The effects of acute and chronic exposure to water salinity on juveniles of the carnivorous freshwater catfish Lophiosilurus alexandri

Mattioli, Cristiano Campos; Takata, Rodrigo; Leme, Fabíola Oliveira Paes; Costa, Deliane Cristina; Filho, Reinaldo Melillo; Silva, Walisson de Souza e; Luz, Ronald Kennedy

doi:10.1016/j.aquaculture.2017.08.016

Cited by 49 publications

(18 citation statements)

References 65 publications

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“…The hematological values of the present study are consistent with those described previously for the same species, including values reported for erythrocytes and leukocytes by Mattioli et al (2017), hematocrit by Kitagawa et al (2015) and plasmatic protein by Costa et al (2016). The increase in the number of erythrocytes and hematocrit on the fifth and tenth day after tagging may be related to stress caused dur-ing the management of the fish, since they took eight days to start feeding.…”

Section: Discussionsupporting

confidence: 91%

An external tag for fish: tagging effects in different fish size classes and its influence on growth performance and hematology of Lophiosilurus alexandri (Siluriformes: Pseudopimelodidae)

Boaventura

Gil

Gil³

et al. 2019

Neotrop. ichthyol.

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This study tested an external tag for juveniles of Lophiosilurus alexandri and measured the effects of tagging in different size classes of fishes. Experiment 1 evaluated the retention rate and influence of the tag on survival and growth of three hundred fishes divided Small, Medium and Large size classes. After 90 days of experiment the fishes had 100% survival and the tag had a higher retention rate for animals of the Large size class. Experiment 2 evaluated the tag’s influence on hematology parameters of forty-two fishes at 5, 10 and 30 days post-tagging. In this experiment both tagged and untagged animals experienced 9.4% mortality. The hematocrit was higher on the 30th day for tagged animals than for untagged animals. No difference was observed for leukocytes, plasma protein, erythrocytes and mean corpuscular volume. It was concluded from Experiment 1 that the tag reduced growth performance when applied to small sized juvenile L. alexandri, and that the tag retention rate increased with increasing animal size. Among the hematological parameters studied for juveniles on the Experiment 2 the tag only influenced the hematocrit parameters, which shows that the tag can be used without considerable influence on the hematological parameters of juvenile L. alexandri.

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Section: Discussionsupporting

confidence: 91%

An external tag for fish: tagging effects in different fish size classes and its influence on growth performance and hematology of Lophiosilurus alexandri (Siluriformes: Pseudopimelodidae)

Boaventura

Gil

Gil³

et al. 2019

Neotrop. ichthyol.

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“…The fish was then transferred to a 2‐L hapa net (polyethylene, 2 mm mesh) within the tank itself to prevent it from fertilizing females. A total of 112 fish were euthanized after the 150 days of the experiment using 285 mg/L eugenol solution (Mattioli et al, ) for macroscopic evaluation to confirm sex and to calculate the sex ratio.…”

Section: Methodsmentioning

confidence: 99%

“…The presence of larvae was assessed during feedings (8:00 a.m., 12:00 a.m. and 4:00 p.m.), when they were counted and, along with the breeding females, they were measured (Starret digital caliper, 0.01 mm) and weighed (Mars digital scale, 0.001 g). The fish used were euthanized after the breeding period using 285 mg/L eugenol solution (Mattioli et al, ), placed in Bouin solution for 12 hr and then stored in 70% alcohol. A magnifying glass was used to visualize the gonads and verify if embryos were present.…”

Section: Methodsmentioning

confidence: 99%

“…Environmental salinity is known to act directly on several physiological mechanisms of fish, influencing excretion, tolerance to intoxication by nitrogenous compounds (Altinok & Grizzle, ), enzymatic activity (Wang, Lui, Po, & Fan, ) and food conversion (Altinok & Grizzle, ; Luz, Martínez‐Álvarez, De Pedro, & Delgado, ; Mattioli et al, ). Salinity may also cause changes in reproductive performance (Haddy & Pankhurst, ) and variation in sex ratio within a group of fish (Saillant, Fostier, Haffray, Menu, & Chatain, ).…”

Section: Introductionmentioning

confidence: 99%

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Effects of salinity on sexual maturity and reproduction of Poecilia velifera

et al. 2019

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Poecilia velifera is a popular fish in freshwater aquarism that naturally inhabits aquatic habitats with a wide range of salinities. Nonetheless, the effects of different salinities on the reproductive success and sex ratio of the species remain unknown. Male sex characters, sex ratio and reproductive success of P. velifera were evaluated by maintaining 160 juveniles (0.078 ± 0.011 g) in four different salinities (0; 12; 24; 36 g/L), with four replicates. The only modification observed in males was the formation of a copulatory organ from the anal fin, which was used to distinguish them from females. Timing of the formation of the male copulatory organ, and the weight and total length of males when it occurred, were recorded. Twenty‐eight fish from each treatment were euthanized after 150 day to examine the gonads and confirm sex. Eight females and four males from each treatment were then kept in their respective salinity treatments for 65 days to examine the effects of salinity on reproduction. Males were kept with females in the different treatments for 15 days, at which point they were removed. Salinity was negatively correlated with male weight and length. Salinity also affected the sex ratio, with the percentages of males and females being 32.5 and 67.5%, and 27.5 and 72.5% in the salinities of 24 and 36 g of salt/L, respectively. Fifty percent of the females kept in freshwater reproduced, while there was no reproduction in the other treatments. The maintenance of P. velifera in freshwater promoted greater reproductive success and precocity, as well as larger males.

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“…Walaupun tidak ada pemberian pakan selama penampungan, pada salinitas 6 g/L penurunan biomassa tidak sebanyak pada salinitas 0 g/L, hal ini disebabkan karena tekanan osmotik antara lingkungan dan tubuh belut hampir sama sehingga pemanfaatan cadangan energi untuk osmoregulasi lebih sedikit. Sejalan dengan hasil penelitian Mattioli et al (2017) yang menunjukkan bahwa salinitas dapat meningkatkan kinerja produksi ikan lele. Faktor yang menjadi penentu bagi pembudidaya dalam mengadopsi suatu teknologi adalah tingkat produktivitas dan biaya produksi.…”

Section: Hasil Dan Bahasan Analisis Penggunaan Garamunclassified

Efektivitas Salinitas Air Dalam Meningkatkan Sintasan Belut Monopterus Albus Dan Pengaruhnya Terhadap Profitabilitas Penjualan Belut Hidup

Diatin

Hadiroseyani

Astuti

2019

Jurnal Riset Akuakultur

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Belut (Monopterus albus) merupakan ikan air tawar konsumsi hasil tangkapan dari perairan umum yang dijual dalam keadaan hidup dengan harga tinggi dan permintaan yang terus meningkat. Aktivitas penangkapan, transportasi, dan penampungan menimbulkan kematian yang cukup banyak sehingga mengurangi stok dan nilai penerimaan penjualan belut. Penanganan belut pasca-penangkapan dalam air salin dapat menekan tingkat kematian belut, namun dampaknya terhadap keuntungan bisnis belum diketahui. Penelitian ini bertujuan untuk mengevaluasi penampungan dalam air salin terhadap sintasan dan keuntungan usaha penjualan belut hidup. Penelitian dilakukan pada pedagang besar belut hidup di Jawa Tengah yang memperoleh pasokan belut dari berbagai lokasi di Jawa. Belut uji yang diperoleh dari tiga lokasi yaitu Ciamis, Jawa Barat; Cilacap, Jawa Tengah; dan Lumajang, Jawa Timur; masing-masing ditampung terpisah dan dipelihara selama enam hari dalam air tawar (salinitas 0 g/L) dan air tawar yang ditambah garam krosok pada konsentrasi 6 g/L. Hasil menunjukkan bahwa penampungan selama seminggu dalam salinitas 6 g/L menghasilkan tingkat sintasan belut 1,6 kali dibandingkan dengan penampungan dalam air tawar pada semua lokasi asal belut. Sintasan yang lebih tinggi tersebut meningkatkan nilai penerimaan dan keuntungan usaha.Asian swamp eel (Monopterus albus) is a highly-priced freshwater fish collected from natural waters and sold alive in the market with an ever-increasing demand. Fishing methods, transportation, and holding of live eels before being sold frequently result in significant mortality, which eventually reduces the sales revenue from the business. However, post-capture handling of the eel using saline water could reduce the mortality rate, but the impact on business profits has never been determined. This study was aimed to determine the effects of water salinity on the survival of the eels during the holding period and calculate the profit gain from live eel sales. The research was carried out in the facility of a wholesaler of live Asian swamp eel in Central Java which received eel supply from various locations in Java. The samples of eels were originated from three locations, namely Ciamis, West Java; Cilacap, Central Java; and Lumajang, East Java. The eels were placed in separate containers filled with: fresh water (salinity 0 g/L) and freshwater added with salt at concentration 6 g/L for six days. The results showed that six days holding period in salinity of 6 g/L resulted in a higher survival rate of the eels up to 1.6 times compared to the freshwater. This higher survival has increased the revenues and profitability of the live eels sales.

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The effects of acute and chronic exposure to water salinity on juveniles of the carnivorous freshwater catfish Lophiosilurus alexandri

Cited by 49 publications

References 65 publications

An external tag for fish: tagging effects in different fish size classes and its influence on growth performance and hematology of Lophiosilurus alexandri (Siluriformes: Pseudopimelodidae)

An external tag for fish: tagging effects in different fish size classes and its influence on growth performance and hematology of Lophiosilurus alexandri (Siluriformes: Pseudopimelodidae)

Effects of salinity on sexual maturity and reproduction of Poecilia velifera

Efektivitas Salinitas Air Dalam Meningkatkan Sintasan Belut Monopterus Albus Dan Pengaruhnya Terhadap Profitabilitas Penjualan Belut Hidup

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