Abstract
The striped snakehead (Channa striata Bloch, 1793) is a commercially important fish in Lake Rawa Pening, central Java, Indonesia. This study aims were to investigate their age, growth, and recruitment pattern, through a sampling that was performed monthly, from November 2017 to August 2018. The individual fish was measured for length and weight, and sex was determined. The otoliths were collected, cleaned, and placed on molds to pour epoxy resin. The otoliths were cut to obtain slices and observed under a microscope at 100 × magnification. Subsequently, the age was determined by counting the number of daily rings. It was established that the snakehead spawned every month, with a comparably higher frequency in the new moon than in other phases, and mostly were 3–10 months old, characterized by bigger and older sizes during the rainy season. Furthermore, the average growth rate was observed to be faster during the rainy season in contrast with the dry season. Hence, the parameters of von Bertalanffy growth functions were estimated by back-calculated length, and the pattern in female was Lt = 56.09 (1 − e− 0.81 (t + 0.07)), while male Lt = 59.36 (1 − e− 0.71 (t + 0.09)), and total Lt = 60.32 (1 − e− 0.71 (t + 0.14)), respectively.
Highlights
The striped snakehead (Channa striata Bloch, 1793) is a commercially important freshwater fish, found in a variety of habitats, encompassing swamp, rivers, streams, and a lake in southeast Asia, middle east and Africa[1]
The fishing process is performed almost throughout the year, using various types of gears, including fishing rods, traps, spears, bamboo slats fence, as well as circular and lift nets. Their population in Lake Rawa Pening was observed to have been influenced by some factors, including the number of recruits, growth rate, fishing pressure, and natural deaths due to disease, predation, starvation, or old age
There is high fishing pressure on snakeheads found in the waters of Lake Rawa Pening, and the estimated number caught was about 360 tons/year
Summary
The striped snakehead (Channa striata Bloch, 1793) is a commercially important freshwater fish, found in a variety of habitats, encompassing swamp, rivers, streams, and a lake in southeast Asia, middle east and Africa[1]. Channa striata are locally known as ikan gabus, belonging to the family Channidae[2], which prey on fish, crustacean, and g astropod[3] It is one of the promising freshwater species for both semi-intensive and intensive cultures in South East A sia[4], including Indonesia, with its discovery in Lake Rawa Pening. The fishing process is performed almost throughout the year, using various types of gears, including fishing rods, traps, spears, bamboo slats fence (local name = widik), as well as circular and lift nets Their population in Lake Rawa Pening was observed to have been influenced by some factors, including the number of recruits, growth rate, fishing pressure, and natural deaths due to disease, predation, starvation, or old age. The aim of this study, was to examine the growth rate and spawning pattern of snakehead more comprehensively in Lake Rawa Pening, to enable the use of the result as a basis for its resource management
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