Growth patterns and condition factors of fish in the Celike River, leuser ecosystem area, East Aceh, Indonesia

<p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" class="first" dir="auto" id="d3799086e129">Fish growth patterns are the process of increasing the size and weight of a fish's body that occurs during its lifetime. This growth pattern is influenced by genetic factors, the environment, food availability and the physiological condition of the fish. Research on Growth Patterns and Condition Factors of Fish in the Celike River in the Leuser Ecosystem Area of East Aceh aims to determine the size of fish and provide an overview of fish growth patterns by analyzing the relationship between length and weight and fish condition factors. The method used is a purposive sampling method, namely determining the location of research station based on consideration of habitat characteristics in locations that are thought to have a high presence of fish, are easy to reach and represent the Celike River area in the Leuser Ecosystem Area. This research was carried out in July 2024. The total number of fish obtained was 122 individuals from 10 species belonging to seven families, namely Cyprinidae, Sisoridae, Clariidae, Channidae, Cichlidae, Balitoridae, Aplocheilus. There are two dominant species caught at this location, namely <i>Tor soro</i> and <i>Tor tambra</i>. <i>Tor tambra</i> obtained during the study amounted to 40 individuals with a total length of 70.09 - 434.4 mm and a weight of 3.96 - 811.05 g. <i>Tor soro</i>) obtained during the study amounted to 34 individuals with a total length of 61.79 - 144.33 mm and a weight of 2.89 - 32.5 g. The growth pattern of fish in the Celike River with eight fish species is negative allometric, two fish species are isometric and positive allometric, with condition factor values ranging from 0.07 to 8.88. </p>

Ecosystem model - Wikipedia

Ecosystem model - Wikipedia

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Electrotrawling can improve the sustainability of the bottom trawl fishery for sole: a review of the evidence - Reviews in Fish Biology and Fisheries

Between 2009 and 2021 almost the complete beam trawl fleet of the Netherlands switched from conventional beam trawls (BT) to pulse trawls (PT) using electrical stimulation to catch sole, Solea solea. Electric fishing, being banned in the EU in 1988, was made possible in 2006 under a derogation. Over the years stakeholders expressed concern about ecosystem effects. Here we review the research conducted. PT improved the selectivity of the fishery and reduced the ecological side effects. PT caught more sole per hour fishing but less discards and benthos than BT. The transition to PT reduced the surface area swept (lower towing speed), sediment depth of disturbance and associated benthic impacts, as well as fuel consumption. Laboratory experiments with 9 fish and 17 benthic invertebrate species showed that exposure to a commercial bipolar pulse stimulus did not result in harmful effects except in cod. Autopsy of cod sampled from PT revealed that 40% had an internal injury. Injury rates in other roundfish species was low (< 2%) and absent in flatfish. Electrical-induced impacts on biogeochemistry were not observed. The transition increased competition with other fishers which fed the resentment against PT. Governance arrangements under which the number of temporary licenses expanded, undermined legitimacy of the gear, resulting in a ban in 2021. Although questions about the ecological impact of electrical stimulation remain, adverse effects are considered negligible in comparison with the benefits.

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