers are the most suitable‐sized prey for the first feeding after yolk sac absorption. There was a high degree of spatial and temporal overlap between larval alosines and size‐appropriate prey items, suggesting that the larval alosines are not food limited in Albemarle Sound. Received March 25, 2011; accepted January 24, 2012

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“…Fish growth performance among treatments were evaluated with the following parameters: specific growth rate (SRG) (Johnson and Dropkin, 1995), calculated as: SGR = (eg-1) X 100, where g = (ln W2 -ln W1) x (T2 -T1) -1; W2 and W1 are weights (g) on days t2 and t1, respectively (Houde and Schekter, 1981) and coefficient of variation (CV) of weight were then calculated (Jobling, 1994). Data are expressed as means ± SE and were analyzed by one-way ANOVA.…”

mentioning

confidence: 99%

Tambaqui growth and survival when exposed to different photoperiods

et al. 2006

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The use of different photoperiods (light) were investigated during tambaqui (Colossoma macropomum) juvenile growth under captivity. Light intensity tested was: continuous dark (24hrs without light), natural photoperiod simulation (10hrs of light and 14hrs without light) and continuous light (24 with light). No mortality was recorded among treatments. Significant differences was observed after 50 days of experiment among mean fish weight, fish kept under a continuous darkness showed a better specific growth rate (6.02%) when compared to control fish (natural photo period, 3.67%). Fish exposed to continuous light presented the lowest mean specific growth rate (2.04%). It is possible to improve tambaqui juvenile weight gain performance when kept under continuous darkness. KEY-WORDSColossoma macropomum, juvenile fish, photoperiod, growth. Crescimento e sobrevivência do tambaqui exposto a diferentes fotoperíodos RESUMO Investigou-se o uso de diferentes fotos períodos (iluminação) durante o crescimento de juvenis de tambaqui (Colossoma

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Effects of prey density and short term food deprivation on the growth and survival of American shad larvae

Cited by 23 publications

References 22 publications

Early life history of herring larvae in contrasting feeding environments determined by otolith microstructure analysis

Early life history of herring larvae in contrasting feeding environments determined by otolith microstructure analysis

Foraging Potential of Larval Alosines in the Lower Roanoke River and Albemarle Sound, North Carolina

Tambaqui growth and survival when exposed to different photoperiods

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