Growth, Mortality and Recruitment Patterns of Amblyrhynichthys truncatus (Bleeker) in Paya Bungor, Pahang

This paper attempts to determine the growth, mortality I1nd recruitment patterns of A'mblyrhynichthys uuncatus by using a computer-based methoa for the analysis of length-frequency data (ELEFAN I & II). It is shown that this species has an approximate life span of four years with -the following growth parameters; Loo=29.5cm, K=0.425 and - -0.41989. While natural mortality (M = 1.04) is comparable to other species in the lake, fishing mortality (F - 4.15) and exploitation rates are found to be relatively high. This fish is highly susceptible to trammel nets with full retention occurring at 18cm length while the mean length at first capture is 17.8cm. There appears to be a single recruitment season with a peak in January

DISTRIBUTION AND ABUNDANCE OF BENTHIC POLYCHAETES AROUND ARTIFICIAL REEFS

A study wns conducted in coastal waters off the east coast of Peninsular Malaysia to deternrine the distribrrtion and abundance of polychaetes around an artificial reef complex

Fisheries and the National Food Security: the Malaysian perspective

Fisheries constitute one of nature’s renewable, highly diverse and dynamic agricultural resources. These resources exist in an aquatic environment that are subjected to an ever increasing degradation, notably pollution. They represent an extremely valuable commodity,much sought after for food, ornaments and recreational purpose. Food is a very important and sensitive topic, especially when a substantial amount of our requirement is produced by others (imported). Shortage of food is detrimental and can create unrest in the country. One of the greatest challenges in the new millenium is to meet the demand for safe and nutritious food for our growing population

Monitoring Population Parameters for Fisheries Management: I. Species Composition, Abundance and Distribution Patterns of Fishes in Paya Bungor

A one year direct monitoring study offish populations was conducted in Paya Bungor. The lake comprised 12 families and 43 species of freshwater fishes. The cyprinids dominated the fish community, contributing to about 54% followed by the catfishes (16%). More species were recorded in the northern part of the lake. Riverzne species accounted for more than 80% of the species composition in Paya Bungor. A high percentage of predatory species (49%) was also observed. Amblyrhynchichthys truncatus was the most abundant species (33%) followed by Thynnichthys thynnoides (20%) and Puntius schwanenfeldii (18%). Together with 12 other cyprinids, they made up more than 90% of the total catch. Catfishes, comprising 7 species constituted only 1.4%. The general pattern of seasonal abundance indicate that more fishes are found in the months of January, March, June and September while less fish occur in the months of February, May, August and September. This pattern zs relat.ed tv fluctuations in water levels, WL, water temperature, T, and conductivity, C, as exemplified by the equation: Population abundance, p = -886 + 135 WL + 23.77 T - 0.151 C. The heterogenous fish population in Paya Bungor exhibit spatial and temporal patterns of distribution. The species in Paya Bungor are log-normally distributed with the distribution curve as follows: . 2 S(R) = 5.366 exp -(0.365

Night-time movement of fish in coastal waters of Terengganu

The night-time movement pattern of 15 fish species in Terengganu waters was inferred from the driftnet catch obtained from experimental driftnetting in two monsoon seasons. Nets shot perpendicular to the coast drifted northward or southward parallel to the coast at 0.33-1. 78 km/h. Thirteen out of 15 species caught were enmeshed significantly against the current. Observations on gonad development of some migratory pelagic species showed that these species were on spawning migration to nearl7y known spawning areas. Daytime and long-term movement patterns remain unknown

Rainfall in Sarawak

Objektif utama manuskrip ini adalah untuk memahami, dalam konteks bulanan, keamatan taburan hujan dan taburan hari hujan di negeri Sarawak. Keputusan kami menunjukkan bahawa: (a) tiada korolasi jelas antara jumlah hari hujan (keamatan taburan hujan) dengan jumlah keseluruhan taburan hujan yang dicatatkan, dan (b) keputusan keamatan taburan hujan adalah tidak berpasangan dengan keputusan untuk jumlah hari hujan

Population Study, Length-weight Relationship, Size and Movement of Acrossocheilus Deauratus (euvier & Valenciennes) in Two Malaysian Streams

A survey of the population estimation of'ikan daun' (Acrossocheilus deauratus) on Sungai Batu and Sungai Tua in Selangor, Malaysia was done. A small stretch of 1.5 km each in Sungai Batu and Sungai Tua represented 3,969 and 1,932 'ikan daun' respectively. The length of the fishes varies from 53-115 mm and the length-weight relationship was represented by the formulae: Sungai Batu, Loge W = Log e 0.0006 + 2.2956 Log e L, and Sungai TZ!a, Loge W = Loge 0.0001 + 2.7003 Loge L. Ecological conditions in Sungai Batu were favourable for the 'ikan daun' population. There is no evidence of shoal movements occurring in these two streams but some individual movement did occur

Growth Characteristics of Lizard Fish (Fam: Synodontidae) in the South China Sea

A study of growth characteristics of synodontids of Malaysia was carried out in waters within the Exclusive Economic Zone, South China Sea. Five age groups were identified for Saurida tumbil and four for S. undosquamis. Growth parameters of the von Bertalanffy equation for the two species are presented