Caracteres merísticos e biologia do cascudo, Hypostomus fluviatilis (Schubart, 1964) (Osteichthyes, Loricariidae) do rio Mogi-Guaçu, São Paulo, Brasil

Nomura, Hitoshi

doi:10.1590/s0101-81751988000100006

Cited by 3 publications

(6 citation statements)

References 2 publications

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“…2021). Our work supports the pattern of larger body size in males for congeneric H. hermanni documented by Nomura and Mueller (1980) as well as the >100‐year‐old report by Miranda Ribeiro (1918) of enlarged fins in males of H. albopunctatus (Zawadzki et al. 2020).…”

Section: Discussionsupporting

confidence: 91%

“…Dimorphism within the genus Hypostomus is apparently uncommon given that studies have concluded a lack of sexual dimorphism for H. commersonii (Goulart and Verani 1992), H. affins and H. luetkeni (Mazzoni and Caramaschi 1995), H. velhochico (Zawadzki et al 2017), H. subcarinatus (Zawadzki et al 2019), and H. froehlichi (Zawadzki et al 2021). Our work supports the pattern of larger body size in males for congeneric H. hermanni documented by Nomura and Mueller (1980) as well as the >100-year-old report by Miranda Ribeiro (1918) of enlarged fins in males of H. albopunctatus (Zawadzki et al 2020). Differences in total body size may cause other morphometrics to increase in size due solely to correlation with total size; thus, it is common to calculate ratios of morphometric measures to total or standard length as we did in our study (Reis et al 2022).…”

Section: Discussionsupporting

confidence: 84%

“…Though the diversity of Loricariidae is high and some genera express multiple sexually dimorphic characteristics simultaneously (e.g., Pereira et al 2014), Rapp Py-Daniel and Fernandes (2005) included only one example of sexual dimorphism for Hypostomus. This example was that of larger body sizes among males for H. hermanni, as documented by Nomura and Mueller (1980). Dimorphism within the genus Hypostomus is apparently uncommon given that studies have concluded a lack of sexual dimorphism for H. commersonii (Goulart and Verani 1992), H. affins and H. luetkeni (Mazzoni and Caramaschi 1995), H. velhochico (Zawadzki et al 2017), H. subcarinatus (Zawadzki et al 2019), and H. froehlichi (Zawadzki et al 2021).…”

Section: Discussionmentioning

confidence: 95%

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Sexual dimorphism in an invasive population of suckermouth armored catfish: Implications for management

Arend,

Mangold,

Riggins

et al. 2023

N American J Fish Manag

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Suckermouth armored catfishes (SACs; Loricariidae) have invaded waterbodies outside their native range globally. Population control methods, including removals and genetic biocontrols, may be enhanced through greater knowledge of sex discrimination, sex ratios, and potential sex bias among control methods. We investigated sexual dimorphism and population sex ratio for an invasive SAC population of Hypostomus sp. in the upper San Marcos River, Texas, USA as a means of advancing on‐going management of the population. Among 385 specimens obtained at random during a planned dewatering of a 100‐m reach of the river, the sex ratio was biased towards females (proportion of females = 0.60). Morphometric analyses of 105 females and 108 males based on a generalized boosted classification model (GBM) revealed elongated dorsal‐ and anal‐fins in males correctly classified sex for 83% of individuals (95% CI = 77–88%). Seven independent observers used results from the GBM to assign sex to 30 fish with average accuracy of 72% (range = 43–83%). Accuracy of the model and validation exercises was highest for fish >240 mm total length, the estimated length of reproductive maturity. Morphometrics based on dorsal‐ and anal‐fin sizes can be used to infer sex externally from hundreds of SACs removed per year to evaluate long‐term population management success.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

Sexual dimorphism in an invasive population of suckermouth armored catfish: Implications for management

Arend,

Mangold,

Riggins

et al. 2023

N American J Fish Manag

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“…debemos tener presente que las especies de Curimatidae se caracterizan por un órgano epibranquial musculoso, en la parte media de la porción dorsal de los arcos branquiales, con una reducción o pérdida de dentición en la V placa faríngea y en los ceratobranquiales, y las mandíbulas en los adultos no poseen dientes (Vari, 1989b;Nelson, 2006). Esta caracterización morfológica las capacita para ser especies detritívoras (Froese & Pauly, 2013), que se alimentan específicamente de materia orgáni-ca floculada, microdetritus, micro vegetación, algas filamentosas y microcrustáceos (Nomura & Taveira, 1979;Nomura & Hayashi, 1980;Carvalho, 1984;Vari, 1989b;Vari, 1989c;Fernández, Pouilly, & Reja, 2011). La disponibilidad de estos alimentos sería una de las variables que podría estar induciendo estas diferencias, donde las especies que habitan ambientes lóticos tienden a ser euritróficas, con un gran consumo de material alóctono, aprovechando todo lo disponible (Escalante, 1987), lo que las constituye en especies oportunistas.…”

Section: Discussionunclassified

Biological parameters of Pseudocurimata boulengeri (Characiformes: Curimatidae) inhabiting the Chongón dam, Ecuador

Chicaiza¹,

Flores²

2016

RBT

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Biological parameters of Pseudocurimata boulengeri (Characiformes: Curimatidae) inhabiting the Chongón dam, Ecuador. Pseudocurimata boulengeri is an endemic species of Ecuador, which sustains a large group of fisher families. The biological data of this species correspond to reports from lotic systems of Los Ríos province; nevertheless, their trend in a lentic system is not yet known. This paper describes the sex ratio, length-weight relationship, gonad development, spawning season and size at reproductive maturity of P. boulengeri, inhabiting the lentic system of Chongón dam, Ecuador. Fish were caught between 2003 and 2009 using gill nets (2.5"). The total length (Lt) of caught specimens ranged from 10.5 to 35.5 cm, spawning occurred between the months of October and March, and size at first maturity for females was estimated at 17.9 cm (Lt) and 20.0 cm (Lt) for males. Between May and October male and female ratios were as expected (1:1), whereas for May, November and April, females ratios were higher than males, situation that coincided with the spawning season. The limnetic conditions and high production characteristics of Chongón dam, have promoted the availability of a great amount of food for this species, which may have allowed P. boulengeri to have a more extended reproductive season in this favorable environment. Rev. Biol. Trop. 64 (1): 131-146. Epub 2016 March 01.

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“…Both Iheringichthys labrosus (Lütken, 1874) and Pimelodus maculatus Lacépède, 1803 can be found among the native species of the Grande River. They belong to the order Siluriformes, family Pimelodidae, have common anatomical characteristics described by Lundberg & Littmann (2003) that are generally associated with benthic foraging habits (Nomura et al 1972, Fugi et al 1996, Abes et al 2001, Fugi et al 2001. I. labrosus has been classified as omnivorous, invertivorous or insectivorous species (Manetta et al 2003, Luz-Agostinho et al 2006, Fagundes et al 2008, Ribeiro et al 2014) and there is little information on its interaction with other species (Masdeu et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Diet and resource sharing by two Pimelodidae species in a Southeastern Brazilian reservoir

et al. 2019

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Fish can vary their diet and feeding dynamics according to biotic and abiotic factors. There is insufficient knowledge regarding these factors in reservoirs, which limits the management of these areas. The aim of this study was to determine the diet of two related and most collected fish species, verify the influence of biotic and abiotic factors on their diet, and also verify the existence of resource sharing by them in an upstream Brazilian reservoir. Fish abundance in the reservoir was calculated and data were provided by 176 specimens of Iheringichthys labrosus (Lütken, 1874) and 255 specimens of Pimelodus maculatus Lacépède, 1803 collected in Camargos reservoir, MG, Brazil. Stomach contents were analysed through the frequency of occurrence and volumetric methods. PERMANOVA analysis was done to evaluate the influence of biotic (Species and Size class) and abiotic factors (Season and Site) on the diets. The Alimentary Index (AI) and feeding overlap Index (Pianka) were also estimated. A NMDS analysis was conducted to visualize the food categories responsible for interspecific difference. The ingested items were grouped into 18 categories, of which 17 were found in both species. Feeding resources were significantly related to the biotic (Species: Pseudo F = 2.583, P = 0.001; Size Class: Pseudo F = 1.646, P = 0.001) and abiotic (Season: Pseudo F = 2.458, P = 0.006) factors. I. labrosus showed an invertivorous diet while P. maculatus an omnivorous diet and both species were not exclusively benthophagus as typically reported. Food overlap occurred intraspecifically and interspecifically (Pianka 0.61 to 0.97 and 0.61 to 0.66, respectively) and overlap also occurred in three of the four analysed seasons (Pianka 0.66 to 0.91). The diet overlap found between two of the most fished species and the low fish productivity may indicate the limitation of resources in this reservoir and should be considered for management of this area.

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Caracteres merísticos e biologia do cascudo, Hypostomus fluviatilis (Schubart, 1964) (Osteichthyes, Loricariidae) do rio Mogi-Guaçu, São Paulo, Brasil

Cited by 3 publications

References 2 publications

Sexual dimorphism in an invasive population of suckermouth armored catfish: Implications for management

Sexual dimorphism in an invasive population of suckermouth armored catfish: Implications for management

Biological parameters of Pseudocurimata boulengeri (Characiformes: Curimatidae) inhabiting the Chongón dam, Ecuador

Diet and resource sharing by two Pimelodidae species in a Southeastern Brazilian reservoir

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