Temporal Trends in Abundance of Fish in the Tidal Delaware River

Weisberg, Stephen B.; Himchak, Peter; Baum, Tom; Wilson, Harold T.; Allen, Russell

doi:10.2307/1352531

Cited by 35 publications

(17 citation statements)

References 13 publications

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“…Therefore, estuaries may be regarded as very important areas for the growth of many fish species (Moyle and Cech Jr., 1996;Rozas and Minello, 1997). The high levels of food availability, as well as protection against predators, favor the permanence of fish in estuaries (Weisberg et al, 1996;Rönnbäck, 1999). In estuaries, several intertidal and subtidal environments offer abundant and diverse food resources, protection against predation, and other favorable environmental conditions for the growth and survival of fish (Patterson and Whitfield,200).…”

Section: Introductionmentioning

confidence: 99%

O papel de praias estuarinas como habitats para peixes em um ambiente subtropical brasileiro

Souza-Conceição¹,

Spach²,

Bordin³

et al. 2013

Neotropical Biology and Conservation

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Little information exists about the dynamics of the use of estuarine beaches by fishes. The present study describes the spatial and temporal changes in the fish assemblage of the estuarine beaches of Babitonga Bay, Santa Catarina State (Brazil). A total of 13 collections were conducted at seven estuarine beaches of Babitonga Bay from August 2005 to August 2006. At each sampling site, beach seine tows parallel to the coast were made, each with a different seine net. A total of 45,874 individuals (76 taxa) (>99% juveniles) was caught in 273 samplings. Paralichthyidae and Sciaenidae had the largest number of species, followed by Carangidae, Gobiidae, Gerreidae, Engraulidae, Mugilidae and Tetraodontidae. The following taxa were the most abundant: Lycengraulis grossidens, Mugil sp., Atherinella brasiliensis, Eucinostomus sp., Harengula clupeola, Sphoeroides greeleyi, Eucinostomus argenteus and Sphoeroides testudineus, comprising 93.34% of the total catch. There were significant differences among months regarding the mean number of individuals, number of species, diversity and evenness. Considering that the conservation of the studied beaches is under constant threat, the data surveyed in this work show the necessity of conservation and management plans for these environments, important as nurseries for fishes.Key words: juvenile fish, shallow waters, diversity, nursery, Babitonga Bay. ResumoExistem poucas informações sobre a dinâmica do uso de praias estuarinas por peixes. Este trabalho descreveu as mudanças temporais e espaciais na assembléia de peixes de praias estuarinas na baía da Babitonga, Santa Catarina, Brasil. De agosto de 2005 a agosto de 2006, foram realizadas treze coletas em sete praias estuarinas do setor polihalino da baía da Babitonga. Na margem de cada ponto amostral, foram realizados três arrastos paralelos à linha de costa com redes tipo picaré. Nas 273 amostras obtidas foram capturados 45.874 indivíduos (76 táxons), predominantemente juvenis (>99%). Maior número de espécies foi observado em Paralichthyidae e Sciaenidae, seguidas por Carangidae, Gobiidae, Gerreidae, Engraulidae, Mugilidae e Tetraodontidae. Os seguintes táxons foram os mais abundantes na área: Lycengraulis grossidens, Mugil sp., Atherinella brasiliensis, Eucinostomus sp., Harengula clupeola, Sphoeroides greeleyi, Eucinostomus argenteus e Sphoeroides testudineus, os quais constituíram 93,34% da captura total. Diferenças significativas mensais ocorreram entre o número médio de indivíduos, número de espécies, diversidade e equitabilidade. Considerando que a conservação das praias estudadas está sob constante ameaça, os dados coletados nesse trabalho mostram a necessidade de elaboração de planos de conservação e manejo dessas importantes áreas de criação para peixes.Palavras-chave: peixes juvenis, águas rasas, diversidade, criadouro, baía da Babitonga.The role of estuarine beaches as habitats for fishes in a Brazilian subtropical environment O papel de praias estuarinas como habitats para peixes em um ambiente subtropical brasil...

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Section: Introductionmentioning

confidence: 99%

O papel de praias estuarinas como habitats para peixes em um ambiente subtropical brasileiro

Souza-Conceição¹,

Spach²,

Bordin³

et al. 2013

Neotropical Biology and Conservation

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show abstract

“…They serve important economic functions including transportation, industry and tourism, but also drainage of waste from domestic, industrial and agriculture activities (Heip & Herman 1995;RazGuzman & Huidobro 2002). Simultaneously, these ecosystems offer protection, not only for resident species, but also for a wide range of marine and freshwater species which migrate there at certain stages of their life cycle (Weinstein 1985;Weisberg et al 1996;Cowley and Whitfield 2002;McLusky and Elliott 2004;Blaber 2000). Fish assemblage structure of estuaries is characterized by high diversity and high abundance, especially for juveniles (Whitfield 1999).…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial distribution of fish and shrimp assemblage in the Bakkhali river estuary of Bangladesh in relation to some water quality parameters

Rashed-Un-Nabi

Al-Mamun

Ullah

et al. 2011

Marine Biology Research

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Fish and shrimp species, together with water quality data, were collected from two different stations located inside the Bakkhali river estuary of Bangladesh during winter, premonsoon and monsoon periods. Significant temporal differences were observed for water temperature, salinity and dissolved oxygen. The average catch of fish and shrimps per net between stations varied between 1.8990.36 kg at station 1 and 7.5494.39 kg at station 2, while the average catch in winter, premonsoon and monsoon periods was found to be 2.7991.08 kg/net, 6.3191.03 kg/net and 5.0692.89 kg/net, respectively, with a significant difference in catch per net between stations although no significant difference in catch per net was observed between seasons. A total of 18,467 individuals of fish (35 species) and shrimp (10 species) were found in the present study. Three species of shrimps were observed to be dominant ( 10.0%) and these were Metapenaeus lysianassa (17.07%), Ambassis dussumieri (14.54%) and Macrobrachium villosimanus (12.13%). Clear differences in faunal abundances were observed between seasons and stations with higher mean abundances during winter (1747.839421.99 individuals/5 kg) and at Station 1 (14449866.74 individuals/5 kg). Similarly, the diversity indices, both ShannonÁWiener and Margalef, showed significant differences between stations and seasons (except Shannon for stations). Analyses of similarity (ANOSIM) results confirm both spatial and temporal differences in species community structure with a highly diverse assemblage. Canonical Correspondence Analysis results indicated that salinity and transparency were the main variables influencing fish and shrimp distribution in the Bakkhali river estuary.

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“…8). The increase in fish abundance in the tidal Delaware related closely to improving water quality conditions (Weisberg et al 1996). In 1996, the Delaware Estuary Program reported "dramatic improvements in water quality since the 1960s" as the Delaware River was cited as "a prime example of the environmental benefits of …”

Section: -2009mentioning

confidence: 99%

“…Catch per haul of fish species in the DelawareRiver, 1980-1993(Weisberg et al 1996 Catch per Haul (95% C. I.)…”

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confidence: 99%

Water quality trends in the Delaware River Basin (USA) from 1980 to 2005

Kauffman

Homsey

Belden

et al. 2010

Environ Monit Assess

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In 1940, the tidal Delaware River was "one of the most grossly polluted areas in the United States." During the 1950s, water quality was so poor along the river at Philadelphia that zero oxygen levels prevented migration of American shad leading to near extirpation of the species. Since then, water quality in the Delaware Basin has improved with implementation of the 1961 Delaware River Basin Compact and 1970s Federal Clean Water Act Amendments. At 15 gages along the Delaware River and major tributaries between 1980 and 2005, water quality for dissolved oxygen, phosphorus, nitrogen, and sediment improved at 39%, remained constant at 51%, and degraded at 10% of the stations. Since 1980, improved water-quality stations outnumbered degraded stations by a 4 to 1 margin. Water quality remains good in the nontidal river above Trenton and, while improved, remains fair to poor for phosphorus and nitrogen in the tidal estuary near Philadelphia and in the Lehigh and Schuylkill tributaries. Water quality is good in heavily forested watersheds (>50%) and poor in highly cultivated watersheds. Water quality recovery in the Delaware Basin is coincident with implementation of environmental laws enacted in the 1960s and 1970s and is congruent with return of striped bass, shad, blue crab, and bald eagle populations.

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Temporal Trends in Abundance of Fish in the Tidal Delaware River

Cited by 35 publications

References 13 publications

O papel de praias estuarinas como habitats para peixes em um ambiente subtropical brasileiro

O papel de praias estuarinas como habitats para peixes em um ambiente subtropical brasileiro

Temporal and spatial distribution of fish and shrimp assemblage in the Bakkhali river estuary of Bangladesh in relation to some water quality parameters

Water quality trends in the Delaware River Basin (USA) from 1980 to 2005

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