Larvas de Cynoscion leiarchus, Menticirrhus americanus, Micropogon furnieri, Stellifer rastrifer, Macrodon ancylodon e Isopisthus parvipinnis coletados na região Estuarino-Lagunar de Cananéia são descritas e ilustradas. A identificação foi baseada em caracteres morfológicos de jovens e adultos, caracteres merísticos e inclusive padrões de pigmentação. Informações sobre distribuição das larvas de peixes durante o ano e a provável área de desova são também mencionadas.
Data from ichthyoplankton surveys between 1980 and 1990 are used to describe the distribution of bluefish (Pomatomus saltatrix) larvae along the continental shelf off southern Brazil (24�-35�S). Only 46 larvae in 9 stations were found in 1026 oblique and horizontal tows taken with a 330 pm-mesh Bongo net. Larvae ranged in size from 3 to 10 mm, with the larger larvae distributed close to shore. There were no significant differences in size between larvae found in the northern and southern regions of the shelf. However, there was evidence of a gradual northward displacement of larval abundance towards winter. About 85% of the larvae occurred in the southernmost region of the shelf (below 32�S) in January and February (summer), and the remaining larvae were caught further north from March to August. This pattern of larval distribution could be attributed to the northwards retreat of warmer (> 20�C) and more saline (> 34) Brazilian coastal waters from the region. Results from this study suggest that bluefish spawn over a protracted period, following the seasonal displacement of Brazilian coastal waters along the continental shelf off southern Brazil, a pattern that is also consistent with the spawning migration proposed for bluefish in the north-western Atlantic.
RESUMOO objetivo deste trabalho foi analisar o padrão de distribuição espacial e temporal da biomassa planctônica, descrever a estrutura hidrográfica da massa d'água e analisar a relação entre os níveis de biomassa planctônica e a pluviosidade na costa norte da Bahia, Brasil. As amostras foram coletadas entre maio/1993 e março/1994, em 12 estações de amostragem, durante 4 meses. O fitoplâncton (clorofila a) e o zooplâncton (biovolume do microplâncton) foram coletados através de garrafa de van Dorn e de rede cônica, com malhas de 120µm de abertura, respectivamente. No estudo hidrográfico as seguintes variáveis foram avaliadas: temperatura, salinidade, pH, saturação de oxigênio, turbidez e amônia. As massas de água presentes no norte da Bahia foram caracterizadas como Água Costeira e Água Oceânica. Os resultados demonstraram que existem diferenças significativas, sazonais e espaciais, principalmente nas variáveis hidroquímicas e secundariamente nos níveis de biomassa planctônica. A análise multivariada revelou dois agrupamentos entre as estações de amostragem; o grupo 1, formado pelas estações sob influência do período seco (setembro e dezembro de 1993) e o grupo 2, formado pelas estações sob influência do período chuvoso (maio/1993 e março/1994).Palavras Chaves: biomassa fitoplanctônica, clorofila; zooplâncton; biovolume; massa d´água. ABSTRACT Planktonic Biomass, Hydrography and Rainfall at Bahia north shore, BrazilThe objective of this study was to study the spatial and temporal pattern distribution of the planktonic biomass, the hydrographical structure of the water and to relate the levels of plankton biomass to the rainfall at Bahia north shore, Brazil. Samples were collected between May 1993 and March 1994, in twelve stations, during four oceanographic cruises. The phytoplankton (chlorophyll a) and the zooplankton (microplankton biomass) were collected with a van Dorn bottle and with a conical net 120µm mesh size, respectively. Temperature, salinity, pH, saturation of oxygen, transparency, ammonium data were obtained simultaneouly for comparation with the plankton biomass. The northern region of the Bahia could be characterized by the Coastal and Oceanic water masses. There were significant differences between stations and seasons (p < 0,05), as far as
A preliminary study on the distribution and abundance of ichthyoplankton related with ecological data were made during the southern summer 1982/83 from material collected from the oceanographic R/V “ Professor W. Besnard” in the Bransfield Strait — Antarctica.From 210 larvae caught in the area, 10 species were identified: Pleuragramma antarcticum, Notothenia larseni, Notothenia gibberifons, Notothenia kempi, Notothenia nudifrons (Nototheniidae); Notolepis coatsi (Paralepididae); Electrona antarctica (Myctophidae); Artedidraco skottsbergi, Harpagifer bispinis (Harpagiferidae) and Champsocephalus gunnari (Channichthyidae).Besides this, the spawning period and occurrence of larvae related with water masses were considered. ICTIOPLÂNCTON DO ESTREITO DE BRANSFIELD — ANTÁRTICAEstudo preliminar sobre distribuição e abundância de ictioplâncton relacionado com os dados ecológicos foi realizado durante o verão austral 1982/83 com o material coletado a bordo do N/Oc. “ Professor W. Besnard” , no Estreito de Bransfield — Antártica. Dos 210 exemplares de larvas capturadas na área, 10 espécies foram identificadas: Pleuragramma antarcticum, Notothenia larseni, Notothenia gibberifrons, Notothenia kempi, Notothenia nudifrons (Nototheniidae); Notolepis coatsi (Paralepididae); Electrona antarctica (Myctophidae); Artedidraco skottsbergi, Harpagifer bispinis (Harpagiferidae) and Chanrtpsocephalus gunnari (Channichthyidae).Paralelamente foram considerados o período de desova e a ocorrência das larvas relacionada com massas de água.
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