Seasonal variations in RNA–DNA ratios and in indicators of feeding, reproduction, energy storage, and condition in a population of bluegill, <i>Lepomis macrochirus</i> Rafinesque

Bulow, Frank J.; Zeman, Michal; Winningham, James R.; Hudson, W. F.

doi:10.1111/j.1095-8649.1981.tb03766.x

Cited by 65 publications

(30 citation statements)

References 22 publications

(29 reference statements)

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“…Consequently, RNA and the ratio ofRNA to DNA are useful as an index of growth. In the present study, RNA-DNA ratios in rohu spawn were positively correlated to the trends in growth as has been indicated by several authors (Bulow 1970(Bulow , 1971Haines 1973Haines , 1980Bulow et al 1981). Wilder and Stanley (1983) confirmed the relationship be tween growth and RNA-DNA ratios in brook trout, Salvelinus fontinalis and Atlantic salmon, Salmo salar.…”

Section: Discussionsupporting

confidence: 74%

Growth and survival of rohu, Labeo rohita (Hamilton) spawn fed diets supplemented with fish intestinal microflora

Ghosh¹,

Sen²,

Ray³

2002

Acta Ichthyol. Piscat.

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A 21-day feeding experiment was conducted to assess the effects of diets supplemented with fish intestinal bacteria producing extracellular enzyme on growth and survival of rohu, Labeo rohita (Hamilton) spawn (average weight 0.3 mg). Intestinal bacteria were isolated from healthy rohu fingerlings s averag � w � ight 3.51 _ ±0.31 _ g). Six isocaloric (4.24 kcal·g-) and 1somtrogenous \approximately 35% crude protein) diets (Dl-D6) were prepared containing 32% fish meal, 34% mustard oil cake, 30% rice bran, 2o/o cod liver oil, and 2% vitamin premix. Experimental diets (D2-D6) were supplemented with the isolated bacterial strain Bacillus circu lans Lr 1

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Section: Discussionsupporting

confidence: 74%

Growth and survival of rohu, Labeo rohita (Hamilton) spawn fed diets supplemented with fish intestinal microflora

Ghosh¹,

Sen²,

Ray³

2002

Acta Ichthyol. Piscat.

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“…Bluegill are known to consume moderate quantities of benthic invertebrates in the winter (Bulow et al 1981) and have the potential to deplete local abundance of chironomids and alter benthic community structure (Gilinski 1984). Fathead minnows also consume invertebrates (Ludwig 1996), but usually focus on zooplankton (Hambright & Hall 1992) that are only present in low quantities during winter.…”

Section: Discussionmentioning

confidence: 99%

“…At cool temperatures, largemouth bass foraging efficiency and encounter rates decrease as they exhibit reduced activity and swimming performance. Both bluegill (Bulow et al 1981) and fathead minnows (Klinger et al 1982) are generally believed to exhibit similar low levels of winter activity. Thus, the largemouth bass in ponds with bluegill and fathead minnows may have expended substantial energy unsuccessfully attempting to capture piscine prey, leading to their more variable weight in the spring.…”

Section: Discussionmentioning

confidence: 99%

The energetic impact of overwinter prey assemblages on age-0 largemouth bass, Micropterus salmoides

Ostrand¹,

Cooke

Garvey

et al. 2005

Environ Biol Fish

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SynopsisWe compared survival, growth, and swimming performance of two size classes of age-0 largemouth bass, Micropterus salmoides, in the spring after being fed diets of bluegill, Lepomis macrochirus, fathead minnows, Pimephales promelas, or invertebrate prey during the winter. Regardless of prey assemblage, survival was uniformly high and independent of size. Length, wet-and dry-mass, and condition was also similar among treatments for both size classes. However, variation in individual performance differed, with the lowest variability in growth occurring among small age-0 largemouth bass in the invertebrate only treatment. Absolute and length corrected swimming speeds of largemouth bass were highest for invertebrate prey assemblages, intermediate for fathead minnow prey, and lowest for bluegill prey. The patterns in growth and spring swimming performance likely reflect the varied nutritive quality of different prey, the ability of largemouth bass to capture different prey, and competition with the piscine prey.

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“…Fish condition, defined as the robustness or wellbeing of an individual fish (Le Cren 1951;Bulow et al 1981;Blackwell et al 2000), is an essential component of fishery biology used to assess the general health of populations (Gulland 1983;Sparre et al 1989). Condition can vary dramatically both within and among populations; and it is therefore critical to identify environmental predictors of this variation to optimize fishery production.…”

Section: Introductionmentioning

confidence: 99%

Fish condition in introduced tilapias of Ugandan crater lakes in relation to deforestation and fishing pressure

2009

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This study identifies environmental predictors of the condition of two introduced tilapia species (Oreochromis leucostictus and Tilapia zillii) that are known to have divergent trophic niches (planktivore and herbivore, respectively) in 17 crater lakes in western Uganda. We asked whether fish condition differs among lakes characterized by differences in fishing pressure and catchment deforestation; and we related relative condition factor to gradients of environmental variation across lakes. Lakes characterized by severe catchment deforestation tended to be lakes with high fishing pressure, so it was difficult to explore independent and interactive effects. However, mean relative condition factor was higher in populations with high fishing pressure compared to populations with low fishing pressure for both O. leucostictus and T. zillii. The condition of O. leucostictus populations was higher in lakes with severely deforested catchments; but mean relative condition factor of T. zillii did not differ between deforestation categories. Principal components analysis (PCA) was used to describe the major environmental gradients of variation among the lakes; and PCA factor scores were regressed against relative fish condition. The association between fish condition and environmental gradients was stronger for O. leucostictus than for T. zillii. For O. leucostictus, fish condition was related to PC1 (43% of the variance) and factors that loaded most heavily included Chl-a, water transparency, lake area and depth, suggesting higher condition in lakes characterized by higher primary productivity and smaller size. For T. zillii, PC3 (11%) was the only axis related to fish condition; and factors that loaded most heavily included lake area (positive), and conductivity and total nitrogen (negative). Some of the larger lakes are characterized by higher availability of macrophytes that may positively affect the food base for T. zillii.

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Seasonal variations in RNA–DNA ratios and in indicators of feeding, reproduction, energy storage, and condition in a population of bluegill, Lepomis macrochirus Rafinesque

Cited by 65 publications

References 22 publications

Growth and survival of rohu, Labeo rohita (Hamilton) spawn fed diets supplemented with fish intestinal microflora

Growth and survival of rohu, Labeo rohita (Hamilton) spawn fed diets supplemented with fish intestinal microflora

The energetic impact of overwinter prey assemblages on age-0 largemouth bass, Micropterus salmoides

Fish condition in introduced tilapias of Ugandan crater lakes in relation to deforestation and fishing pressure

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