scholarly journals Reproductive biology of the skates Sympterygia acuta Garman, 1877 and S. bonapartii Müller & Henle, 1841 (Chondrichthyes: Rajoidei) in south Brazil

2014 ◽  
Vol 12 (4) ◽  
pp. 771-782 ◽  
Author(s):  
Alexander Basallo ◽  
Maria Cristina Oddone
Keyword(s):  
Sexual Development ◽  
Brazilian Coast ◽  
Commercial Fishing ◽  
Size At Maturity ◽  
Southern Coast ◽  
Western Atlantic ◽  
Total Length ◽  
Disc Width ◽  
Males And Females ◽  
South Brazil

The present study analyzed the sexual development, sizes at maturity and morphometric relationships for both sexes of Sympterygia acutaand S. bonapartii, endemic of south-western Atlantic Ocean. The examined specimens were obtained through research cruises and commercial fishing trips, during 2011 and 2012, along the southern Brazilian coast, in latitudes ranging from 34°28'S to 31°29'S and at depths between 15 and 142 m. Significant differences (p<0.05) in S. bonapartii and in S acutabetween sexes for the relationships total length (cm) - disc width (cm) and total length - total/eviscerated weight (g) respectively, demonstrated sexual dimorphism during the development in both species. The estimated size at maturity for males and females, respectively, were 46.1 and 44.7 cm, for S. acuta, and 58.4 and 59.9 cm, for S. bonapartii. A decrease in size at maturity for both sexes was observed in S. acuta and females of S. bonapartii of the southern coast of Brazil, respect to previous studies carried out over the last 30 years.

scholarly journals Reproductive biology of the Brazilian sharpnose shark (Rhizoprionodon lalandii) from southeastern Brazil

2007 ◽  
Vol 64 (9) ◽  
pp. 1829-1835 ◽  
Author(s):  
Fabio S. Motta ◽  
Rafael C. Namora ◽  
Otto B. F. Gadig ◽  
F. M. S. Braga
Keyword(s):  
Reproductive Biology ◽  
Positive Relationship ◽  
Ovarian Follicles ◽  
Southeastern Brazil ◽  
Brazilian Coast ◽  
Marine Science ◽  
Size At Maturity ◽  
Total Length ◽  
Males And Females ◽  
Using Data

Abstract Motta, F. S., Namora, R. C., Gadig, O. B. F., and Braga, F. M. S. 2007. Reproductive biology of the Brazilian sharpnose shark (Rhizoprionodon lalandii) from southeastern Brazil. – ICES Journal of Marine Science, 64: 1829–1835. The reproductive biology of the Brazilian sharpnose shark, Rhizoprionodon lalandii, off southeastern Brazil was investigated using data from gillnet landings. The size-at-maturity for males and females was estimated to be 59 and 62 cm total length (LT), respectively. Ovarian fecundity ranged from 3 to 7 follicles (mean = 4.54), and uterine fecundity from 1 to 5 embryos (mean = 3.3). There was a slight positive relationship between female LT and the number of ovarian follicles, but uterine fecundity was not related to female LT. Embryonic growth is fast following fertilization during summer and autumn. Gestation requires 11–12 months, and peak parturition is between August and September. A comparison of size-at-maturity between animals from northeastern and southeastern Brazil suggests the existence of at least two stocks of R. lalandii along the Brazilian coast.

scholarly journals Aspects of the reproductive biology of skates (Chondrichthyes: Rajiformes: Rajoidei) from southern Africa

2007 ◽  
Vol 65 (1) ◽  
pp. 81-102 ◽  
Author(s):  
David A. Ebert ◽  
Leonard J. V. Compagno ◽  
Paul D. Cowley
Keyword(s):  
Reproductive Biology ◽  
Southern Africa ◽  
Sexual Maturity ◽  
Size At Maturity ◽  
Total Length ◽  
Large Size ◽  
Disc Width ◽  
New Information ◽  
Males And Females ◽  
First Maturity

AbstractEbert, D. A., Compagno, L. J. V., and Cowley, P. D. 2008. Aspects of the reproductive biology of skates (Chondrichthyes: Rajiformes: Rajoidei) from southern Africa. – ICES Journal of Marine Science, 65: 81–102. New information is presented on the reproductive biology of 22 southern African skate species. Sex ratios for most species were relatively even. Sexual dimorphic differences in disc shape were evident in all species, but the total length (LT) to disc width (D) relationship was significantly different in only three species, and the LT to weight (W) relationship significant in just five species. Sexual dimorphism relative to maximum total length (LTmax) was absent in all but the two largest species. Males and females of the same species grow to a similar LTmax except those whose LTmax is >1.5 m LT. Size at first and 50% (LT50) sexual maturity was approximately the same for both sexes in all but the two largest species. First maturity occurred at >60% of LTmax for all species for which sufficient data were available, and most (n = 18) matured at >75% LTmax. The large size at maturity relative to LTmax suggests that growth slows or is partially suspended following sexual maturity. The egg cases of 15 species are described, and a key to their identification is presented. Egg cases in utero were observed throughout the year suggesting that most species reproduce year-round.

Population biology of Callinectes danae and Callinectes sapidus (Crustacea: Brachyura: Portunidae) in the south-western Atlantic

2009 ◽  
Vol 89 (7) ◽  
pp. 1341-1351 ◽  
Author(s):  
Mário José Pereira ◽  
Joaquim Olinto Branco ◽  
Martin Lindsey Christoffersen ◽  
Felipe Freitas ◽  
Hélio Augusto Alves Fracasso ◽  
...  
Keyword(s):  
Population Biology ◽  
Callinectes Sapidus ◽  
Relative Equilibrium ◽  
Carapace Width ◽  
Fishing Effort ◽  
Brazilian Coast ◽  
Egg Mass ◽  
Western Atlantic ◽  
Males And Females ◽  
Callinectes Danae

The capture of crabs of the genus Callinectes is one of the oldest extractive activities practised by waterside communities, due to the abundance of brachyurans along the Brazilian coast. The present paper aimed to provide basic information on the population biology of C. sapidus and C. danae during the period of December 2003 to November 2004, in Babitonga Bay, Joinville, Santa Catarina. The size of the first maturation of C. danae was estimated as 7.1 cm in total carapace width for females, and as 8.6 cm for males. Fecundity of the 20 females of C. danae with carapace width from 7.0 to 11.0 cm varied from 618,667 to 811,267 eggs. Fecundity of C. sapidus was higher, with a median of 978,000 eggs per female, but carapace widths in this species were also larger, with the highest frequency of females attaining 19.01 cm on average. In both species, a tendency was observed for the egg mass to increase with size of females. The capture per unit of effort presented the lowest values in summer, while the largest values occurred from March, August and November. A total of 80 males and 117 females of C. sapidus were captured in the four collecting areas, with the largest abundances in Area III (45.18%), followed by Areas II, IV and I. The size of the first maturation of C. sapidus was estimated as 10.2 cm for females and as 9.0 cm for males. Fishing effort was in relative equilibrium for adult stock (males = 58.75% and females = 52.99%) and juveniles (males = 41.25% and females = 47.01%). The largest monthly rates of biomass of C. sapidus occurred from April to November, with a peak of capture in August, without significant differences in the participation of males and females.

scholarly journals Biology of the thornback ray (Raja clavata Linnaeus, 1758) in the North Aegean Sea

2021 ◽  
Vol 50 (2) ◽  
pp. 115-127
Author(s):  
Koray Cabbar ◽  
Cahide Çiğdem Yiğin
Keyword(s):  
Aegean Sea ◽  
Total Weight ◽  
Total Length ◽  
The North ◽  
Disc Width ◽  
Thornback Ray ◽  
Raja Clavata ◽  
North Aegean ◽  
Males And Females ◽  
North Aegean Sea

Abstract The study deals with aspects of the population dynamics in the thornback ray (Raja clavata L., 1758), one of the most abundant cartilaginous fish caught in the North Aegean Sea. Females accounted for 73.08% and males 26.92% of all individuals. Total length of females and males ranged between 50.2 and 89.9 cm (disc width: 33.4–62.0 cm), and between 43.1 cm and 82.7 cm (disc width: 30.7–64.2 cm), respectively. Relationships between total length (TL) and total weight (TW), and between disc width (DW) and total weight (TW) were described by the equations: TW = 0.0041 TL3.10 and TW = 0.0178 DW3.03, respectively. Age data derived from vertebrae readings were used to estimate growth parameters using the von Bertalanffy function: L∞ = 101.71 cm, K = 0.18 y−1, t0 = −0.07 y for males and L∞ = 106.54 cm, K = 0.16 y−1, t0 = −0.28 y for females. The maximum age was 8 years for males and females. Total length at first maturity of males and females was 70.9 cm and 81.2 cm, respectively. Based on the gonadosomatic index and gonadal macroscopic observations, it was determined that the spawning period lasted throughout the year. Stomach content analysis showed that crustaceans (53.03% IRI) and teleosts (14.70% IRI) were the most preferred prey.

scholarly journals First report of Axianassa australis Rodrigues & Shimizu (Crustacea: Decapoda: Thalassinidea) along the coast of the state of Paraná, Brazil

2006 ◽  
Vol 35 ◽  
Author(s):  
Sonia Graça Melo ◽  
Jayme de Loyola e Silva ◽  
Setuko Masunari
Keyword(s):  
Geographic Distribution ◽  
Sao Paulo ◽  
The State ◽  
Lesser Antilles ◽  
Brazilian Coast ◽  
São Paulo ◽  
Southern Coast ◽  
Western Atlantic ◽  
First Report ◽  
The Family

The genus Axianassa Schmitt, 1924 from the family Laomediidaeis represented by six species along the Western Atlantic: Axianassaintermedia Schmitt occur in Curaçao, Lesser Antilles and Aruba; A.mineri Boone, 1931 in Panama and Mexico Gulf; A. arenaria Kensley & Heard, 1990 in the Mexico Gulf; A. canalis Kensley & Heard, 1990 in the Panama channel; A. jamaicense Kensley & Heard, 1990 in Jamaica and A. australis Rodrigues & Shimizu, 1992 in Brazil. Along the Brazilian coast, this genus has been formerly found in the states of Pernambuco, Bahia (Valença) and São Paulo (São Sebastião). According to STRASSER & FELDER (2005), this species is also recorded in southern Texas, USA. Based on the present work, the geographic distribution of A. australis is extended up to the state of Paraná, southern coast of Brazil.

scholarly journals The marine leech Stibarobdella loricata (Harding, 1924) (Hirudinea, Piscicolidae), parasitic on the angel shark Squatina spp. and sandtiger shark Carcharias taurus Rafinesque, 1810 (Chondrichthyes: Squatinidae, Carchariidae) in Southern Brazilian waters

2003 ◽  
Vol 63 (4) ◽  
pp. 691-694 ◽  
Author(s):  
J. M. R. Soto
Keyword(s):  
First Record ◽  
Southern Coast ◽  
Dorsal Region ◽  
Western Atlantic ◽  
Total Length ◽  
Parasitic Association ◽  
Carcharias Taurus

The presence of the marine leech, Stibarobdella loricata (Harding, 1924) (Hirudinea, Piscicolidae), is reported on the southern coast of Brazil, based on seven lots with 47 specimens, between 71 and 182 mm in total length, collected on the dorsal region of angel sharks, Squatina argentina (Marini, 1930); S. guggenheim Marini, 1936; S. punctata Marini, 1936 (Chondrichthyes, Squatinidae); and on the head of a sandtiger shark, Carcharias taurus Rafinesque, 1810 (Chondrichthyes, Carchariidae). This is the first record of S. loricata in the western Atlantic and of its parasitic association with S. argentina, S. guggenheim, S. punctata, and C. taurus.

Reproduction of French angelfish Pomacanthus paru (Teleostei: Pomacanthidae) and implications for management of the ornamental fish trade in Brazil

2016 ◽  
Vol 67 (5) ◽  
pp. 586 ◽  
Author(s):  
Caroline Vieira Feitosa ◽  
Simone Marques ◽  
Maria Elisabeth de Araújo ◽  
Beatrice Padovani Ferreira
Keyword(s):  
Ornamental Fish ◽  
Aquarium Trade ◽  
Size At Maturity ◽  
Size Dimorphism ◽  
Total Length ◽  
Management Measures ◽  
Ornamental Fish Trade ◽  
Males And Females ◽  
Catch Rates ◽  
Fish Trade

Pomacanthus paru is one of the five most exported species in the Brazilian aquarium trade and is frequently caught by traps as bycatch. The present study is the first to describe the reproductive biology of this species in the South Atlantic. The population of P. paru was gonochoristic and presented size dimorphism in the larger classes, with males attaining larger sizes than females. Differences in sex ratios for size classes were recorded over the range 35–45-cm total length. At the spawning stage females were more abundant than males, suggesting that spawning females may be more vulnerable to trap fishing during this period. The size at maturity was 23.30-cm total length for females. Males and females of P. paru at the spawning and spent stages were observed nearly every month. The susceptibility of this species to trap fishing indicates that management of the aquarium trade through quotas of juvenile captures alone may be not effective. Thus, management measures should focus on controlling the amount harvested by monitoring current catch rates and should consider implementing trap-free areas in important spawning grounds.

Redescription of Orthopristis ruber and Orthopristis scapularis (Haemulidae: Perciformes), with a hybridization zone off the Atlantic coast of South America

Zootaxa ◽  
2019 ◽  
Vol 4576 (1) ◽  
pp. 109 ◽  
Author(s):  
ALEXANDRE PIRES MARCENIUK ◽  
RODRIGO ANTUNES CAIRES ◽  
LEONARDO MACHADO ◽  
NAJILA NOLIE CATARINE DANTAS CERQUEIRA ◽  
RAYLA ROBERTA M. DE S. SERRA ◽  
...  
Keyword(s):  
South America ◽  
Nuclear Dna ◽  
Atlantic Coast ◽  
Morphological Characteristics ◽  
Distinct Species ◽  
Valid Species ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Western Atlantic ◽  
Coloration Patterns

The genus Orthopristis includes seven valid species, three from the western Atlantic and five from eastern Pacific, while the available identification guides and taxonomic keys incorrectly recognize Orthopristis ruber as the only valid species found on the Atlantic coast of South America. Efforts to expand the inventory of fish species from the northern coast of Brazil led to the identification of two distinct species of Orthopristis from Atlantic South America, based on the analysis of coloration patterns and meristic data, as well as DNA. In the present study, the limits of Orthopristis ruber are reviewed, while Orthopristis scapularis is recognized as a valid species for the northern and northeastern coasts of South America. Based on intermediate morphological characteristics and nuclear DNA markers, a hybrid zone was identified off the state of Espírito Santo, on the eastern Brazilian coast. Additionally, considerations are made on the diversity and biogeography of the coastal marine and estuarine fishes found on the Brazilian coast. 

Taxonomic remarks on Havelockia and Thyone (Echinodermata: Holothuroidea: Dendrochirotida), with descriptions of two new species from the Brazilian coast

2018 ◽  
Vol 99 (5) ◽  
pp. 1127-1134 ◽  
Author(s):  
Luciana Martins ◽  
Camilla Souto
Keyword(s):  
Brazilian Coast ◽  
Iodine Solution ◽  
Taxonomic Significance ◽  
Western Atlantic ◽  
Two New Species ◽  
Shallow Water Species ◽  
Species Descriptions ◽  
Calcareous Ring ◽  
Water Species ◽  
Synoptic Table

AbstractThyone and Havelockia are worldwide-distributed genera represented in the Western Atlantic by eight and three species, respectively. In this paper, we describe two new shallow-water species from the Brazilian coast: Thyone waltinhoi sp. nov. and Havelockia oraneae sp. nov. These genera are very similar morphologically but the presence of subdivisions in their calcareous rings separates them into different families, Thyone in Phyllophoridae and Havelockia in Sclerodactylidae. To observe the presence of subdivisions, we submerged the calcareous rings in an iodine solution prior to morphological analyses. Thyone waltinhoi sp. nov. differs from its Western Atlantic congeners in its dermal ossicles and Havelockia oraneae sp. nov. differs from its South-western Atlantic congeners in the composition of its introvert ossicles. In addition to species descriptions, illustrations and morphological diagnoses of both genera are provided, along with a synoptic table of their Western Atlantic species, and a discussion of the taxonomic significance of the dermal ossicles and the calcareous ring.

scholarly journals Morphometric characters and their relationship in estuarine catfish

1970 ◽  
Vol 6 (2) ◽  
pp. 349-353 ◽  
Author(s):  
M Begum ◽  
Abdullah Al-Mamun ◽  
ML Islam ◽  
MJ Alam
Keyword(s):  
Sexual Dimorphism ◽  
Linear Relationship ◽  
Standard Length ◽  
Head Length ◽  
Pectoral Fin ◽  
Morphometric Characters ◽  
Total Length ◽  
Length Standard ◽  
Eye Diameter ◽  
Males And Females

The morphometric observations were made on total length, standard length, pre-caudal length, head length, eye diameter and depth of body at pectoral fin base of estuarine catfish M. gulio. Males and females showed homogeneity in characters. A linear relationship was found between total length and morphometric characters. Regression of length and weight did not deviate significantly from cube law indicating isometric growth. The fish exhibited sexual dimorphism. Keywords: Morphometric characters; Estuarine catfish; Mystus gulio DOI: 10.3329/jbau.v6i2.4833 J. Bangladesh Agril. Univ. 6(2): 349-353, 2008

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