scholarly journals Reproductive aspects of the gulf pipefish, Syngnathus scovelli (Teleostei: Syngnathidae), from Southeastern Brazil

1999 ◽  
Vol 59 (1) ◽  
pp. 87-90 ◽  
Author(s):  
J. L. GASPARINI ◽  
R. L. TEIXEIRA
Keyword(s):  
Sex Ratio ◽  
Sandy Beach ◽  
Surf Zone ◽  
Southeastern Brazil ◽  
Immature Male ◽  
Female Sex ◽  
Total Length ◽  
Minimum Number ◽  
Males And Females ◽  
The Relationship

This study attempts to assess the relationship between fecundity and fertility of males and females of the gulf pipefish, Syngnathus scovelli. Specimens of this pipefish were collected in detached algae in the inner surf-zone of a dissipative sandy beach in southeastern Brazil. 97 specimens were collected, and they were associates to detached algae. From these, 14 were males, 36 females and 47 immature. Male-female sex ratio was 0.4:1, which was significantly different from the expected 1:1 ratio. Fish ranged from 43 to 98 mm TL (Fig. 1), and males and females showed similar size. Only 7 males were pregnants, while 9 females had hydrated oocytes. Minimum number of eggs/embryos in the pouch was 30 and the maximum 92. Minimum number of hydrated oocytes was 36, and the maximum was 165. The number of egg/embryos, and hydrated oocytes were weakly related to total length. It seems that the gulf pipefish occupy the inner surf-zone of the Praia do Iate are brought to the shallows accidentally when the specimens were inhabiting drifting vegetation.

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 ASPEK BIOLOGI DAN DAERAH PENANGKAPAN CUCUT BOTOL (Squalus sp.) YANG TERTANGKAP DI PERAIRAN SAMUDERA HINDIA

2017 ◽  
Vol 13 (1) ◽  
pp. 35
Author(s):  
Dharmadi Dharmadi ◽  
Fahmi Fahmi
Keyword(s):  
Indian Ocean ◽  
Deep Water ◽  
Fishing Season ◽  
Total Length ◽  
Study Results ◽  
The Indian Ocean ◽  
Dogfish Shark ◽  
Males And Females ◽  
The Relationship ◽  
Fishing Area

Penelitian mengenai keragaman jenis Elasmobranchi dilakukan pada bulan Januari sampai dengan Desember 2002 di pelabuhan-pelabuhan perikanan PPI Cilacap, TPI Palabuhanratu, TPI Kedonganan-Bali, dan PPI Tanjung Luar-Lombok Timur. Cucut botol Squalus sp. merupakan jenis cucut laut dalam yang paling sering dijumpai selama penelitian berlangsung. Hasil penelitian menunjukkan bahwa cucut botol betina lebih sering tertangkap dibandingkan cucut jantan pada setiap waktu pengamatan. Frekuensi panjang cucut botol tertinggi dijumpai pada bulan Juni danAgustus yaitu berkisar antara 62 sampai dengan 68 cm. Nisbah kelamin cucut botol antara jantan betina selama pengamatan adalah 1:1,83. Hubungan antara panjang total tubuh dan panjang klasper cenderung linier dengan nilai R2=0,634326. Puncak musim penangkapan cucut botol terjadi sekitar bulan Agustus. Sedangkan daerah penangkapan cucut botol adalah di perairan Samudera Hindia. A study on diversity Elasmobranchi of was conducted using market surveys method from January to December 2002 at several fish landings in southern Indonesia, i.e. the Cilacap, Palabuhanratu, Kedonganan- Bali, and Tanjung Luar-East Lombok landing sites.A deep water shark, Indonesian shortnose spurdog (Squalus sp.), was the most common deep water sharks captured in the area during the study. Results show that females sharks were caught more frequent at every observation than those of males. The most abundant of Indonesian shortnose spurdog was recorded in June and August ranging from 62 to 68 cm in total length. Sex ratio between males and females of Squalus sp. during the study was 1:1.83, and the relationship between total length and claspers length of dogfish shark was linier (R2=0.634326). The peak fishing season of Indonesian spurdog was occurred in August with the fishing area was in the Indian Ocean.

scholarly journals MORPHOMETRICS OF JUVENILE WHITE SHRIMP IN SANTOS (SP, BRAZIL) - AN ATLANTIC STRESSED ESTUARY

2020 ◽  
Vol 46 (3) ◽  
pp. 1-6
Author(s):  
Felippe Veneziani ABBATEPAULO ◽  
◽  
Sergio Luiz dos Santos TUTUI ◽  
Acacio Ribeiro Gomes TOMÁS ◽  
◽  
...  
Keyword(s):  
White Shrimp ◽  
Small Scale ◽  
Body Measurement ◽  
Recreational Fisheries ◽  
Southwest Atlantic ◽  
Small Scale Fisheries ◽  
Total Length ◽  
Males And Females ◽  
Live Bait ◽  
The Relationship

Shrimps are one of the world’s most valuable fishing resources, with the Penaeidae family having the greatest economic importance. In the southwest Atlantic the white shrimp Litopenaeus schmitti plays an important socioeconomic role for small-scale fisheries, and juveniles are targeted as live bait for recreational fisheries. This study was carried out monthly along two periods (May/2009‑January/2010 and March/2011-March/2015) at Santos estuary and aimed to investigate the relationship between morphometric and sex of the early development stages of Litopenaeus schmitti. A total of 6,978 individuals were caught and measured, with no differences (p>0.1) between sexes shown regarding total length or weight. Differences between males and females were found for Total length (TL) x Carapace length (CL) and TL x Total weight (TW) and negative allometries (b<3) were found for all relationships. The results indicate that morphometric differences among sexes seem to be more associated with total length, suggesting that TL could be a more appropriate body measurement to compare specimens of L. schmitti, at least when the analysis includes juveniles. The presence of L. schmitti specimens all year long inside the estuary reinforces the idea of a continuous reproductive cycle with peak periods. Both information comes to fulfill part of the lack of knowledge regarding this species estuarine phases.

Sociosexuality and sex ratio: Sex differences and local markets

2005 ◽  
Vol 28 (2) ◽  
pp. 288-288
Author(s):  
John Lazarus
Keyword(s):  
Sex Differences ◽  
Sex Ratio ◽  
Local Level ◽  
Psychological Effects ◽  
Operational Sex Ratio ◽  
Know How ◽  
Males And Females ◽  
Mating Market ◽  
The Relationship ◽  
Ratio Measure

Operational sex ratio (OSR) is the correct sex ratio measure for predicting sociosexuality, but it is unclear whether this is the measure used. It would be valuable to know how OSR and sociosexuality correlate separately for males and females. The relationship between sociosexuality and OSR should also be examined with OSR measured at the local level of the mating market, where sex ratio must be having its psychological effects.

scholarly journals On the fecundity and sex-ratio of Botia Dario (Hamilton) (Cypriniformes : Cobitidae)

1970 ◽  
Vol 26 ◽  
pp. 27-29 ◽  
Author(s):  
M Afzal Hussain ◽  
Mst Rehana Khatun ◽  
M Altaf Hossain
Keyword(s):  
Body Weight ◽  
Sex Ratio ◽  
Standard Length ◽  
Female Ratio ◽  
Ovary Weight ◽  
Total Length ◽  
Length Standard ◽  
The Mean ◽  
The Relationship ◽  
Male To Female

A total of 1183 Botia Dario (Hamilton) samples were collected from Rajshahi (Shaheb Bazar, Binodpur Bazar, Talaimari Bazar, Kazla Bazar and Godagari) during the period from January, 2002 to August, 2003 to study the fecundity, sex-ratio, relationship between fecundity and total length, standard length, body weight, ovary length as well as ovary weight. The mean fecundity was calculated as 31833.50±10313.42 with a range of 5245 to 53754 in fishes ranging in total length from 96 mm to 135 mm (mean 115.50±12.11 mm) and in body weight from 14.51 g to 43.29 g (mean 29.71±6.91 g). The relationship between the fecundity (F) and total length (TL), standard length (SL), body weight (BW), ovary length (OL) and ovary weight (OW) were found to be linear with the ‘r’ values 0.94, 0.94, 0.95, 0.92 and 0.98, respectively. The ovum diameter ranged from 0.3 to 0.72 mm and the mean diameter was calculated as 0.518±0.06 mm. The male to female ratio was 1:0.61. Key words: Botia dario, fecundity, sex-ratio. Univ. j. zool. Rajshahi Univ. Vol. 26, 2007. pp. 27-29

Infestation of ectoparasites in Gudusia chapra (Hamilton)

1970 ◽  
Vol 25 ◽  
pp. 23-25 ◽  
Author(s):  
Hamida Khanum ◽  
Haroon Or Rashid Khan ◽  
Rimi Farhana
Keyword(s):  
Sex Ratio ◽  
Key Words ◽  
Infection Rate ◽  
Monthly Basis ◽  
Female Sex ◽  
Infestation Intensity ◽  
Males And Females ◽  
The Mean

One hundred Gudusia chapra ranging from 6 to 17 cm were examined on monthly basis. Of 100 fishes, 32 were male and 68 were female, sex ratio being 1:2.1. A total of 163 parasites were recovered from the host, which 70% were trematodes and 16% copepods. The overall prevalence of infection was 86% and the mean±SD intensity was 1.89±0.91. Heavy infestations (100%) were recorded in males of the largest (14.25-17.0 cm) and the smallest (6.0-8.75 cm) length groups. Total infection rate was also higher in males (87.72%) than in females (83.82%). Intensity of infestation in males and females was 1.62 and 2.03, respectively. Key words: Gudusia chapra, ectoparasites, trematode, copepod, infestation intensity Univ. j. zool. Rajshahi Univ. Vol.25 2006 p.23-25

scholarly journals Population structure and reproductive biology of Haemulopsis corvinaeformis (Perciformes, Haemulidae) in the south coast of Pernambuco, northeastern Brazil

2018 ◽  
Vol 108 (0) ◽  
Author(s):  
Leandro N. Eduardo ◽  
Alex S. Lira ◽  
Thierry Frédou ◽  
Flavia Lucena Frédou
Keyword(s):  
Population Structure ◽  
Reproductive Biology ◽  
Management Practices ◽  
Northeastern Brazil ◽  
Important Species ◽  
Shrimp Fishery ◽  
Total Length ◽  
Males And Females ◽  
First Maturity ◽  
The Relationship

ABSTRACT: Roughneck Grunt (Haemulopsis corvinaeformis Steindachner, 1868) is the second most important species caught as bycatch of the shrimp fishery in Pernambuco, Northeastern Brazil. However, the population dynamic of this species is poorly known in the region. The aim of this study was to describe aspects of the population structure and reproductive biology of the H. corvinaeformis, providing important information for the development of sustainable management practices. Specimens were collected monthly from August 2011 to July 2012 and quarterly from October 2012 to June 2014. A total of 1,140 individuals was collected; 340 males (29.8%), 391 females (34.3%), and 409 were immature and could not be sexed (35.9%). Total length ranged from 7 to 25 cm. In general, total length of females [12.85 ± 2.49 cm (mean± SD)] and males [12.72 ± 2.46 cm (mean ± SD)] were similar (p > 0.05). The proportion of males and females was similar along the year, except in March. The relationship between total length and total weight was statistically significant (p< 0.05), showing an isometric growth. The (GSI) coupled with the distribution of maturational stages suggests that females reproduce all year around, with a peak during October-November. The length at first maturity (L50) was estimated at 11.88 cm for females and 11 cm for males.

scholarly journals On the Fecundity and Sex-ratio of Labeo bata (Hamilton) (Cypriniformes: Cyprinidae)

2015 ◽  
Vol 11 (2) ◽  
pp. 43-48
Author(s):  
MAR Joadder
Keyword(s):  
Body Weight ◽  
Sex Ratio ◽  
Average Length ◽  
Total Body Weight ◽  
Total Length ◽  
Labeo Bata ◽  
The Mean ◽  
Total Body ◽  
Gravid Females ◽  
The Relationship

The fecundity and sex- ratio of 2200 Labeo bata (Hamilton) specimens were studied. The fecundity of 234 gravid females varied from 51,354( for a fish with total length of 127.3 mm and total body weight of 20.0 g) to 91,568( for a fish with total length of 256.6 mm and total body weight of 156.70g).The mean fecundity was recorded as 67,617.50±13,510.15 for the average length and weight of 192.98±41.06 mm and 87.79±49.07 g, respectively .The mean total length and weight of gonad was 67.62± 24.01 mm and 20.35±13.50 g, respectively .The relationship between fecundity ( F.) and other parameters such as total length ( TL ), Standard length ( SL),  total weight( TW),  gonadal length (GL),  gonadal weight (GW) and gonadal depth (GD) were studied. DOI: http://dx.doi.org/10.3329/jsf.v11i2.21595 Journal of Science Foundation, 2013;11(2):43-48

scholarly journals BEBERAPAASPEKBIOLOGI CUMI-CUMI JAMAK(Loligo duvaucelli) YANGDIDARATKAN DI BLANAKAN, SUBANG, JAWABARAT

2017 ◽  
Vol 3 (6) ◽  
pp. 357
Author(s):  
Umi Chodrijah ◽  
Tri Wahyu Budiarti
Keyword(s):  
Sex Ratio ◽  
Economic Value ◽  
Stomach Contents ◽  
Food Composition ◽  
Mantle Length ◽  
Small Fish ◽  
Biological Aspect ◽  
Biological Characters ◽  
Males And Females ◽  
The Relationship

Cumi-cumi (Loligo sp.) merupakan salah satu sumber daya hayati laut yang memiliki nilai ekonomis penting dan mengandung nilai gizi tinggi dengan cita rasa yang khas. Pengamatan terhadap beberapa aspek biologi cumi-cumi jamak (Loligo duvaucelli) telah dilakukan pada bulan Juni 2005 sampai Nopember 2006 di Pusat Pendaratan Ikan Blanakan, Kabupaten Subang, Jawa Barat. Penelitian ini bertujuan untuk mengetahui sebaran panjang mantel, nisbah kelamin, komposisi makanan, serta hubungan panjang mantel dan bobot cumi-cumi jamak. Pengukuran karakter biologi meliputi panjang mantel (ML), bobot tubuh (W), dan isi perut. Hasil penelitian ini menunjukkansebaran panjang mantel cumi-cumi yang tertangkap berkisar antara 3,0-36,0 cm dengan modus 15 cm dan panjang mantel rata-rata 13,3 cm. Nisbah kelamin cumi-cumi pada bulanApril dan Juni 2006 dalamkeadaan tidak seimbang. Pola pertumbuhan cumi-cumi baik jantanmaupun betina bersifat alometrik negatif. Cumi-cumi merupakan karnivora yang makanan utamanya adalah ikan-ikan kecil. The squid is one of living marine resources that have important economic value and conyain high nutrional value with a distinctive taste. Observation on the biological aspect of squid jamak) was performed in June 2005 to November 2006 in Blanakan, Subang,West Java. This study aims to determine the distribution of mantle length, sex ratio, food composition, and the relationship mantle and weight of squid. Measurement of biological characters include mantle length (ML), body weight (W), and stomach contents. The results showed that the distribution of squid mantle length capture at Blanakan, ranges from 3.0-36.0 cm with a mode at 15 cm and an average mantlelength of 13.3 cm. The squid sex ratio in April and June 2006 in a state of imbalance. The growth rate of the squid both males and females are allometric negative. The squid is a carnivorous diet is primarily small fish. 

scholarly journals Age and growth of two bream species in the Tudakul reservoir of Uzbekistan

2021 ◽  
Vol 244 ◽  
pp. 02041
Author(s):  
B. Kamilov ◽  
M. Yuldashov ◽  
R. Khakimova ◽  
M. Ibodova
Keyword(s):  
Total Body Length ◽  
Age And Growth ◽  
Average Height ◽  
Average Growth ◽  
Total Length ◽  
Males And Females ◽  
Total Body ◽  
First Maturity ◽  
The Relationship ◽  
White Bream

The study was carried out in 2014-2018 at the Tudakul reservoir, Uzbekistan. Samples included 278 European bream (Abramis brama), and 83 Amur white bream (Parabramis pekinensis). The age, total length and weight of the fish varied from 1 to 5 years, from 14 to 50 cm, from 30 to 1,405 g for the European bream and from 1 to 6 years, from 24 to 53.5 cm and 105 – 2,138 g for the white Amur bream and European bream, respectively. The relationship between total length (TL) and weight (W) is described by the equation W = 0.005 * TL3.2555 (r = 0.98) for European bream and W = 0.005 * TL3.201 (r = 0.96) for white Amur bream. Recovered average growth rate of European bream: TL1 - 13.5 cm; TL2 - 28.1 cm, TL3 - 37.95 cm, TL4 - 42.6 cm, TL5 - 48.6 cm.The average height of the Amur white bream: TL1 - 12.6 cm, TL2 - 23.3 cm, TL3 - 31.5 cm, TL4 - 37.9 cm, TL5 - 41.7 cm, TL6 - 44.2 cm. Lee’s phenomenon did not appear. All yearling fish were juvenile. In 2-year-old fish of both sexes of both species, the gonads were at stage II. Males and females of both species reached their first maturity at 3-4 years of age, when the total body length of the European bream was 30–32 cm, and the Amur white bream was 34–35 cm.

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