scholarly journals Risking lives for living: a study on underwater fishing in the Padma River, Bangladesh

2017 ◽  
Vol 5 (3) ◽  
pp. 525
Author(s):  
Md. Taskin Parvez ◽  
ABM Mohsin ◽  
Nipa Chaki ◽  
Shams M. Galib
Keyword(s):  
Fish Species ◽  
Water Depth ◽  
Freshwater Prawn ◽  
Health Issues ◽  
Padma River ◽  
Sperata Seenghala

A variety of methods and gears are being employed across the globe including Bangladesh. This study describes the underwater fishing method in the Padma River- one of the three largest rivers in Bangladesh. Standardised efforts have been made for collecting data of interest between September 2016 and May 2017. Two types of underwater fishing, with or without using oxygen cylinders, were recorded. Mean duration of fishing per effort was higher (by 382%) when fishermen used oxygen cylinders. Mean water depth of fishing sites was also higher when oxygen cylinders were used. Three species of finfish (Rita rita, Sperata seenghala and Labeo calbasu) and one freshwater prawn species (Macrobrachium dayanum) have been identified in the catch. The catch was dominated by M. dayanum in both fishing types (27 ± 9.3 [with oxygen] and 15 ± 5.2 [without oxygen]). However, all the number of caught fish species varied significantly among different sampling months in both fishing methods (P < 0.001) except L. calbasu in fishing with oxygen cylinder. A number of health issues of the fishermen were also recorded.

scholarly journals A Survey On Marine Fish Species In River of Mahakam East Kalimantan, Indonesia

Omni-Akuatika ◽  
2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Iwan Suyatna ◽  
Muhammad Syahrir ◽  
Mislan Mislan ◽  
Yuni Irawati Wijaya ◽  
Abdunnur Abdunnur
Keyword(s):  
Marine Fish ◽  
Fish Species ◽  
Water Depth ◽  
Fish Community ◽  
Marine Species ◽  
Demersal Fish ◽  
Middle Part ◽  
Marine Fish Species ◽  
East Kalimantan ◽  
Velocity Water

A first survey  on a community marine species in  river of Mahakam East Kalimantan was performed in December 2015 and May 2016. Fish samplings were carried out from two locations the lower and the middle part of Mahakam. Whilst hydrometric observation of current velocity, water depth and tide was measured not only at the locations but also along the river from 2013 to 2017, tide was only observed in the lower part of Mahakam.  However, marine fish species were recognized to reach up the middle part of Mahakam, 230 km from coastline.  To describe a community fish structure and its dissimilarity of the two surveyed locations, diversity and bray Curtis index were applied.  Almost 15 marine fish species identified in river of Mahakam was demersal fish and index of the similarity of marine fish community between the locations only 0.106.

scholarly journals Fossil glochidia (Bivalvia, Unionidae): identification and value in palaeoenvironmental reconstructions

1998 ◽  
Vol 17 (2) ◽  
pp. 179-182 ◽  
Author(s):  
David C. Aldridge ◽  
David C. Horne
Keyword(s):  
Fish Species ◽  
Water Depth ◽  
Freshwater Mussels ◽  
Palaeoenvironmental Reconstructions

Abstract. Preserved valves of fossil glochidia have been recovered from Holocene lake marls at Quidenham Mere, UK. Detailed morphological comparisons with glochidia removed from live adult unionids have enabled confident identification of the fossil glochidia as those of Anodonta anatina. Fossil glochidia are potentially powerful tools in the interpretation of palaeoenvironments. Different species of freshwater mussels are known to release glochidia at different times of the year and, therefore, the occurrence of fossil glochidia can provide information on the season during which sediments accumulated. Furthermore, glochidia can provide information on the presence of certain fish species and on water depth.

scholarly journals Effects of depth and season on catch volume of bottom gillnets employed along the Fatsa coasts of the South-eastern Black Sea

2020 ◽  
Vol 37 (2) ◽  
pp. 187-194 ◽  
Author(s):  
İsmet BALIK
Keyword(s):  
Black Sea ◽  
Fish Species ◽  
Water Depth ◽  
Horse Mackerel ◽  
Shallow Waters ◽  
The South ◽  
Summer Period ◽  
South Eastern ◽  
Water Layers ◽  
Merlangius Merlangus

The study was conducted along the Fatsa coasts of the South-eastern Black Sea, to investigate the effects of depth and season on catch volume of the bottom gillnet fishery. During the study, fishing was carried out using multifilament gillnets with mesh sizes of 32, 34, 36 and 38 mm in each of the four different depth strata (0-14 m, 15-29 m, 30-49 m and ≥50 m) three times per month between March 2013 and February 2014 (except for July and August), with a total of 30 gillnet hauls performed. The results of the study revealed that in all seasons whiting (Merlangius merlangus) was caught most in the 30 m and deeper water layers. However, whiting catch increased with increasing water depth. Most red mullets (Mullus barbatus) were caught in the 0-14 m depth waters during spring, winter and autumn periods, while its catch was the greatest in the 15-29 m during the summer period. Catch of this species decreased gradually with increasing water depth. Another fish species was pontic shad (Alosa immaculata) which was caught least in the shallow waters. However, during all seasons its catch increased gradually with increasing water depth up to the 30-49 m depth strata. Nevertheless, it was determined that catch volume for this species decreased in the ≥50 m level again. On the other hand, Mediterranean horse mackerel (Trachurus mediterraneus) was mostly caught in the shallow waters (0-14 m and 15-29 m) during all seasons. Especially in the ≥50 m waters, no Mediterranean horse mackerel was sampled during the study. This study presents that amounts of catch for the fish species sampled were affected especially by water depth and seasons.

Variations in the infection level of Neoergasilus japonicus (Copepoda: Ergasilidae) between freshwater fishes at different sites in the Ashida River system, western Japan

Zoosymposia ◽  
2012 ◽  
Vol 8 (1) ◽  
pp. 106-116 ◽  
Author(s):  
KAZUYA NAGASAWA ◽  
AKIKO INOUE
Keyword(s):  
Fish Species ◽  
Water Depth ◽  
River System ◽  
Freshwater Fishes ◽  
Current Speed ◽  
Main Stream ◽  
Infection Level ◽  
Western Japan ◽  
Native Fishes ◽  
Neoergasilus Japonicus

Females of Neoergasilus japonicus (Harada, 1930) are ectoparasitic on freshwater fishes. While this species is currently known as an alien parasite in southern Asia, Europe, and North America, little information is as yet available on its ecology. In this study, we investigated the occurrence of N. japonicus on freshwater fishes in the Ashida River system in Hiroshima Prefecture, western Japan, in order to evaluate which factors may contribute to variations in the infection level of this parasite between fish species and between sampling locations. Sampling was conducted at five sites in the middle and lower reaches of the Ashida River (the main stream) and at two sites of its tributary, the Takaya River. Twenty-three fish species belonging to seven families were collected, of which ten (eight native and two introduced) benthopelagic species were found infected with N. japonicus. Two centrarchid species of North American origin, largemouth black bass Micropterus salmoides and bluegill Lepomis macrochirus, were more frequently and heavily infected than Japanese native fishes. In both introduced and native fishes, larger individuals showed a higher level of infection. For the fish species that were widespread in the main stream, infection with N. japonicus occurred in the lower reaches only, where current speed was nil and water depth was high. These results suggest that the fish composition, biological aspects (e.g., body size and distribution in the water column) of the fish hosts, and environmental factors such as current speed and water depth are closely associated with the distribution pattern of N. japonicus in the Ashida River system.

scholarly journals LENGTH-WEIGHT RELATIONSHIPS OF EIGHTEEN SPECIES OF FRESHWATER FISHES FROM PANCHET RESERVOIR IN GANGES BASIN, JHARKHAND, INDIA

2020 ◽  
Vol 67 (1) ◽  
Author(s):  
K.M. Sandhya ◽  
Gunjan Karnatak ◽  
Lianthuamluaia ◽  
Uttam Kumar Sarkar ◽  
Suman Kumari ◽  
...  
Keyword(s):  
Fish Species ◽  
Stock Assessment ◽  
Allometric Growth ◽  
Tropical Reservoir ◽  
B Values ◽  
Damodar River ◽  
Damodar River Basin ◽  
River Ganga ◽  
Sperata Seenghala ◽  
Relationship Of

The present study describes the length-weight relationships (LWRs) of 18 fish species from a large tropical reservoir, Panchet, in the Damodar River basin, one of the main tributary of the largest river Ganga in India. A total of 2419 individuals represented by 18 species belonging to 9 families were sampled between November 2014 and June 2016. The b values ranged from 2.469 for Trichogaster chuna to 3.428 for Ailia coila. All the regressions were highly significant (p<0.001). The results revealed positive allometric growth for seven species (b>3, p<0.05), negative allometric growth for seven species (b<3, p<0.05) and isometric growth for four species (b=3, p>0.05). This study represents the first reference on the length-weight relationship of Trichogaster chuna from a reservoir ecosystem. This is the first report on LWRs of five fish species viz., Puntius terio, Pethia conchonius, Sperata seenghala, Ailia coila and Trichogaster chuna from an Indian reservoir. This study provides basic data for future stock assessment studies and management programmes from Panchet Reservoir as well as for complementing the comparisons of LWRs from other ecosystems.

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