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Process, the Size of the First Ripe Gonads and Spawning Season

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Process, the Size of the First Ripe Gonads and Spawning Season CONDITION FACTOR GIANT FEATHERBACKS lChitala lopis BLEEKER 1851) FROA{ KAMPAR RIVER, RIAU Arif Wibowo and Dwi Atminario' ABSTRACT Kampar River is on important hobitot for Giont Featherback (Chitoto Lopis) in Riau Province, because Kampor River has a variety of habitat types for Giant Featherback : main rivers, creek, reservoir and swamp. Fish sompling for onolpis of fish condition factor done every three months in 20A9, in lvlay, August and November representing the dry season $nay and August) and rairry season (November). Factor analysis for the study conditions Giant Featherboclcs totol fish cought during the study, a total of 507 toils. Sizes distributions of fish belida were small size (401-610 mm), medium (611-750 mm) and large (750-950 mm) wos found at each nmpling stotion. Female fish condition foctor was higher than in the grwp of male fish belida medium ond large (> 610 cm). Fish codition factar values in the group sizes were olmost alwoys highest Giant Feotherbacks both male ond femote fish during the dry seoson, transitional ond rain. The anolpis of fish condition factor Giant Featherbacks by size in the standardizotion, informed that the value of the highest condition factor contained in the transitional seasons. Teso Stotion shows the value of the highest condition foctor of fish both males and females and the condition factor value anolysis, regordless of sex. Fish condition foctor values increose with ircreosing TKG, Wrticulorly in fistt femol*. ln mole fislt this tred is not visible. Fislt codition factor values vory in a voriety of sizes bosed on station. However, there is a tendency on the group size was almost alt stations have the highest state value. Fish condition factor volues wry in different seasor,s based on the station- Yolue of fish condition foctor wos highest in TKG lV ot olmost every station. Keywords: Chitalo lopis, giant featherback, condition factor, Kampor River, Riou. INTRODUCTION described by Adjie and Utomo (1994), Adjie dkk. (1999) and Mbowo dkk. Kampar River is an important (2010). habitat for Giant featherback (Chitala Atthough the Kampar River is Lopis'1in Riau Province, this is because an important habitat for fish production in addition to the Kampar River has a Giant Featherback, but there is a large variety of habitat types in the form of gap of information about it. ln this Giant Featherback main rivers, creek, pdp€r, we studied the characteristics of reservoir and swamp atso have a big fish reproduction Giant Featherback annual production. Giant featherback Kampar River, including the maturation productio;r in 2007 in the Kampar River, process, the size of the first ripe reported.l 0 tons (Diskantut, 2008). gonads and spawning season. ln this context, fish adaptation Ftuctuations picture is atso discussed in in terms of reprod,uctive strategies in the context of reproductive ptasticity the areas of geography, with changes in of Giant Featherback tactics in environmenta[ factors of physics, response to varying environmental. chemistry . and biotogy happened. Naturalty occurring fish reproductive Ir^ATERIALS AND METHODS strategies dynamics throughout the 1. Fish Sampling year that are not onty inftuenced but Fish sampting for anatysis of atso the geographic lmation in the fish condition factor and reproductive Kampar River fish, so the reproductive Giant Featherback done every three patterns of Chitola lopis Kampar River months in 2009 that in liay, August and witt be different as it has been 1 Research ltutitute for tnland Fisheries Jalan Berirryin l{o. N lkriam fulembang 9tmatera Selatan Proceeding of lntemational Conferene on lndanesian lnland Waters lll Suppfting PaWr$ November representing the dry season The total length of fish (May dan August) and rainy season obtained from measurements of the (November). ln 2010 performed the fish's body length from the tip of the sampte cottection every month from mouth to the tip of the tait fin using a February to November 2010. Fish ruter to the nearest 1 mm. Weight of sampting conducted at five sampling fish obtained from weighirig the weight stations using hook, lukah, scoop net of fish in whote condition of the body and net assisted by locat fishermen. - that uses weights to the nearest 1 Observations of fish condition gram. Furthermore, the fish, factor and reproductive Giant immediatety dissected to see gender Featherback conducted at five sampling and [eve[ of maturity gonad. The stations in the Kampar River Riau gonads were taken, separated between province, namety: the male gonads and female fish gonads Station l: Kutopanjang Reservoir and preserved with formatin 5%, and (coordinat 00019'5.39" LU, then the gonads were anatyzed in the 1OOo44'3.79' BT). The station is a [aboratory. station tocated in Kampar Kanan river Gonads that have been (upstream) water reservoir that has preserved with formatin dried with a type. The site chosen was the area tissue, then weighed using digital. scales around the batu bersurat. gonad weight to the nearest gram Station ll: Teso (coordinat 00003'2.34' 0.005. The gonads to be observed LU, 101023',2.7f grl. Creek of Kampar fecundity and egg diameter is gonad Kiri river's, station is tocated on the has TKG lll and lV. Gonad maturity [eve[ Kampar Kiri River, the upper reaches of Giant Featherback morphotogicalty for the Kampar River. mate and femate fish were anatlzed by Station lll: Langgam (coordinat modified Cassie (Effendie, 1992) (Tabte ooo15'4.69" LU, 101042',4.55" BT). 1). Giant fetherback gonad maturity Located on middte of Kampar River, a [evets described by direct observation meeting betwebn Kampar Kiri River and with reference to the teve[ of maturity Kampar Kanan River. of the gonads appropriate modifications Station lV: Rantau Baru (coordinat Cassie (Effendie, 1992r. Determination 0a017'1.06' LU, 1a1o4g'1.22" BT). The of fecundity is done by taking the station is located on the main Kampar anterior, middte and posterior female River, in the middte of the zone near fish gonads. Gonad sampte is weighed, the downstream. Rantau Bdru has and then counted the number of eggs affected tides. that exist in gonadal example. For the Station V: Kuata Totam (coordinat measurement of the diameter of the ooolg'3.10" LU, 1azofi'2.6a" BT). eggs is done by taking the exampte 100 Kuata Totam a research station located points each fish, then using a on the Kampar River downstream zone. micrometer eyepiece and objective and Aquatic vegetation Kuata Totam has then measured its diameter. many edges with the acidic waters. 182 Prrceeding of lntemational Conference on lndanesian lnland Waters lll Supprting Papers Tabte 1. Gonad maturity levet of fish (structur morfo-anatomis) modified by Cassie 1 thread, length up to Testis the front of the body cavity. (timited) and visible edges Ctear cotors. smooth. dirongga body. Ctear colors Greater ovary size. Cotor darker Larger testes size. White as mitk. yettowish. Eggs are not ctearly Eggs more clearty than the I visible with the eye. Ovari yetlow, Morphotogicatty egg The surface of the testis were eggs begin to took with the eyes ragged. More white cotor, the greater the testes. Preserved in a state easity broken. Greater ovary, egg yettow, easity As in tevel tll appear more separated. Grain oil is not ctearty. Testis increasingty sotid. visible, fitt 1/2 - 2/3 of the abdominat , bowel 2. Condition Factor Analysis Featherback; smatl size (401-610 mm), The condition factor (K) was medium (611-750 mm) and targe (750- catculated based on the length and 950 mm) were found at each sampting weight of fish samptes. lf the vatue of b station. Anatysis of catches Giant - 3 (isometric growth), then the Featherback by the time of the study, condition factor (KfL) is catcutated differentiated according to the dry using the fottowing formuta (Effendie, season (Aprit, May, June, Juty), transition (February, March, August, losw September) and rainy season (October, Kr.= November, December, January) based I: data flow station. White fish Where: on sampted for reproduction, as many as = Condition factor K 176 taits. W = Body Weight (gram) - Body Length(mm) L 2. Factor Condition Analysis However, b * 3 (growth is if factor bv sex attometrik), the condition factor (Kn) Fish condition factor shows the carculated or,f t:V, state both in terms of physicat capacity " for survival and reproduction (Effendie, aI] 20021, and atso to determine and Where: compare the suitabitity of habitat for lG = Retative condition factor of fish environment indirectty. Value each fish femate fish condition factor (0.857) was W = Body Weight (gram) stightl.y higher than mate fish giant i, b = Constanta featherback (0.848) (Figure 1). This is L - Totat length (mm) because the gonads contribute to the vatue of condition factor, gonad RESULTS containing eggs larger than the gonad 1. Cathes Giant Featherback containing sperm. This is consistent For anatysis of condition factor with the statement Effendie (1997) that during the study Giant featherback one of the causes of the condition are totat fish caught during the study, a factors that affect the levet of gonad total of 507 taits. Att sizes of fish Giant maturity. Giant Featherback condition 183 Prxeeding of lntemational @nferene on lndonesian lnland Waters lll Suppofting Papers factor of females larger than mates (19991 in the River Batanghari Jambi belida fish atso reported by Adiie et al. Province. 0.858 0.856 0.854 _o o.asz !o x 0.85 .l E 0.8,18 *6 0.846 0.844 0.u2 Jantan (n=267) Betina (n=240) Jenis Kelamin Figure 1. Giant featherback condition factor by sex. condition factor was higher than in the bv sex and size group of mate fish medium and large (> Contributions gonad increase 610) (Figure 2). Giant featherback fish the value of condition factor, visibte in this size group atready has eggs so as when comparing the size and condition to provide increased performance and factor sexes.
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