Design and construction of an Electric Fish Finder

Crampton, William G. R.; Wells, Jonathan K.; Smyth, C. Piazzi; Walz, Steven A.

doi:10.1590/s1679-62252007000300022

Cited by 21 publications

(19 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fishes were sampled using a dip net under floating vegetation and an electric fish finder (Crampton et al, 2007). The specimens were fixed in the field in 10% formalin solution.…”

Section: Methodsmentioning

confidence: 99%

Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

2009

View full text Add to dashboard Cite

The reproductive biology of a population of the weakly electric fish Brachyhypopomus draco from southern Brazil is described. Information is provided on the establishment of the reproductive period in this species and its relations with environmental and feeding factors, as well as on the absolute and relative fecundities, spawning type, sex ratio and sexual dimorphism. The species exhibits a relatively long reproductive period, a relative fecundity of 0.173 oocytes per mg of female total weight, and fractional spawning. The sex ratio did not differ from 1:1 during all sampled months. Sexual dimorphism related to hypertrophy of the male's distal portion of caudal filament was observed and males grew to greater lengths than females. Male gonadosomatic index (GSI) was significantly related to water depth, oxygen saturation and temperature. Female GSI was significantly related to water depth and hepatosomatic index.Descreve-se a biologia reprodutiva de uma população do peixe elétrico Brachyhypopomus draco do sul do Brasil. São apresentadas informações a respeito do período reprodutivo estabelecido e suas relações com fatores ambientais e alimentares, bem como a fecundidade absoluta e relativa, tipo de desova, proporção sexual e dimorfismo sexual. A espécie apresentou um período reprodutivo relativamente longo, uma fecundidade relativa de 0,173 ovócitos por mg de peso total da fêmea e uma desova do tipo parcelada. A proporção sexual encontrada foi de 1:1 durante todos os meses amostrados. Dimorfismo sexual relacionado com a hipertrofia da porção distal do filamento caudal dos machos e com o tamanho total dos espécimes -machos atingindo tamanhos maiores do que as fêmeas -foi encontrado. O IGS dos machos foi significativamente relacionado com a profundidade da água, a saturação de oxigênio e a temperatura; o IGS das fêmeas foi significativamente relacionado com a profundidade da água e o índice hepatossomático.

show abstract

“…Fishes were sampled using a dip net under floating vegetation and an electric fish finder (Crampton et al, 2007). The specimens were fixed in the field in 10% formalin solution.…”

Section: Methodsmentioning

confidence: 99%

Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

2009

View full text Add to dashboard Cite

show abstract

“…are reported from this region. Probably the use of an electrical fish portable amplifier (Crampton et al 2007) was the reason for collecting a larger number of electric fish in our expedition. In addition, some species of other groups are for the first time referred for the Lower Urubamba region; Acestrocephalus boelkhei, Geryichthys sterbai, Leptagoniates steindachneri, Panaque changae, Farlowella kneri, Centromochlus perugiae, and Batrochoglanis raninus.…”

Section: Resultsmentioning

confidence: 99%

“…Collections were made using standard ichthyological gear, including seine nets (5 and 10 m, 5 mm between knots), dip nets, cast nets, and hook and line. Electric fishes were located with the aid of a portable amplifier (Crampton et al 2007).…”

Section: Methodsmentioning

confidence: 99%

Fishes from the Lower Urubamba river near Sepahua, Amazon Basin, Peru

Carvalho¹,

Espino²,

Maxime³

et al. 2011

View full text Add to dashboard Cite

We report results of an ichthyological survey of the Lower Urubamba river, a tributary of the Ucayali river located in the southwestern portion of the Amazon Basin in southeastern Peru. Collections were made at low water (July, 2009) from 280 - 310 m elevation, near the town of Sepahua within the Fitzcarrald Arch, an upland associated with Pliocene (c. 4 Ma) uplift of the Peruvian Andes. This is the second of four planned expeditions to the region with the goal of comparing ichthyofaunas across the headwaters of the largest tributary basins in the western Amazon (Juruá, Ucayali, Purús and Madre de Dios). Twenty-one sites were sampled using seine nets, hook lines, cast nets and dip nets. A total of 98 species in 22 families and eight orders were captured and identified. The most diverse families are Characidae (40 spp.) and Loricariidae (20 spp.), and 12 families are represented by a single species. These data suggest that the fish fauna of the Lower Urubamba river near Sepahua is distinct from, and less diverse than, adjacent areas of lowland Amazonia.

show abstract

“…We collected 45 adult individuals (36 females and nine males) of Gymnorhamphichthys rondoni using an electric fish detector (Crampton et al 2007) and hand nets in a terra firme forest stream at Fazenda Dimona of the Biological Dynamics of Forest Fragments Project (BDFFP -http://pdbff.inpa.gov.br/), located about 80 km north of Manaus, Amazonas state, Brazil. The studied forest stream is a tributary of the Cuieiras River in the Negro River basin, in the central Brazilian Amazon.…”

Section: Methodsmentioning

confidence: 99%

Sexual dimorphism in the electric knifefish, Gymnorhamphichthys rondoni (Rhamphichthyidae: Gymnotiformes)

Garcia

Zuanon

2019

Acta Amaz.

View full text Add to dashboard Cite

Sexual dimorfism refers to morphological differences between males and females of a species. It may be a result of different selection pressures acting on either or both sexes and may occur in any sexually-reproducing dioecious species, including fishes. We analyzed 63 females and 63 adult males of Gymnorhamphichthys rondoni (Gymnotiformes) collected by us or deposited in museum collections. Sex was identified through abdominal dissection. We measured length from snout to posterior end of anal-fin, anal-fin length, distance from anus to anal-fin origin, distance from genital papilla to anal-fin origin, body width at beginning of anal-fin, and head length. Morphometric data submitted to a Principal Component Analysis (PCA) grouped males and females according to variables related to body size (along the first component) and to head length and body height along the second and third components. Females were larger than males, whereas males had proportionally larger heads and higher bodies than females. The urogenital papilla of males and females showed differences in shape, size and relative position on the body. The female papilla was elongated horizontally, larger than that of males, and was located on a vertical line below the eye, while the papilla of the males was vertically elongated and located on a vertical line below the operculum. To our knowledge, this is the first recorded case of sexual dimorphism in a species of Rhamphichthyidae, a condition that is now known in all the currently recognized families of Gymnotiformes.

show abstract

Design and construction of an Electric Fish Finder

Cited by 21 publications

References 1 publication

Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

Fishes from the Lower Urubamba river near Sepahua, Amazon Basin, Peru

Sexual dimorphism in the electric knifefish, Gymnorhamphichthys rondoni (Rhamphichthyidae: Gymnotiformes)

Contact Info

Product

Resources

About