Length-weight relationships of four small fish species caught in the Heishui River, China

2016 ◽  
Vol 32 (2) ◽  
pp. 397-398 ◽  
Author(s):  
C. Wang ◽  
Y. Q. Liang ◽  
D.-M. Huang ◽  
M. Li
Keyword(s):  
Fish Species ◽  
Small Fish

scholarly journals Use of food resources by small fish species in Neotropical rivers: responses to spatial and temporal variations

2014 ◽  
Vol 31 (5) ◽  
pp. 435-444 ◽  
Author(s):  
Jislaine Cristina da Silva ◽  
Éder André Gubiani ◽  
Rosilene Luciana Delariva
Keyword(s):  
Fish Species ◽  
Temporal Variations ◽  
Food Resources ◽  
Spatial And Temporal Variations ◽  
Small Fish

scholarly journals Nest-site selection in a fish species with paternal care

Hydrobiologia ◽  
2020 ◽  
Author(s):  
Theo C. M. Bakker ◽  
Beat Mundwiler
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Oxygen Concentration ◽  
Fish Species ◽  
Nest Site ◽  
Paternal Care ◽  
Small Fish ◽  
Dissolved Oxygen Concentration ◽  
Nest Sites ◽  
Higher Temperature

AbstractFish that perform paternal care may increase their fitness by choosing nest sites that enhance survival and development of embryos. We studied nest-site choice with respect to dissolved oxygen concentration and water temperature in males of the three-spined stickleback (Gasterosteus aculeatus), a small fish species with exclusive male parental care that usually breeds in the littoral zone of freshwaters of the Northern hemisphere. Fathers oxygenate the embryos by fanning movements of their pectoral fins. We expected choice for conditions at potential nest sites that would benefit offspring development, i.e., higher temperature and higher dissolved oxygen concentration. In the laboratory, we offered males a choice between two potential nest sites that differed in dissolved oxygen concentration or water temperature. Males preferred to build a nest at sites with a higher dissolved oxygen level or higher temperature and thus chose sites that would promote embryo development.

scholarly journals Size Frequency Distribution, Length-length and Weight-length Relationships and Condition Factor of Eight Fish Species of Nkam River, Coastal Cameroon

2020 ◽  
pp. 1-12
Author(s):  
Claudine Tekounegning Tiogué ◽  
Evrard Kouopestchop Medjo ◽  
Franklin David Ndilock Makongo
Keyword(s):  
Frequency Distribution ◽  
Fish Species ◽  
Condition Factor ◽  
Coastal Region ◽  
Small Fish ◽  
Size Frequency Distribution ◽  
Size Frequency ◽  
Length Relationship ◽  
Growth Performances ◽  
Sarotherodon Galilaeus

Aims: To assess the aquaculture potential of endogenous species in their habitat for domestication and preservation. Study Design: Growth performances of fish caught was analyzed by family, species, sex and month. Place and Duration: This study was conducted from April 12 to June 28, 2016 at CREVS (Cameroon Reptiles and Ecosystems Valorization Society) located in the District of Yabassi, Department of Nkam, Coastal Region of Cameroon. Methodology: A total of 160 fishes were collected by quantitative sampling for 3 months in the Nkam River. Results: It appears that two families of fish were recorded: the Cyprinidae (Labeo sanagaensis) and the Cichlidae (Tilapia cameronensis, Sarotherodon galilaeus sanagaensis, Sarotherodon nigripinnis dolloi, Tylochromis sudanensis, Hemichromis elongatus, Tylochromis trewavasae and Chromidotilapia gutheri gutheri). L. sanagaensis recorded the highest relative abundance (30%) against 3.13% (C. gutheri gutheri). Large fish were recorded in the majority of species in males, except in T. trewavasae and H. elongatus. The average total length was 23.71 ± 8.31 cm and the average total weight was 266.11 ± 200.96 g. Size frequency distribution of fish was bimodal with a large mode at size 20 cm and a small at size 36 cm. Small fish were abundant in catches especially in S. nigripinnis dolloi and C. gutheri gutheri. The allometric coefficient b of the weight-length relationship averaged 3.01 ± 0.87. The fish presented three types of growth: isometric, positive and negative allometric, and the condition factor K was greater than 1. Conclusion: It was concluded that these fish species could in general be potential candidates for domestication.

scholarly journals Changes in diet and niche breadth of a small fish species in response to the flood pulse in a Neotropical floodplain lake

Limnologica ◽  
2017 ◽  
Vol 62 ◽  
pp. 126-131 ◽  
Author(s):  
Bárbara Angélio Quirino ◽  
Natalia Carniatto ◽  
Renata Guglielmetti ◽  
Rosemara Fugi
Keyword(s):  
Fish Species ◽  
Niche Breadth ◽  
Flood Pulse ◽  
Small Fish ◽  
Floodplain Lake ◽  
Neotropical Floodplain

Ultrastructural analysis of hepatic carcinogenesis in two small fish species

1986 ◽  
Vol 44 ◽  
pp. 124-125
Author(s):  
William E. Hawkins ◽  
Robin M. Overstreet ◽  
William W. Walker
Keyword(s):  
Fish Species ◽  
Osmium Tetroxide ◽  
Poecilia Reticulata ◽  
Small Fish ◽  
Hepatic Carcinogenesis ◽  
Direct Acting ◽  
Environmental Carcinogenesis ◽  
Routine Procedures ◽  
Carcinogenesis Models ◽  
King Cobra

Small fish species are potentially good environmental carcinogenesis models because they are sensitive to several types of carcinogens, develop tumors rapidly, and are economical to breed and maintain. To gain a better understanding of the origin and progression of neoplastic lesions, we exposed 6-10-day-old specimens of seven small fish species to the direct-acting carcinogen methylazoxymethanol acetate (MAM-Ac) and all seven developed hepatic neoplasms. We examined livers of two species, Japanese medaka (Oryzias latipes) and king cobra guppy (Poecilia reticulata), by electron microscopy at various intervals after MAM-Ac exposure. Livers were processed by routine procedures. Tissues were minced, fixed by immersion in 3% phosphate-buffered glutaraldehyde, rinsed in buffer, postfixed in 1% phosphate-buffered osmium tetroxide, and processed into Embed 812.

DNA MICROARRAY APPLICATION IN ECOTOXICOLOGY: EXPERIMENTAL DESIGN, MICROARRAY SCANNING, AND FACTORS IMPACTING TRANSCRIPTIONAL PROFILES IN A SMALL FISH SPECIES

2007 ◽  
Vol preprint (2007) ◽  
pp. 1
Author(s):  
Rong-Lin Wang ◽  
Adam Biales ◽  
David Bencic ◽  
David Lattier ◽  
Mitch Kostich ◽  
...  
Keyword(s):  
Experimental Design ◽  
Dna Microarray ◽  
Fish Species ◽  
Small Fish ◽  
Transcriptional Profiles

Evidence of population resistance to extreme low flows in a fluvial-dependent fish species

2015 ◽  
Vol 72 (11) ◽  
pp. 1776-1787 ◽  
Author(s):  
Rachel A. Katz ◽  
Mary C. Freeman
Keyword(s):  
Fish Species ◽  
Survival Rates ◽  
Low Flow ◽  
Small Fish ◽  
Severe Drought ◽  
High Survival ◽  
Opposite Pattern ◽  
Flow Variability ◽  
Low Flows ◽  
Local Survival

Extreme low streamflows are natural disturbances to aquatic populations. Species in naturally intermittent streams display adaptations that enhance persistence during extreme events; however, the fate of populations in perennial streams during unprecedented low-flow periods is not well-understood. Biota requiring swift-flowing habitats may be especially vulnerable to flow reductions. We estimated the abundance and local survival of a native fluvial-dependent fish species (Etheostoma inscriptum) across 5 years encompassing historic low flows in a sixth-order southeastern USA perennial river. Based on capture–mark–recapture data, the study shoal may have acted as a refuge during severe drought, with increased young-of-the-year (YOY) recruitment and occasionally high adult immigration. Contrary to expectations, summer and autumn survival rates (30 days) were not strongly depressed during low-flow periods, despite 25%–80% reductions in monthly discharge. Instead, YOY survival increased with lower minimum discharge and in response to small rain events that increased low-flow variability. Age-1+ fish showed the opposite pattern, with survival decreasing in response to increasing low-flow variability. Results from this population dynamics study of a small fish in a perennial river suggest that fluvial-dependent species can be resistant to extreme flow reductions through enhanced YOY recruitment and high survival.

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