Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil
The objective of this study was to analyze population structure (spatial distribution, seasonal distribution and distribution by length classes, sex ratio and length-weight relationship) and aspects of the reproductive biology of Loricariichthys melanocheilus. Fish were sampled bimonthly using gilln...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
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| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200371&lng=en&tlng=en |
| _version_ | 1811255938870411264 |
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| author | Éverton Luís Zardo Everton Rodolfo Behr |
| author_facet | Éverton Luís Zardo Everton Rodolfo Behr |
| author_sort | Éverton Luís Zardo |
| collection | DOAJ |
| description | The objective of this study was to analyze population structure (spatial distribution, seasonal distribution and distribution by length classes, sex ratio and length-weight relationship) and aspects of the reproductive biology of Loricariichthys melanocheilus. Fish were sampled bimonthly using gillnets and trammel nets in lentic and lotic environments in the rio Ibicuí, between the years 2000 and 2001. Were collected 410 specimens: 230 females, 164 males and 16 specimens whose sex could not be determined. A greater number of specimens were collected in October/November and December/January and in lentic environments. The greater length classes had a higher amount of females (p < 0.05) and the sex ratio in all sampling periods was 1.38 females per male. Both males and females showed positive allometric growth (b = 3.299 and b =3.487, respectively). The highest values for gonadosomatic index (GSI) and gonadal condition factor (K) were observed from August/September and peaked in October/November, just like the highest frequencies of females at maturity stage C (mature), which is indicative that the breeding season occurs at this time. |
| first_indexed | 2024-04-12T17:32:32Z |
| format | Article |
| id | doaj.art-fc4316e5101c49f685832c212128dc6d |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-04-12T17:32:32Z |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-fc4316e5101c49f685832c212128dc6d2022-12-22T03:23:06ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-022413237138210.1590/1982-0224-20140052S1679-62252015000200371Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, BrazilÉverton Luís ZardoEverton Rodolfo BehrThe objective of this study was to analyze population structure (spatial distribution, seasonal distribution and distribution by length classes, sex ratio and length-weight relationship) and aspects of the reproductive biology of Loricariichthys melanocheilus. Fish were sampled bimonthly using gillnets and trammel nets in lentic and lotic environments in the rio Ibicuí, between the years 2000 and 2001. Were collected 410 specimens: 230 females, 164 males and 16 specimens whose sex could not be determined. A greater number of specimens were collected in October/November and December/January and in lentic environments. The greater length classes had a higher amount of females (p < 0.05) and the sex ratio in all sampling periods was 1.38 females per male. Both males and females showed positive allometric growth (b = 3.299 and b =3.487, respectively). The highest values for gonadosomatic index (GSI) and gonadal condition factor (K) were observed from August/September and peaked in October/November, just like the highest frequencies of females at maturity stage C (mature), which is indicative that the breeding season occurs at this time.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200371&lng=en&tlng=enArmored catfishBreeding seasonCondition factorGonadosomatic indexHepatosomatic index |
| spellingShingle | Éverton Luís Zardo Everton Rodolfo Behr Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil Neotropical Ichthyology Armored catfish Breeding season Condition factor Gonadosomatic index Hepatosomatic index |
| title | Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil |
| title_full | Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil |
| title_fullStr | Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil |
| title_full_unstemmed | Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil |
| title_short | Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil |
| title_sort | population structure and reproductive biology of loricariichthys melanocheilus reis pereira 2000 siluriformes loricariidae in the rio ibicui brazil |
| topic | Armored catfish Breeding season Condition factor Gonadosomatic index Hepatosomatic index |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200371&lng=en&tlng=en |
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