Length-weight relationship of mudskippers (Gobiidae: Oxudercinae) in the coastal areas of Selangor, Malaysia

Parameters a and b of the length-weight relationship (LWR) were estimated for eleven species of mudskippers caught in the coastal areas of Selangor, Malaysia. The values of b ranged from 2.56 to 3.50 with the mean b equal to 2.95 (n=11; sd=0.302). A normal distribution of the calculated LWR exponent (b) was obtained

Length-weight relationship of mudskippers (Gobiidae: Oxudercinae) in the coastal areas of Selangor, Malaysia

Parameters a and b of the length-weight relationship (LWR) were estimated for eleven species of mudskippers caught in the coastal areas of Selangor, Malaysia. The values of b ranged from 2.56 to 3.50 with the mean b equal to 2.95 (n=11; sd=0.302). A normal distribution of the calculated LWR exponent (b) was obtained.Length-weight relationships, Euryhalinity, Coastal waters, Malaysia, Selangor, Oxudercinae

Length-weight relationships, condition factor and growth parameters of Periophthalmus chrysospilos (Bleeker, 1852) (Gobiiformes: Gobiidae) in Bayan Bay, Penang, Malaysia

This study reports the length-weight relationships (LWR), body condition factor (Kn) and growth parameters of Periophthalmus chrysospilos in Bayan Bay of Penang, Malaysia. The values of exponent b for all categories of fish were higher than 3 indicating a positive allometric growth. The mean condition factor (Kn) for all categories of fish also higher than 1 which reflect the well beings of fish in the study area. The b values of LWR and condition factors for male was similar to female fish, but the b values of LWR and condition factors were significantly higher in rainy months compared to the dry months. The parameters of population dynamic show the asymptotic length (L∞) of 13.20 cm, growth coefficient (K) of 0.68 year-1, growth performance index (Ø’) of 2.074, total mortality (Z) of 2.47 year-1, and fishing mortality (F) of 0.70 year-1. The exploitation level (E) was 0.28 year-1 indicating of low exploitation and estimation of length at first capture was 7.69 cm. The annual recruitment pattern of P. chrysospilos was recruited in two peaks per year

An annotated checklist of fish fauna of Bukit Merah Reservoir and its catchment area, Perak, Malaysia

The fish fauna was surveyed at Bukit Merah Reservoir of Perak (one of the oldest reservoir in Peninsular Malaysia) and its catchment areas. A total of 47 species from 19 families were recorded: 38 fish species were recorded from eight sampling stations located in selected tributaries (lotic zone), while another 25 fish species were recorded in the reservoir itself (lentic zone). Based on a combination of previously published checklists and the present survey, a total of 76 fish species were recorded at Bukit Merah Reservoir. Out of these species, 25 fish species from this survey were new records. Most of the new records were found in the catchment area of the river basin. The presence of two alien species, Oreochromis niloticus and Clarias gariepinus, should be noted as these species could affect the population of native species

A preliminary checklist of fish species in the peat swamp forest of Ayer Hitam Utara State Park Forest, Johor, Malaysia

Ayer Hitam Utara State Park Forest (AHUSPF) is an invaluable sanctuary in Johor, the last remaining intact peat swamp forest reserve that hosts many species unique to this distinctive habitat. Some rapid surveys conducted from 2019 to 2022 recorded 40 species of freshwater fish within AHUSPF. Notably, 11 are stenotopic to acid blackwater, and 12 are stenotopic to acid water, most belonging to the family Osphronemidae and Danionidae. The International Union for Conservation of Nature Red List has designated two species, Encheloclarias curtisoma and Betta persephone, as Endangered, while Betta omega is classified as Critically Endangered. The checklist presented herein was first produced from an inventory study in AHUSPF. The preservation of peat swamp forests in the area is under imminent threat due to the alarming rate of land conversion, forest fires, and the recent potential threat from the red-claw crayfish invasion in the aquatic environment. Hence, continuous monitoring is vital for documenting and updating the conservation status of the fish species. These endeavours will facilitate the development of practical conservation approaches to ensure the long-term sustainability of AHUSPF and its associated species

Aquatic-terrestrial transitions of feeding systems in vertebrates : a mechanical perspective

Transitions to terrestrial environments confront ancestrally aquatic animals with several mechanical and physiological problems owing to the different physical properties of water and air. As aquatic feeders generally make use of flows of water relative to the head to capture, transport and swallow food, it follows that morphological and behavioral changes were inevitably needed for the aquatic animals to successfully perform these functions on land. Here, we summarize the mechanical requirements of successful aquatic-to-terrestrial transitions in food capture, transport and swallowing by vertebrates and review how different taxa managed to fulfill these requirements. Amphibious ray-finned fishes show a variety of strategies to stably lift the anterior trunk, as well as to grab ground-based food with their jaws. However, they still need to return to the water for the intra-oral transport and swallowing process. Using the same mechanical perspective, the potential capabilities of some of the earliest tetrapods to perform terrestrial feeding are evaluated. Within tetrapods, the appearance of a mobile neck and a muscular and movable tongue can safely be regarded as key factors in the colonization of land away from amphibious habitats. Comparative studies on taxa including salamanders, which change from aquatic feeders as larvae to terrestrial feeders as adults, illustrate remodeling patterns in the hyobranchial system that can be linked to its drastic change in function during feeding. Yet, the precise evolutionary history in form and function of the hyolingual system leading to the origin(s) of a muscular and adhesive tongue remains unknown

A new record of the Mudskipper Parapocryptes serperaster (Oxudercinae: Gobiidae) from peninsular Malaysia.

Species of the gobiid fishes that are commonly known as musskippers abound on the mudflas of Selangor coasts. The material examined is deposited at the Institute of Biological Sciences, University of Malaya and identified by using the key of Koumans and Murdy. One of the specimen of mudskipper Parapocryptes serperaster, a new record for Peninsular Malaysia was captured at Sungai Sembilang, Jeram, Selangor. Its morphological features and habitat utilization are discussed. The preliminary feeding habit is described based on their gu contents

Effects of freezing on sperm velocity in four different age groups of jermasia buck

The present study was undertaken to investigate the effects of freezing on sperm velocity in four different age groups (young: <1 year; mature: e <= 1.0-2.5 years; old: e <= 2.5-4.5 years and very old: e <= 4.5 years) of Jermasia buck. Tris Citric Acid Egg Yolk Extender (TCAYE) was added to semen samples and cryopreserved using a programmable freezer prior to plunging into liquid nitrogen (-196 degrees C). The fresh extended and frozen-thawed semen were subjected to computer automated semen analyzer (CASA) for sperm velocity evaluation. Fresh extended sperm in mature age group showed significantly highest values for average path velocity (VAP) 76.73 +/- 1.24 mu m/s, straight line velocity (VSL) 55.30 +/- 1.05 mu m/s, curvilinear velocity (VCL) 144.31 +/- 2.38 mu m/s, amplitude of lateral head displacement (ALH) 6.59 +/- 0.10 mu m and beat cross frequency (BCF) 39.59 +/- 0.36Hz as compared to young, old and very old age groups of buck (P<0.05). Significantly (P<0.05) higher values for VAP, VSL, VCL and ALH were observed in fresh as compared to frozen-thawed sperm in all age groups of buck. Thus, age of bucks should be considered as one of the factors that contribute to better sperm velocity which might affect fertilizability of the sperm. Optimizing the freezing technique is also essential in order to obtain satisfactory results after artificial insemination

Cyprinid fishes of the genus Neolissochilus in Peninsular Malaysia

Khaironizam, M. Z., Zakaria-Ismail, M., Armbruster, Jonathan W. (2015): Cyprinid fishes of the genus Neolissochilus in Peninsular Malaysia. Zootaxa 3962 (1): 139-157, DOI: http://dx.doi.org/10.11646/zootaxa.3962.1.

Garra cambodgiensis

&lt;i&gt;Garra cambodgiensis&lt;/i&gt; (Tirant 1884) &lt;p&gt; &lt;i&gt;Garra cambodgiensis&lt;/i&gt;: Authors' data (Sg. Ketir).&lt;/p&gt;Published as part of &lt;i&gt;Ng, Casey Keat Chuan, Lim, Teow Yeong, Ahmad, Amirrudin &amp; Khaironizam, Md Zain, 2019, Provisional checklist of freshwater fish diversity and distribution in Perak, Malaysia, and some latest taxonomic concerns, pp. 515-545 in Zootaxa 4567 (3)&lt;/i&gt; on page 523, DOI: 10.11646/zootaxa.4567.3.5, &lt;a href="http://zenodo.org/record/2599047"&gt;http://zenodo.org/record/2599047&lt;/a&gt